// Type definitions for FabricJS v1.5.0
// Project: http://fabricjs.com/
// Definitions by: Oliver Klemencic <https://github.com/oklemencic/>, Joseph Livecchi <https://github.com/joewashear007/>, Michael Randolph <https://github.com/mrand01/>
// Definitions: https://github.com/borisyankov/DefinitelyTyped

/* tslint:disable:no-unused-variable */
/* tslint:disable:whitespace */
/* tslint:disable:typedef */

// Support AMD require
declare module "fabric" {
  export = fabric;
}

declare module fabric {

  var isLikelyNode: boolean;
  var isTouchSupported: boolean;

  /////////////////////////////////////////////////////////////
  // farbic Functions
  /////////////////////////////////////////////////////////////

  function createCanvasForNode(width: number, height: number): ICanvas;

  // Parse
  // ----------------------------------------------------------
  /**
   * Creates markup containing SVG referenced elements like patterns, gradients etc.
   * @param {fabric.Canvas} canvas instance of fabric.Canvas
   */
  function createSVGRefElementsMarkup(canvas: IStaticCanvas): string;
  /**
   * Creates markup containing SVG font faces
   * @param {Array} objects Array of fabric objects
   */
  function createSVGFontFacesMarkup(objects: IObject[]): string;
  /**
   * Takes string corresponding to an SVG document, and parses it into a set of fabric objects
   * @param {String} string
   * @param {Function} callback
   * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.
   */
  function loadSVGFromString(string: string, callback: (results: IObject[], options: any) => void, reviver?: Function): void;
  /**
   * Takes url corresponding to an SVG document, and parses it into a set of fabric objects.
   * Note that SVG is fetched via XMLHttpRequest, so it needs to conform to SOP (Same Origin Policy)
   * @param {String} url
   * @param {Function} callback
   * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.
   */
  function loadSVGFromURL(url: string, callback: (results: IObject[], options: any) => void, reviver?: Function): void;
  /**
   * Returns CSS rules for a given SVG document
   * @param {SVGDocument} doc SVG document to parse
   */
  function getCSSRules(doc: SVGElement): any;

  function parseElements(elements: any[], callback: Function, options: any, reviver?: Function): void;
  /**
   * Parses "points" attribute, returning an array of values
   * @param {String} points points attribute string
   */
  function parsePointsAttribute(points: string): any[];
  /**
   * Parses "style" attribute, retuning an object with values
   * @param {SVGElement} element Element to parse
   */
  function parseStyleAttribute(element: SVGElement): any;
  /**
   * Transforms an array of svg elements to corresponding fabric.* instances
   * @param {Array} elements Array of elements to parse
   * @param {Function} callback Being passed an array of fabric instances (transformed from SVG elements)
   * @param {Object} [options] Options object
   * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.
   */
  function parseElements(elements: any[], callback: Function, options?: any, reviver?: Function): void;
  /**
   * Returns an object of attributes' name/value, given element and an array of attribute names;
   * Parses parent "g" nodes recursively upwards.
   * @param {DOMElement} element Element to parse
   * @param {Array} attributes Array of attributes to parse
   */
  function parseAttributes(elemen: HTMLElement, attributes: string[], svgUid?: string): { [key: string]: string }
  /**
   * Parses an SVG document, returning all of the gradient declarations found in it
   * @param {SVGDocument} doc SVG document to parse
   */
  function getGradientDefs(doc: SVGElement): { [key: string]: any };
  /**
   * Parses a short font declaration, building adding its properties to a style object
   * @param {String} value font declaration
   * @param {Object} oStyle definition
   */
  function parseFontDeclaration(value: string, oStyle: any): void;
  /**
   * Parses an SVG document, converts it to an array of corresponding fabric.* instances and passes them to a callback
   * @param {SVGDocument} doc SVG document to parse
   * @param {Function} callback Callback to call when parsing is finished; It's being passed an array of elements (parsed from a document).
   * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.
   */
  function parseSVGDocument(doc: SVGElement, callback: (results: IObject[], options: any) => void, reviver?: Function): void;
  /**
   * Parses "transform" attribute, returning an array of values
   * @param {String} attributeValue String containing attribute value
   */
  function parseTransformAttribute(attributeValue: string): number[];

  // fabric Log
  // ---------------
  /**
   * Wrapper around `console.log` (when available) 
   */
  function log(...values: any[]): void;
  /**
   * Wrapper around `console.warn` (when available) 
   */
  function warn(...values: any[]): void;

  ////////////////////////////////////////////////////
  // Classes
  ////////////////////////////////////////////////////
  var Canvas: ICanvasStatic;
  var StaticCanvas: IStaticCanvasStatic;

  var Color: IColorStatic;
  var Pattern: IPatternStatic;
  var Intersection: IIntersectionStatic;
  var Point: IPointStatic;

  var Circle: ICircleStatic;
  var Ellipse: IEllipseStatic;
  var Group: IGroupStatic;
  var Image: IImageStatic;
  var Line: ILineStatic;
  var Object: IObjectStatic;
  var Path: IPathStatic;
  var PathGroup: IPathGroupStatic;
  var Polygon: IPolygonStatic;
  var Polyline: IPolylineStatic;
  var Rect: IRectStatic;
  var Shadow: IShadowStatic;
  var Text: ITextStatic;
  var IText: IITextStatic;
  var Triangle: ITriangleStatic;

  var util: IUtil;

  ///////////////////////////////////////////////////////////////////////////////
  // Data Object Interfaces - These intrface are not specific part of fabric, 
  // They are just helpful for for defining function paramters
  //////////////////////////////////////////////////////////////////////////////
  interface IDataURLOptions {
    /**
     * The format of the output image. Either "jpeg" or "png" 
     */
    format?: string;
    /**
     * Quality level (0..1). Only used for jpeg 
     */
    quality?: number;
    /**
     * Multiplier to scale by 
     */
    multiplier?: number;
    /**
     * Cropping left offset. Introduced in v1.2.14 
     */
    left?: number;
    /**
     * Cropping top offset. Introduced in v1.2.14 
     */
    top?: number;
    /**
     * Cropping width. Introduced in v1.2.14 
     */
    width?: number;
    /**
     * Cropping height. Introduced in v1.2.14 
     */
    height?: number;
  }

  interface IEvent {
    e: Event;
    target?: IObject;
  }

  interface IFillOptions {
    /**
     * options.source Pattern source 
     */
    source: string | HTMLImageElement;
    /**
     * Repeat property of a pattern (one of repeat, repeat-x, repeat-y or no-repeat) 
     */
    repeat?: string;
    /**
     * Pattern horizontal offset from object's left/top corner 
     */
    offsetX?: number;
    /**
     * Pattern vertical offset from object's left/top corner  
     */
    offsetY?: number;
  }

  interface IToSVGOptions {
    /**
     * If true xml tag is not included 
     */
    suppressPreamble: boolean;
    /**
     * SVG viewbox object 
     */
    viewBox: IViewBox;
    /**
     * Encoding of SVG output 
     */
    encoding: string;
  }

  interface IViewBox {
    /**
     * x-cooridnate of viewbox 
     */
    x: number;
    /**
     * y-coordinate of viewbox 
     */
    y: number;
    /**
     * Width of viewbox 
     */
    width: number;
    /**
     * Height of viewbox  
     */
    height: number;
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  // Mixins Interfaces 
  //////////////////////////////////////////////////////////////////////////////
  interface ICollection<T> {
    /**
     * Adds objects to collection, then renders canvas (if `renderOnAddRemove` is not `false`)
     * Objects should be instances of (or inherit from) fabric.Object
     * @param {...fabric.Object} object Zero or more fabric instances
     */
    add(...object: IObject[]): T;

    /**
     * Inserts an object into collection at specified index, then renders canvas (if `renderOnAddRemove` is not `false`)
     * An object should be an instance of (or inherit from) fabric.Object
     * @param {Object} object Object to insert
     * @param {Number} index Index to insert object at
     * @param {Boolean} nonSplicing When `true`, no splicing (shifting) of objects occurs
     * @return {Self} thisArg
     * @chainable
     */
    insertAt(object: IObject, index: number, nonSplicing: boolean): T;

    /**
     * Removes objects from a collection, then renders canvas (if `renderOnAddRemove` is not `false`)
     * @param {...fabric.Object} object Zero or more fabric instances
     * @return {Self} thisArg
     * @chainable
     */
    remove(...object: IObject[]): T;

    /**
     * Executes given function for each object in this group
     * @param {Function} callback
     * @param {Object} context Context (aka thisObject)
     * @return {Self} thisArg
     */
    forEachObject(callback: (element: IObject, index: number, array: IObject[]) => any, context?: any): T;

    /**
     * Returns an array of children objects of this instance
     * Type parameter introduced in 1.3.10
     * @param {String} [type] When specified, only objects of this type are returned
     * @return {Array}
     */
    getObjects(type?: string): IObject[];

    /**
     * Returns object at specified index
     * @param {Number} index
     * @return {Self} thisArg
     */
    item(index: number): T;

    /**
     * Returns true if collection contains no objects
     * @return {Boolean} true if collection is empty
     */
    isEmpty(): boolean;

    /**
     * Returns a size of a collection (i.e: length of an array containing its objects)
     * @return {Number} Collection size
     */
    size(): number;

    /**
     * Returns true if collection contains an object
     * @param {Object} object Object to check against
     * @return {Boolean} `true` if collection contains an object
     */
    contains(object: IObject): boolean;

    /**
     * Returns number representation of a collection complexity
     * @return {Number} complexity
     */
    complexity(): number;
  }

  interface IObservable<T> {
    /**
     * Observes specified event
     * @param eventName Event name (eg. 'after:render') 
     * @param handler Function that receives a notification when an event of the specified type occurs
     */
    on(eventName: string, handler: (e: IEvent) => any): T;

    /**
     * Observes specified event
     * @param eventName Object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})
     */
    on(eventName: {[key:string] : Function}): T;
    /**
     * Fires event with an optional options object
     * @deprecated `fire` deprecated since 1.0.7 (use `trigger` instead)
     * @param {String} eventName Event name to fire
     * @param {Object} [options] Options object
     */
    trigger(eventName: string, options?: any): T;
    /**
     * Stops event observing for a particular event handler. Calling this method
     * without arguments removes all handlers for all events
     * @deprecated `stopObserving` deprecated since 0.8.34 (use `off` instead)
     * @param eventName Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})
     * @param handler Function to be deleted from EventListeners
     */
    off(eventName?: string|any, handler?: (e: IEvent) => any): T;
  }

  // animation mixin
  // ----------------------------------------------------
  interface ICanvasAnimation<T> {
    FX_DURATION: number;
    /**
     * Centers object horizontally with animation.
     * @param {fabric.Object} object Object to center
     * @param {Object} [callbacks] Callbacks object with optional "onComplete" and/or "onChange" properties
     * @param {Function} [callbacks.onComplete] Invoked on completion
     * @param {Function} [callbacks.onChange] Invoked on every step of animation
     */
    fxCenterObjectH(object: IObject, callbacks?: { onComplete: Function; onChange: Function; }): T;

    /**
     * Centers object vertically with animation.
     * @param {fabric.Object} object Object to center
     * @param {Object} [callbacks] Callbacks object with optional "onComplete" and/or "onChange" properties
     * @param {Function} [callbacks.onComplete] Invoked on completion
     * @param {Function} [callbacks.onChange] Invoked on every step of animation
     */
    fxCenterObjectV(object: IObject, callbacks?: { onComplete: Function; onChange: Function; }): T;

    /**
     * Same as `fabric.Canvas#remove` but animated
     * @param {fabric.Object} object Object to remove
     * @param {Object} [callbacks] Callbacks object with optional "onComplete" and/or "onChange" properties
     * @param {Function} [callbacks.onComplete] Invoked on completion
     * @param {Function} [callbacks.onChange] Invoked on every step of animation
     * @return {fabric.Canvas} thisArg
     * @chainable
     */
    fxRemove(object: IObject, callbacks?: { onComplete: Function; onChange: Function; }): T;
  }
  interface IObjectAnimation<T> {
    /**
     * Animates object's properties
     * object.animate('left', ..., {duration: ...});
     * @param property Property to animate
     * @param value Value to animate property
     * @param options The animation options
     */
    animate(property: string, value: number|string, options?: IAnimationOptions): IObject;
    /**
     * Animates object's properties
     * object.animate({ left: ..., top: ... }, { duration: ... });
     * @param properties Properties to animate 
     * @param value Options object
     */
    animate(properties: any, options?: IAnimationOptions): IObject;
  }
  interface IAnimationOptions {
    /**
     * Allows to specify starting value of animatable property (if we don't want current value to be used). 
     */
    from?: string|number;
    /**
     * Defaults to 500 (ms). Can be used to change duration of an animation. 
     */
    duration?: number;
    /**
     * Callback; invoked on every value change
     */
    onChange?: Function;
    /**
     * Callback; invoked when value change is completed
     */
    onComplete?: Function;

    /**
     * Easing function. Default: fabric.util.ease.easeInSine 
     */
    easing?: Function;
    /**
     *  Value to modify the property by, default: end - start
     */
    by?: number;
  }

  ///////////////////////////////////////////////////////////////////////////////
  // General Fabric Interfaces 
  //////////////////////////////////////////////////////////////////////////////
  interface IColor {
    /**
     * Returns source of this color (where source is an array representation; ex: [200, 200, 100, 1]) 
     */
    getSource(): number[];

    /**
     * Sets source of this color (where source is an array representation; ex: [200, 200, 100, 1]) 
     */
    setSource(source: number[]): void;

    /**
     * Returns color represenation in RGB format ex: rgb(0-255,0-255,0-255) 
     */
    toRgb(): string;

    /**
     * Returns color represenation in RGBA format ex: rgba(0-255,0-255,0-255,0-1) 
     */
    toRgba(): string;

    /**
     * Returns color represenation in HSL format ex: hsl(0-360,0%-100%,0%-100%) 
     */
    toHsl(): string;

    /**
     * Returns color represenation in HSLA format ex: hsla(0-360,0%-100%,0%-100%,0-1) 
     */
    toHsla(): string;

    /**
     * Returns color represenation in HEX format ex: FF5555 
     */
    toHex(): string;

    /**
     * Gets value of alpha channel for this color 
     */
    getAlpha(): number;

    /**
     * Sets value of alpha channel for this color
     * @param {Number} alpha Alpha value 0-1
     */
    setAlpha(alpha: number): void;

    /**
     * Transforms color to its grayscale representation 
     */
    toGrayscale(): IColor;

    /**
     * Transforms color to its black and white representation
     * @param {Number} threshold
     */
    toBlackWhite(threshold: number): IColor;
    /**
     * Overlays color with another color
     * @param {String|fabric.Color} otherColor
     */
    overlayWith(otherColor: string|IColor): IColor;
  }
  interface IColorStatic {
    /**
     * Color class
     * The purpose of Color is to abstract and encapsulate common color operations;
     * @param {String} color optional in hex or rgb(a) format
     */
    new (color?: string): IColor;

    /**
     * Returns new color object, when given a color in RGB format
     * @param {String} color Color value ex: rgb(0-255,0-255,0-255)
     */
    fromRgb(color: string): IColor;
    /**
     * Returns new color object, when given a color in RGBA format
     * @param {String} color Color value ex: rgb(0-255,0-255,0-255)
     */
    fromRgba(color: string): IColor;
    /**
     * Returns array represenatation (ex: [100, 100, 200, 1]) of a color that's in RGB or RGBA format
     * @param {String} color Color value ex: rgb(0-255,0-255,0-255), rgb(0%-100%,0%-100%,0%-100%)
     */
    sourceFromRgb(color: string): number[];
    /**
     * Returns new color object, when given a color in HSL format
     * @param {String} color Color value ex: hsl(0-260,0%-100%,0%-100%)
     */
    fromHsl(color: string): IColor;
    /**
     * Returns new color object, when given a color in HSLA format
     * @param {String} color Color value ex: hsl(0-260,0%-100%,0%-100%)
     */
    fromHsla(color: string): IColor;
    /**
     * Returns array represenatation (ex: [100, 100, 200, 1]) of a color that's in HSL or HSLA format.
     * @param {String} color Color value ex: hsl(0-360,0%-100%,0%-100%) or hsla(0-360,0%-100%,0%-100%, 0-1)
     */
    sourceFromHsl(color: string): number[];
    /**
     * Returns new color object, when given a color in HEX format
     * @param {String} color Color value ex: FF5555
     */
    fromHex(color: string): IColor;

    /**
     * Returns array represenatation (ex: [100, 100, 200, 1]) of a color that's in HEX format
     * @param {String} color ex: FF5555
     */
    sourceFromHex(color: string): number[];
    /**
     * Returns new color object, when given color in array representation (ex: [200, 100, 100, 0.5])
     * @param {Array} source
     */
    fromSource(source: number[]): IColor;
    prototype: any;
  }

  interface IGradientOptions {
    /**
     * @param {String} [options.type] Type of gradient 'radial' or 'linear' 
     */
    type?: string;
    /**
     * x-coordinate of start point
     */
    x1?: number;
    /**
     * y-coordinate of start point
     */
    y1?: number;
    /**
     * x-coordinate of end point
     */
    x2?: number;
    /**
     * y-coordinate of end point
     */
    y2?: number;
    /**
     * Radius of start point (only for radial gradients)
     */
    r1?: number;
    /**
     * Radius of end point (only for radial gradients)
     */
    r2?: number;
    /**
     * Color stops object eg. {0:string; 1:string;
     */
    colorStops?: any;
  }
  interface IGradient extends IGradientOptions {
    /**
     * Adds another colorStop
     * @param {Object} colorStop Object with offset and color
     */
    addColorStop(colorStop: any): IGradient;
    /**
     * Returns object representation of a gradient
     */
    toObject(): any;
    /**
     * Returns SVG representation of an gradient
     * @param {Object} object Object to create a gradient for
     * @param {Boolean} normalize Whether coords should be normalized
     * @return {String} SVG representation of an gradient (linear/radial)
     */
    toSVG(object: IObject, normalize?: boolean): string;

    /**
     * Returns an instance of CanvasGradient
     * @param {CanvasRenderingContext2D} ctx Context to render on
     */
    toLive(ctx: CanvasRenderingContext2D, object?: IPathGroup): CanvasGradient;
  }
  interface IGrandientStatic {
    new (options?: IGradientOptions): IGradient;
    /**
     * Returns instance from an SVG element
     * @param {SVGGradientElement} el SVG gradient element
     * @param {fabric.Object} instance
     */
    fromElement(el: SVGGradientElement, instance: IObject): IGradient;
    /**
     * Returns instance from its object representation
     * @param {Object} obj
     * @param {Object} [options] Options object
     */
    fromObject(obj: any, options: any[]): IGradient;
  }

  interface IIntersection {
    /**
     * Appends a point to intersection 
     */
    appendPoint(point: IPoint): void;
    /**
     * Appends points to intersection 
     */
    appendPoints(points: IPoint[]): void;
  }
  interface IIntersectionStatic {
    /**
     * Intersection class
     */
    new (status?: string): void;
    /**
     * Checks if polygon intersects another polygon 
     */
    intersectPolygonPolygon(points1: IPoint[], points2: IPoint[]): IIntersection;
    /**
     * Checks if line intersects polygon
     */
    intersectLinePolygon(a1: IPoint, a2: IPoint, points: IPoint[]): IIntersection;
    /**
     * Checks if one line intersects another
     */
    intersectLineLine(a1: IPoint, a2: IPoint, b1: IPoint, b2: IPoint): IIntersection;
    /**
     * Checks if polygon intersects rectangle 
     */
    intersectPolygonRectangle(points: IPoint[], r1: number, r2: number): IIntersection;
  }

  interface IPatternOptions {
    /**
     * Repeat property of a pattern (one of repeat, repeat-x, repeat-y or no-repeat) 
     */
    repeat: string;

    /**
     * Pattern horizontal offset from object's left/top corner 
     */
    offsetX: number;

    /**
     * Pattern vertical offset from object's left/top corner 
     */
    offsetY: number;
    /**
     * The source for the pattern
     */
    source: string|HTMLImageElement;
  }
  interface IPattern extends IPatternOptions {
    new (options?: IPatternOptions): IPattern;

    initialise(options?: IPatternOptions): IPattern;
    /**
     * Returns an instance of CanvasPattern
     */
    toLive(ctx: CanvasRenderingContext2D): IPattern;

    /**
     * Returns object representation of a pattern
     */
    toObject(): any;
    /**
     * Returns SVG representation of a pattern
     * @param {fabric.Object} object
     */
    toSVG(object: IObject): string;
  }
  interface IPatternStatic {
    new (options?: IPatternOptions): IPattern;
    prototype: any;
  }

  interface IPoint {
    x: number;
    y: number;
    /**
     * Adds another point to this one and returns another one
     * @param {fabric.Point} that
     */
    add(that: IPoint): IPoint;

    /**
     * Adds another point to this one
     * @param {fabric.Point} that
     */
    addEquals(that: IPoint): IPoint;

    /**
     * Adds value to this point and returns a new one
     * @param {Number} scalar
     */
    scalarAdd(scalar: number): IPoint;

    /**
     * Adds value to this point
     * @param {Number} scalar
     */
    scalarAddEquals(scalar: number): IPoint;

    /**
     * Subtracts another point from this point and returns a new one
     * @param {fabric.Point} that
     */
    subtract(that: IPoint): IPoint;

    /**
     * Subtracts another point from this point
     * @param {fabric.Point} that
     */
    subtractEquals(that: IPoint): IPoint;

    /**
     * Subtracts value from this point and returns a new one
     * @param {Number} scalar
     */
    scalarSubtract(scalar: number): IPoint;

    /**
     * Subtracts value from this point
     * @param {Number} scalar
     */
    scalarSubtractEquals(scalar: number): IPoint;

    /**
     * Miltiplies this point by a value and returns a new one
     * @param {Number} scalar
     */
    multiply(scalar: number): IPoint;

    /**
     * Miltiplies this point by a value
     * @param {Number} scalar
     */
    multiplyEquals(scalar: number): IPoint;

    /**
     * Divides this point by a value and returns a new one
     * @param {Number} scalar
     */
    divide(scalar: number): IPoint;

    /**
     * Divides this point by a value
     * @param {Number} scalar
     */
    divideEquals(scalar: number): IPoint;

    /**
     * Returns true if this point is equal to another one
     * @param {fabric.Point} that
     */
    eq(that: IPoint): IPoint;

    /**
     * Returns true if this point is less than another one
     * @param {fabric.Point} that
     */
    lt(that: IPoint): IPoint;

    /**
     * Returns true if this point is less than or equal to another one
     * @param {fabric.Point} that
     */
    lte(that: IPoint): IPoint;

    /**
     * Returns true if this point is greater another one
     * @param {fabric.Point} that
     */
    gt(that: IPoint): IPoint;

    /**
     * Returns true if this point is greater than or equal to another one
     * @param {fabric.Point} that
     */
    gte(that: IPoint): IPoint;

    /**
     * Returns new point which is the result of linear interpolation with this one and another one
     * @param {fabric.Point} that
     * @param {Number} t
     */
    lerp(that: IPoint, t: number): IPoint;

    /**
     * Returns distance from this point and another one
     * @param {fabric.Point} that
     */
    distanceFrom(that: IPoint): number;

    /**
     * Returns the point between this point and another one
     * @param {fabric.Point} that
     */
    midPointFrom(that: IPoint): IPoint;

    /**
     * Returns a new point which is the min of this and another one
     * @param {fabric.Point} that
     */
    min(that: IPoint): IPoint;

    /**
     * Returns a new point which is the max of this and another one
     * @param {fabric.Point} that
     */
    max(that: IPoint): IPoint;

    /**
     * Returns string representation of this point
     */
    toString(): string;

    /**
     * Sets x/y of this point
     * @param {Number} x
     * @param {Number} y
     */
    setXY(x:number, y: number): IPoint;

    /**
     * Sets x/y of this point from another point
     * @param {fabric.Point} that
     */
    setFromPoint(that: IPoint): IPoint;

    /**
     * Swaps x/y of this point and another point
     * @param {fabric.Point} that
     */
    swap(that: IPoint): IPoint;
  }
  interface IPointStatic {
    new (x: number, y: number): IPoint;
    prototype: any;
  }

  interface IShadowOptions {
    /**
     * Whether the shadow should affect stroke operations 
     */
    affectStrike: boolean;
    /**
     * Shadow blur 
     */
    blur: number;
    /**
     * Shadow color 
     */
    color: string;
    /**
     * Indicates whether toObject should include default values 
     */
    includeDefaultValues: boolean;
    /**
     * Shadow horizontal offset 
     */
    offsetX: number;
    /**
     * Shadow vertical offset 
     */
    offsetY: number;
  }
  interface IShadow extends IShadowOptions {
    initialize(options?: IShadowOptions|string): IShadow;
    /**
     * Returns object representation of a shadow 
     */
    toObject(): IObject;
    /**
     * Returns a string representation of an instance, CSS3 text-shadow declaration 
     */
    toString(): string;
    /**
     * Returns SVG representation of a shadow
     * @param {fabric.Object} object
     */
    toSVG(object: IObject): string;

    /**
     * Regex matching shadow offsetX, offsetY and blur, Static 
     */
    reOffsetsAndBlur: RegExp
  }
  interface IShadowStatic {
    new (options?: IShadowOptions): IShadow;
    reOffsetsAndBlur: RegExp;
  }

  ///////////////////////////////////////////////////////////////////////////////
  // Canvas Interfaces
  //////////////////////////////////////////////////////////////////////////////
  interface ICanvasDimensions {
    /**
     * Width of canvas element 
     */
    width: number;
    /**
     * Height of canvas element 
     */
    height: number;
  }
  interface ICanvasDimensionsOptions {
    /**
     * Set the given dimensions only as canvas backstore dimensions
     */
    backstoreOnly?: boolean;
    /**
     * Set the given dimensions only as css dimensions 
     */
    cssOnly?: boolean;
  }

  interface IStaticCanvasOptions {
    /**
     * Indicates whether the browser can be scrolled when using a touchscreen and dragging on the canvas 
     */
    allowTouchScrolling?: boolean;
    /**
     * Indicates whether this canvas will use image smoothing, this is on by default in browsers    
     */
    imageSmoothingEnabled?: boolean;

    /**
     * Indicates whether objects should remain in current stack position when selected. 
     * When false objects are brought to top and rendered as part of the selection group 
     */
    preserveObjectStacking?: boolean;

    /**
     * The transformation (in the format of Canvas transform) which focuses the viewport 
     */
    viewportTransform?: number[];

    freeDrawingColor?: string;
    freeDrawingLineWidth?: number;

    /**
     * Background color of canvas instance. 
     * Should be set via setBackgroundColor 
     */
    backgroundColor?: string|IPattern;
    /**
     * Background image of canvas instance.
     * Should be set via setBackgroundImage
     * <b>Backwards incompatibility note:</b> The "backgroundImageOpacity" and "backgroundImageStretch" properties are deprecated since 1.3.9.
     */
    backgroundImage?: IImage | string;
    backgroundImageOpacity?: number;
    backgroundImageStretch?: number;
    /**
     * Function that determines clipping of entire canvas area
     * Being passed context as first argument. See clipping canvas area
     */
    clipTo?: (context: CanvasRenderingContext2D) => void;

    /**
     * Indicates whether object controls (borders/controls) are rendered above overlay image 
     */
    controlsAboveOverlay?: boolean;

    /**
     * Indicates whether toObject/toDatalessObject should include default values 
     */
    includeDefaultValues?: boolean;
    /**
     * Overlay color of canvas instance.
     * Should be set via setOverlayColor
     */
    overlayColor?: string|IPattern;
    /**
     * Overlay image of canvas instance.
     * Should be set via setOverlayImage
     * <b>Backwards incompatibility note:</b> The "overlayImageLeft" and "overlayImageTop" properties are deprecated since 1.3.9.
     */
    overlayImage?: IImage;
    overlayImageLeft?: number;
    overlayImageTop?: number;
    /**
     * Indicates whether add, insertAt and remove should also re-render canvas.
     * Disabling this option could give a great performance boost when adding/removing a lot of objects to/from canvas at once
     * (followed by a manual rendering after addition/deletion)
     */
    renderOnAddRemove?: boolean;
    /**
     * Indicates whether objects' state should be saved 
     */
    stateful?: boolean;
  }
  interface IStaticCanvas extends IObservable<IStaticCanvas>, IStaticCanvasOptions, ICollection<IStaticCanvas>, ICanvasAnimation<IStaticCanvas> {
    /**
     * Calculates canvas element offset relative to the document
     * This method is also attached as "resize" event handler of window
     */
    calcOffset(): IStaticCanvas;

    /**
     * Sets {@link fabric.StaticCanvas#overlayImage|overlay image} for this canvas
     * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set overlay to
     * @param {Function} callback callback to invoke when image is loaded and set as an overlay
     * @param {Object} [options] Optional options to set for the {@link fabric.Image|overlay image}.
     */
    setOverlayImage(image: IImage|string, callback: Function, options?: IObjectOptions): IStaticCanvas;

    /**
     * Sets {@link fabric.StaticCanvas#backgroundImage|background image} for this canvas
     * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set background to
     * @param {Function} callback Callback to invoke when image is loaded and set as background
     * @param {Object} [options] Optional options to set for the {@link fabric.Image|background image}.
     */
    setBackgroundImage(image: IImage|string, callback: Function, options?: IObjectOptions): IStaticCanvas;

    /**
     * Sets {@link fabric.StaticCanvas#overlayColor|background color} for this canvas
     * @param {(String|fabric.Pattern)} overlayColor Color or pattern to set background color to
     * @param {Function} callback Callback to invoke when background color is set
     */
    setOverlayColor(overlayColor: string|IPattern, callback: Function): IStaticCanvas;

    /**
     * Sets {@link fabric.StaticCanvas#backgroundColor|background color} for this canvas
     * @param {(String|fabric.Pattern)} backgroundColor Color or pattern to set background color to
     * @param {Function} callback Callback to invoke when background color is set
     */
    setBackgroundColor(backgroundColor: string|IPattern, callback: Function): IStaticCanvas;

    /**
     * Returns canvas width (in px) 
     */
    getWidth(): number;

    /**
     * Returns canvas height (in px)
     */
    getHeight(): number;

    /**
     * Sets width of this canvas instance
     * @param {Number|String} value                         Value to set width to
     * @param {Object}        [options]                     Options object
     */
    setWidth(value: number|string, options?: ICanvasDimensionsOptions): IStaticCanvas

    /**
     * Sets height of this canvas instance
     * @param {Number|String} value                         Value to set height to
     * @param {Object}        [options]                     Options object
     */
    setHeight(value: number|string, options?: ICanvasDimensionsOptions): IStaticCanvas;

    /**
     * Sets dimensions (width, height) of this canvas instance. when options.cssOnly flag active you should also supply the unit of measure (px/%/em)
     * @param {Object}        dimensions                    Object with width/height properties
     * @param {Object}        [options]                     Options object
     */
    setDimensions(dimensions: ICanvasDimensions, options?: ICanvasDimensionsOptions): IStaticCanvas;

    /**
     * Returns canvas zoom level 
     */
    getZoom(): number;

    /**
     * Sets viewport transform of this canvas instance
     * @param {Array} vpt the transform in the form of context.transform
     */
    setViewportTransform(vpt: number[]): IStaticCanvas;

    /**
     * Sets zoom level of this canvas instance, zoom centered around point
     * @param {fabric.Point} point to zoom with respect to
     * @param {Number} value to set zoom to, less than 1 zooms out
     */
    zoomToPoint(point: IPoint, value: number): IStaticCanvas;

    /**
     * Sets zoom level of this canvas instance
     * @param {Number} value to set zoom to, less than 1 zooms out
     */
    setZoom(value: number): IStaticCanvas;

    /**
     * Pan viewport so as to place point at top left corner of canvas
     * @param {fabric.Point} point to move to
     */
    absolutePan(point: IPoint): IStaticCanvas;

    /**
     * Pans viewpoint relatively
     * @param {fabric.Point} point (position vector) to move by
     */
    relativePan(point: IPoint): IStaticCanvas;

    /**
     * Returns <canvas> element corresponding to this instance 
     */
    getElement(): HTMLCanvasElement;

    /**
     * Returns currently selected object, if any 
     */
    getActiveObject(): IObject;

    /**
     * Returns currently selected group of object, if any 
     */
    getActiveGroup(): IGroup;

    /**
     * Clears specified context of canvas element
     * @param {CanvasRenderingContext2D} ctx Context to clear
     * @chainable
     */
    clearContext(ctx: CanvasRenderingContext2D): IStaticCanvas;

    /**
     * Returns context of canvas where objects are drawn 
     */
    getContext(): CanvasRenderingContext2D;

    /**
     * Clears all contexts (background, main, top) of an instance 
     */
    clear(): IStaticCanvas;

    /**
     * Renders both the top canvas and the secondary container canvas.
     * @param {Boolean} [allOnTop] Whether we want to force all images to be rendered on the top canvas
     * @chainable
     */
    renderAll(allOnTop?: boolean): IStaticCanvas;

    /**
     * Method to render only the top canvas.
     * Also used to render the group selection box.
     * @chainable
     */
    renderTop(): IStaticCanvas;

    /**
     * Returns coordinates of a center of canvas.
     * Returned value is an object with top and left properties
     */
    getCenter(): { top: number; left: number; };
    /**
     * Centers object horizontally.
     * You might need to call `setCoords` on an object after centering, to update controls area.
     * @param {fabric.Object} object Object to center horizontally
     */
    centerObjectH(object: IObject): IStaticCanvas;

    /**
     * Centers object vertically.
     * You might need to call `setCoords` on an object after centering, to update controls area.
     * @param {fabric.Object} object Object to center vertically
     */
    centerObjectV(object: IObject): IStaticCanvas;

    /**
     * Centers object vertically and horizontally.
     * You might need to call `setCoords` on an object after centering, to update controls area.
     * @param {fabric.Object} object Object to center vertically and horizontally
     */
    centerObject(object: IObject): IStaticCanvas;

    /**
     * Returs dataless JSON representation of canvas
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    toDatalessJSON(propertiesToInclude?: any[]): string;

    /**
     * Returns object representation of canvas
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    toObject(propertiesToInclude?: any[]): any;

    /**
     * Returns dataless object representation of canvas
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    toDatalessObject(propertiesToInclude?: any[]): any;

    /**
     * When true, getSvgTransform() will apply the StaticCanvas.viewportTransform to the SVG transformation. When true,
     * a zoomed canvas will then produce zoomed SVG output.
     */
    svgViewportTransformation: boolean;

    /**
     * Returns SVG representation of canvas
     * @param {Object} [options] Options object for SVG output
     * @param {Function} [reviver] Method for further parsing of svg elements, called after each fabric object converted into svg representation.
     */
    toSVG(options: IToSVGOptions, reviver?: Function): string;

    /**
     * Moves an object to the bottom of the stack of drawn objects
     * @param {fabric.Object} object Object to send to back
     * @chainable
     */
    sendToBack(object: IObject): IStaticCanvas;

    /**
     * Moves an object to the top of the stack of drawn objects
     * @param {fabric.Object} object Object to send
     * @chainable
     */
    bringToFront(object: IObject): IStaticCanvas;

    /**
     * Moves an object down in stack of drawn objects
     * @param {fabric.Object} object Object to send
     * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object
     * @chainable
     */
    sendBackwards(object: IObject): IStaticCanvas;

    /**
     * Moves an object up in stack of drawn objects
     * @param {fabric.Object} object Object to send
     * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object
     * @chainable
     */
    bringForward(object: IObject): IStaticCanvas;
    /**
     * Moves an object to specified level in stack of drawn objects
     * @param {fabric.Object} object Object to send
     * @param {Number} index Position to move to
     * @chainable
     */
    moveTo(object: IObject, index: number): IStaticCanvas;

    /**
     * Clears a canvas element and removes all event listeners 
     */
    dispose(): IStaticCanvas;

    /**
     * Returns a string representation of an instance 
     */
    toString(): string;

    /**
     * Exports canvas element to a dataurl image. Note that when multiplier is used, cropping is scaled appropriately
     * @param {Object} [options] Options object
     */
    toDataURL(options?: IDataURLOptions): string;

    /**
     * Provides a way to check support of some of the canvas methods
     * (either those of HTMLCanvasElement itself, or rendering context)
     * @param {String} methodName Method to check support for; Could be one of "getImageData", "toDataURL", "toDataURLWithQuality" or "setLineDash"
     * @return {Boolean | null} `true` if method is supported (or at least exists), null` if canvas element or context can not be initialized
     */
    supports(methodName: string): boolean;

    /**
     * Populates canvas with data from the specified JSON.
     * JSON format must conform to the one of toJSON formats
     * @param {String|Object} json JSON string or object
     * @param {Function} callback Callback, invoked when json is parsed
     *                            and corresponding objects (e.g: {@link fabric.Image})
     *                            are initialized
     * @param {Function} [reviver] Method for further parsing of JSON elements, called after each fabric object created.
     */
    loadFromJSON(json: string|any, callback: Function, reviver?: Function): ICanvas;
    /**
     * Clones canvas instance
     * @param {Object} [callback] Receives cloned instance as a first argument
     * @param {Array} [properties] Array of properties to include in the cloned canvas and children
     */
    clone(callback: (canvas: IStaticCanvas) => any, properties?: any[]): void;

    /**
     * Clones canvas instance without cloning existing data.
     * This essentially copies canvas dimensions, clipping properties, etc.
     * but leaves data empty (so that you can populate it with your own)
     * @param {Object} [callback] Receives cloned instance as a first argument
     */
    cloneWithoutData(callback: (canvas: IStaticCanvas) => any): void;

    /**
     * Callback; invoked right before object is about to be scaled/rotated
     */
    onBeforeScaleRotate(target: IObject): void;

    // Functions from object straighten mixin
    // --------------------------------------------------------------------------------------------------------------------------------

    /**
     * Straightens object, then rerenders canvas
     * @param {fabric.Object} object Object to straighten
     */
    straightenObject(object: IObject): IStaticCanvas

    /**
     * Same as straightenObject, but animated
     * @param {fabric.Object} object Object to straighten
     */
    fxStraightenObject(object: IObject): IStaticCanvas
  }
  interface IStaticCanvasStatic {
    /**
     * Constructor
     * @param {HTMLElement|String} element <canvas> element to initialize instance on
     * @param {Object} [options] Options object
     */
    new (element: HTMLCanvasElement|string, options?: ICanvasOptions): IStaticCanvas;

    EMPTY_JSON: string;
    /**
     * Provides a way to check support of some of the canvas methods
     * (either those of HTMLCanvasElement itself, or rendering context)
     * @param {String} methodName Method to check support for; Could be one of "getImageData", "toDataURL", "toDataURLWithQuality" or "setLineDash"
     */
    supports(methodName: string): boolean;
    prototype: any;
    /**
     * Returns JSON representation of canvas
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    toJSON(propertiesToInclude?: any[]): string;
  }

  interface ICanvasOptions extends IStaticCanvasOptions {
    /**
     * When true, objects can be transformed by one side (unproportionally)
     */
    uniScaleTransform?: boolean;

    /**
     * When true, objects use center point as the origin of scale transformation.
     * <b>Backwards incompatibility note:</b> This property replaces "centerTransform" (Boolean).
     */
    centeredScaling?: boolean;

    /**
     * When true, objects use center point as the origin of rotate transformation.
     * <b>Backwards incompatibility note:</b> This property replaces "centerTransform" (Boolean).
     */
    centeredRotation?: boolean;

    /**
     * Indicates that canvas is interactive. This property should not be changed.
     */
    interactive?: boolean;

    /**
     * Indicates whether group selection should be enabled
     */
    selection?: boolean;

    /**
     * Color of selection
     */
    selectionColor?: string;

    /**
     * Default dash array pattern
     * If not empty the selection border is dashed
     */
    selectionDashArray?: any[];

    /**
     * Color of the border of selection (usually slightly darker than color of selection itself)
     */
    selectionBorderColor?: string;

    /**
     * Width of a line used in object/group selection
     */
    selectionLineWidth?: number;

    /**
     * Default cursor value used when hovering over an object on canvas
     */
    hoverCursor?: string;

    /**
     * Default cursor value used when moving an object on canvas
     */
    moveCursor?: string;

    /**
     * Default cursor value used for the entire canvas
     */
    defaultCursor?: string;

    /**
     * Cursor value used during free drawing
     */
    freeDrawingCursor?: string;

    /**
     * Cursor value used for rotation point
     */
    rotationCursor?: string;

    /**
     * Default element class that's given to wrapper (div) element of canvas
     */
    containerClass?: string;

    /**
     * When true, object detection happens on per-pixel basis rather than on per-bounding-box
     */
    perPixelTargetFind?: boolean;

    /**
     * Number of pixels around target pixel to tolerate (consider active) during object detection
     */
    targetFindTolerance?: number;

    /**
     * When true, target detection is skipped when hovering over canvas. This can be used to improve performance.
     */
    skipTargetFind?: boolean;

    /**
     * When true, mouse events on canvas (mousedown/mousemove/mouseup) result in free drawing.
     * After mousedown, mousemove creates a shape,
     * and then mouseup finalizes it and adds an instance of `fabric.Path` onto canvas.
     */
    isDrawingMode?: boolean;
  }
  interface ICanvas extends IStaticCanvas, ICanvasOptions {
    _objects: IObject[];

    /**
     * Checks if point is contained within an area of given object
     * @param {Event} e Event object
     * @param {fabric.Object} target Object to test against
     */
    containsPoint(e: Event, target: IObject): boolean;
    /**
     * Deactivates all objects on canvas, removing any active group or object
     * @return {fabric.Canvas} thisArg
     */
    deactivateAll(): ICanvas;
    /**
     * Deactivates all objects and dispatches appropriate events
     * @param {Event} [e] Event (passed along when firing)
     * @return {fabric.Canvas} thisArg
     */
    deactivateAllWithDispatch(e?: Event): ICanvas;
    /**
     * Discards currently active group
     * @param {Event} [e] Event (passed along when firing)
     * @return {fabric.Canvas} thisArg
     */
    discardActiveGroup(e?: Event): ICanvas;
    /**
     * Discards currently active object
     * @param {Event} [e] Event (passed along when firing)
     * @return {fabric.Canvas} thisArg
     * @chainable
     */
    discardActiveObject(e?: Event): ICanvas;
    /**
     * Draws objects' controls (borders/controls)
     * @param {CanvasRenderingContext2D} ctx Context to render controls on
     */
    drawControls(ctx: CanvasRenderingContext2D): void;
    /**
     * Method that determines what object we are clicking on
     * @param {Event} e mouse event
     * @param {Boolean} skipGroup when true, group is skipped and only objects are traversed through
     */
    findTarget(e: MouseEvent, skipGroup: boolean): ICanvas;
    /**
     * Returns currently active group
     * @return {fabric.Group} Current group
     */
    getActiveGroup(): IGroup;
    /**
     * Returns currently active object
     * @return {fabric.Object} active object
     */
    getActiveObject(): IObject;
    /**
     * Returns pointer coordinates relative to canvas.
     * @param {Event} e
     * @return {Object} object with "x" and "y" number values
     */
    getPointer(e: Event, ignoreZoom?: boolean, upperCanvasEl?: CanvasRenderingContext2D): { x: number; y: number; };
    /**
     * Returns context of canvas where object selection is drawn
     * @return {CanvasRenderingContext2D}
     */
    getSelectionContext(): CanvasRenderingContext2D;
    /**
     * Returns <canvas> element on which object selection is drawn
     * @return {HTMLCanvasElement}
     */
    getSelectionElement(): HTMLCanvasElement;
    /**
     * Returns true if object is transparent at a certain location
     * @param {fabric.Object} target Object to check
     * @param {Number} x Left coordinate
     * @param {Number} y Top coordinate
     */
    isTargetTransparent(target: IObject, x: number, y: number): boolean;
    /**
     * Sets active group to a speicified one
     * @param {fabric.Group} group Group to set as a current one
     * @param {Event} [e] Event (passed along when firing)
     */
    setActiveGroup(group: IGroup, e?: Event): ICanvas;
    /**
     * Sets given object as the only active object on canvas
     * @param {fabric.Object} object Object to set as an active one
     * @param {Event} [e] Event (passed along when firing "object:selected")
     */
    setActiveObject(object: IObject, e?: Event): ICanvas;
    /**
     * Set the cursor type of the canvas element
     * @param {String} value Cursor type of the canvas element.
     * @see http://www.w3.org/TR/css3-ui/#cursor
     */
    setCursor(value: string): void;

    /**
     * Removes all event listeners
     */
    removeListeners(): void
  }
  interface ICanvasStatic {
    /**
     * Constructor
     * @param {HTMLElement|String} element <canvas> element to initialize instance on
     * @param {Object} [options] Options object
     */
    new (element: HTMLCanvasElement | string, options?: ICanvasOptions): ICanvas;

    EMPTY_JSON: string;
    /**
     * Provides a way to check support of some of the canvas methods
     * (either those of HTMLCanvasElement itself, or rendering context)
     * @param {String} methodName Method to check support for; Could be one of "getImageData", "toDataURL", "toDataURLWithQuality" or "setLineDash"
     */
    supports(methodName: string): boolean;
    prototype: any;
    /**
     * Returns JSON representation of canvas
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    toJSON(propertiesToInclude?: any[]): string;
  }

  ///////////////////////////////////////////////////////////////////////////////
  // Shape Interfaces
  //////////////////////////////////////////////////////////////////////////////

  interface ICircleOptions extends IObjectOptions {
    /**
     * Radius of this circle
     */
    radius?: number;
    /**
     * Start angle of the circle, moving clockwise
     */
    startAngle?: number;

    /**
     * End angle of the circle
     */
    endAngle?: number;
  }
  interface ICircle extends IObject, ICircleOptions {
    /**
     * Returns complexity of an instance
     * @return {Number} complexity of this instance
     */
    complexity(): number;
    /**
     * Returns horizontal radius of an object (according to how an object is scaled)
     * @return {Number}
     */
    getRadiusX(): number;
    /**
     * Returns vertical radius of an object (according to how an object is scaled)
     * @return {Number}
     */
    getRadiusY(): number;
    /**
     * Sets radius of an object (and updates width accordingly)
     * @return {Number}
     */
    setRadius(value: number): number;

    /**
     * Returns object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toObject(propertiesToInclude?: any[]): any;
    /**
     * Returns svg representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
  }
  interface ICircleStatic {
    /**
     * List of attribute names to account for when parsing SVG element (used by {@link fabric.Circle.fromElement})
     */
    ATTRIBUTE_NAMES: string[];
    /**
     * Returns Circle instance from an SVG element
     * @param {SVGElement} element Element to parse
     * @param {Object} [options] Options object
     */
    fromElement(element: SVGElement, options: ICircleOptions): ICircle;
    /**
     * Returns Circle instance from an object representation
     * @param {Object} object Object to create an instance from
     */
    fromObject(object: any): ICircle;
    /**
     * Circle class
     */
    new (options?: ICircleOptions): ICircle;
    prototype: any;
  }

  interface IEllipseOptions extends IObjectOptions {
    /**
     * Horizontal radius
     */
    rx?: number;
    /**
     * Vertical radius
     */
    ry?: number;
  }
  interface IEllipse extends IObject, IEllipseOptions {
    /**
     * Returns horizontal radius of an object (according to how an object is scaled)
     * @return {Number}
     */
    getRx(): number;

    /**
     * Returns Vertical radius of an object (according to how an object is scaled)
     * @return {Number}
     */
    getRy(): number;
    /**
     * Returns object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toObject(propertiesToInclude?: any[]): any;
    /**
     * Returns svg representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
    /**
     * Returns complexity of an instance
     * @return {Number} complexity
     */
    complexity(): number;
  }
  interface IEllipseStatic {
    new (options?: IEllipseOptions): IEllipse;
    /**
     * List of attribute names to account for when parsing SVG element (used by {@link fabric.Ellipse.fromElement})
     */
    ATTRIBUTE_NAMES: string[];

    /**
     * Returns Ellipse instance from an SVG element
     * @param {SVGElement} element Element to parse
     * @param {Object} [options] Options object
     */
    fromElement(element: SVGElement, options?: IEllipseOptions): IEllipse;

    /**
     * Returns Ellipse instance from an object representation
     * @param {Object} object Object to create an instance from
     */
    fromObject(object: any): IEllipse;
  }

  interface IGroup extends IObject, ICollection<IGroup> {
    activateAllObjects(): IGroup;
    /**
     * Adds an object to a group; Then recalculates group's dimension, position.
     * @param {Object} object
     * @return {fabric.Group} thisArg
     * @chainable
     */
    addWithUpdate(object: IObject): IGroup;
    containsPoint(point: IPoint): boolean;
    /**
     * Destroys a group (restoring state of its objects)
     * @return {fabric.Group} thisArg
     * @chainable
     */
    destroy(): IGroup;
    /**
     * Returns requested property
     * @param {String} prop Property to get
     * @return {Any}
     */
    get(prop: string): any;
    /**
     * Checks whether this group was moved (since `saveCoords` was called last)
     * @return {Boolean} true if an object was moved (since fabric.Group#saveCoords was called)
     */
    hasMoved(): boolean;
    /**
     * Removes an object from a group; Then recalculates group's dimension, position.
     * @param {Object} object
     * @return {fabric.Group} thisArg
     * @chainable
     */
    removeWithUpdate(object: IObject): IGroup;
    /**
     * Renders instance on a given context
     * @param {CanvasRenderingContext2D} ctx context to render instance on
     */
    render(ctx: CanvasRenderingContext2D): void;
    /**
     * Removes objects from a collection, then renders canvas (if `renderOnAddRemove` is not `false`)
     * @param {...fabric.Object} object Zero or more fabric instances
     * @return {Self} thisArg
     * @chainable
     */
    remove(...object: IObject[]): IGroup;
    /**
     * Saves coordinates of this instance (to be used together with `hasMoved`)
     * @saveCoords
     * @return {fabric.Group} thisArg
     * @chainable
     */
    saveCoords(): IGroup;
    /**
     * Sets coordinates of all group objects
     * @return {fabric.Group} thisArg
     * @chainable
     */
    setObjectsCoords(): IGroup;
    /**
     * Returns object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toObject(propertiesToInclude?: any[]): any;
    /**
     * Returns string represenation of a group
     * @return {String}
     */
    toString(): string;
    /**
     * Returns svg representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
  }
  interface IGroupStatic {
    /**
     * Constructor
     * @param {Object} objects Group objects
     * @param {Object} [options] Options object
     */
    new (items?: any[], options?: IObjectOptions): IGroup;
    /**
     * Returns {@link fabric.Group} instance from an object representation
     * @param {Object} object Object to create a group from
     * @param {Function} [callback] Callback to invoke when an group instance is created
     */
    fromObject(object: any, callback: (group: IGroup) => any): void;
  }

  interface IImageOptions extends IObjectOptions {
    /**
     * crossOrigin value (one of "", "anonymous", "allow-credentials")
     */
    crossOrigin: string;

    /**
     * AlignX value, part of preserveAspectRatio (one of "none", "mid", "min", "max")
     * This parameter defines how the picture is aligned to its viewport when image element width differs from image width.
     */
    alignX: string;

    /**
     * AlignY value, part of preserveAspectRatio (one of "none", "mid", "min", "max")
     * This parameter defines how the picture is aligned to its viewport when image element height differs from image height.
     */
    alignY: string;

    /**
     * meetOrSlice value, part of preserveAspectRatio  (one of "meet", "slice").
     * if meet the image is always fully visibile, if slice the viewport is always filled with image.
     * @see http://www.w3.org/TR/SVG/coords.html#PreserveAspectRatioAttribute
     */
    meetOrSlice: string;

    /**
     * Image filter array 
     */
    filters: IBaseFilter[];
  }
  interface IImage extends IObject, IImageOptions {
    initialize(element?: string|HTMLImageElement, options?: IImageOptions): void;
    /**
     * Applies filters assigned to this image (from "filters" array)
     * @param {Function} callback Callback is invoked when all filters have been applied and new image is generated
     */
    applyFilters(callback: Function): void;
    /**
     * Returns a clone of an instance
     * @param {Function} callback Callback is invoked with a clone as a first argument
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    clone(callback?: Function, propertiesToInclude?: any[]): IObject;
    /**
     * Returns complexity of an instance
     * @return {Number} complexity of this instance
     */
    complexity(): number;
    /**
     * Returns image element which this instance if based on
     * @return {HTMLImageElement} Image element
     */
    getElement(): HTMLImageElement;
    /**
     * Returns original size of an image
     * @return {Object} Object with "width" and "height" properties
     */
    getOriginalSize(): { width: number; height: number; };
    /**
     * Returns source of an image
     * @return {String} Source of an image
     */
    getSrc(): string;
    render(ctx: CanvasRenderingContext2D, noTransform: boolean): void;

    /**
     * Sets image element for this instance to a specified one.
     * If filters defined they are applied to new image.
     * You might need to call `canvas.renderAll` and `object.setCoords` after replacing, to render new image and update controls area.
     * @param {HTMLImageElement} element
     * @param {Function} [callback] Callback is invoked when all filters have been applied and new image is generated
     * @param {Object} [options] Options object
     */
    setElement(element: HTMLImageElement, callback: Function, options: IImageOptions): IImage;
    /**
     * Sets crossOrigin value (on an instance and corresponding image element)
     */
    setCrossOrigin(value: string): IImage;
    /**
     * Returns object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} Object representation of an instance
     */
    toObject(propertiesToInclude?: any[]): any;
    /**
     * Returns string representation of an instance
     * @return {String} String representation of an instance
     */
    toString(): string;
    /**
     * Returns SVG representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
    /**
     * Sets source of an image
     * @param {String} src Source string (URL)
     * @param {Function} [callback] Callback is invoked when image has been loaded (and all filters have been applied)
     * @param {Object} [options] Options object
     */
    setSrc(src: string, callback: Function, options: IImageOptions): IImage;
  }
  interface IImageStatic {
    /**
     * Constructor
     * @param {HTMLImageElement | String} element Image element
     * @param {Object} [options] Options object
     */
    new (element: HTMLImageElement, objObjects: IObjectOptions): IImage;
    /**
     * Creates an instance of fabric.Image from an URL string
     * @param {String} url URL to create an image from
     * @param {Function} [callback] Callback to invoke when image is created (newly created image is passed as a first argument)
     * @param {Object} [imgOptions] Options object
     */
    fromURL(url: string, callback?: (image: IImage) => any, objObjects?: IObjectOptions): IImage;
    /**
     * Creates an instance of fabric.Image from its object representation
     * @static
     * @param {Object} object Object to create an instance from
     * @param {Function} [callback] Callback to invoke when an image instance is created
     */
    fromObject(object: any, callback: (image: IImage) => {}): void;
    /**
     * Returns Image instance from an SVG element
     * @param {SVGElement} element Element to parse
     * @param {Function} callback Callback to execute when fabric.Image object is created
     * @param {Object} [options] Options object
     */
    fromElement(element: SVGElement, callback: Function, options?: IImageOptions): void;
    prototype: any;
    /**
     * Default CSS class name for canvas
     */
    CSS_CANVAS: string;

    filters: IAllFilters
  }

  interface ILineOptions extends IObjectOptions {
    /**
     * x value or first line edge
     */
    x1: number;
    /**
     * x value or second line edge
     */
    x2: number;
    /**
     * y value or first line edge
     */
    y1: number;
    /**
     * y value or second line edge
     */
    y2: number;
  }
  interface ILine extends IObject, ILineOptions {
    /**
     * Returns complexity of an instance
     * @return {Number} complexity
     */
    complexity(): number;
    initialize(points?: number[], options?: ILineOptions): ILine;
    /**
     * Returns object representation of an instance
     * @methd toObject
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toObject(propertiesToInclude: any[]): any;
    /**
     * Returns SVG representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
  }
  interface ILineStatic {
    ATTRIBUTE_NAMES: string[];
    /**
     * Returns fabric.Line instance from an SVG element
     * @param {SVGElement} element Element to parse
     * @param {Object} [options] Options object
     */
    fromElement(element: SVGElement, options?: ILineOptions): ILine;
    /**
     * Returns fabric.Line instance from an object representation
     * @param {Object} object Object to create an instance from
     */
    fromObject(object: any): ILine;
    prototype: any;
    /**
     * Constructor
     * @param {Array} [points] Array of points
     * @param {Object} [options] Options object
     */
    new (points?: number[], objObjects?: IObjectOptions): ILine;
  }

  interface IObjectOptions {
    /**
     * Type of an object (rect, circle, path, etc.).
     * Note that this property is meant to be read-only and not meant to be modified.
     * If you modify, certain parts of Fabric (such as JSON loading) won't work correctly.
     */
    type?: string;

    /**
     * Horizontal origin of transformation of an object (one of "left", "right", "center") 
     */
    originX?: string;

    /**
     * Vertical origin of transformation of an object (one of "top", "bottom", "center") 
     */
    originY?: string;

    /**
     * Top position of an object. Note that by default it's relative to object center. You can change this by setting originY={top/center/bottom} 
     */
    top?: number;

    /**
     * Left position of an object. Note that by default it's relative to object center. You can change this by setting originX={left/center/right} 
     */
    left?: number;

    /**
     * Object width 
     */
    width?: number;

    /**
     * Object height 
     */
    height?: number;

    /**
     * Object scale factor (horizontal) 
     */
    scaleX?: number;

    /**
     * Object scale factor (vertical) 
     */
    scaleY?: number;

    /**
     * When true, an object is rendered as flipped horizontally 
     */
    flipX?: boolean;

    /**
     * When true, an object is rendered as flipped vertically 
     */
    flipY?: boolean;

    /**
     * Opacity of an object 
     */
    opacity?: number;

    /**
     * Angle of rotation of an object (in degrees)   
     */
    angle?: number;

    /**
     * Size of object's controlling corners (in pixels)   
     */
    cornerSize?: number;

    /**
     * When true, object's controlling corners are rendered as transparent inside (i.e. stroke instead of fill)  
     */
    transparentCorners?: boolean;

    /**
     * Default cursor value used when hovering over this object on canvas   
     */
    hoverCursor?: string;

    /**
     * Padding between object and its controlling borders (in pixels)   
     */
    padding?: number;

    /**
     * Color of controlling borders of an object (when it's active)   
     */
    borderColor?: string;

    /**
     * Color of controlling corners of an object (when it's active)   
     */
    cornerColor?: string;

    /**
     * When true, this object will use center point as the origin of transformation
     * when being scaled via the controls.
     * <b>Backwards incompatibility note:</b> This property replaces "centerTransform" (Boolean).
     */
    centeredScaling?: boolean;

    /**
     * When true, this object will use center point as the origin of transformation
     * when being rotated via the controls.
     * <b>Backwards incompatibility note:</b> This property replaces "centerTransform" (Boolean).
     */
    centeredRotation?: boolean;

    /**
     * Color of object's fill  
     */
    fill?: string;

    /**
     * Fill rule used to fill an object
     * accepted values are nonzero, evenodd
     * Backwards incompatibility note: This property was used for setting globalCompositeOperation until v1.4.12, use `globalCompositeOperation` instead
     */
    fillRule?: string;

    /**
     * Composite rule used for canvas globalCompositeOperation   
     */
    globalCompositeOperation?: string;

    /**
     * Background color of an object. Only works with text objects at the moment. 
     */
    backgroundColor?: string;

    /**
     * When defined, an object is rendered via stroke and this property specifies its color   
     */
    stroke?: string;

    /**
     * Width of a stroke used to render this object  
     */
    strokeWidth?: number;

    /**
     * Array specifying dash pattern of an object's stroke (stroke must be defined)   
     */
    strokeDashArray?: any[];

    /**
     * Line endings style of an object's stroke (one of "butt", "round", "square") 
     */
    strokeLineCap?: string;

    /**
     * Corner style of an object's stroke (one of "bevil", "round", "miter")   
     */
    strokeLineJoin?: string;

    /**
     * Maximum miter length (used for strokeLineJoin = "miter") of an object's stroke 
     */
    strokeMiterLimit?: number;

    /**
     * Shadow object representing shadow of this shape 
     */
    shadow?: IShadow|string;

    /**
     * Opacity of object's controlling borders when object is active and moving 
     */
    borderOpacityWhenMoving?: number;

    /**
     * Scale factor of object's controlling borders 
     */
    borderScaleFactor?: number;

    /**
     * Transform matrix (similar to SVG's transform matrix) 
     */
    transformMatrix?: any[];

    /**
     * Minimum allowed scale value of an object 
     */
    minScaleLimit?: number;

    /**
     * When set to `false`, an object can not be selected for modification (using either point-click-based or group-based selection).
     * But events still fire on it.
     */
    selectable?: boolean;

    /**
     * When set to `false`, an object can not be a target of events. All events propagate through it. Introduced in v1.3.4 
     */
    evented?: boolean;

    /**
     * When set to `false`, an object is not rendered on canvas 
     */
    visible?: boolean;

    /**
     * When set to `false`, object's controls are not displayed and can not be used to manipulate object 
     */
    hasControls?: boolean;

    /**
     * When set to `false`, object's controlling borders are not rendered 
     */
    hasBorders?: boolean;

    /**
     * When set to `false`, object's controlling rotating point will not be visible or selectable 
     */
    hasRotatingPoint?: boolean;

    /**
     * Offset for object's controlling rotating point (when enabled via `hasRotatingPoint`) 
     */
    rotatingPointOffset?: number;

    /**
     * When set to `true`, objects are "found" on canvas on per-pixel basis rather than according to bounding box 
     */
    perPixelTargetFind?: boolean;

    /**
     * When `false`, default object's values are not included in its serialization 
     */
    includeDefaultValues?: boolean;

    /**
     * Function that determines clipping of an object (context is passed as a first argument)
     * Note that context origin is at the object's center point (not left/top corner)
     * @type Function
     */
    clipTo?: Function;

    /**
     * When `true`, object horizontal movement is locked 
     */
    lockMovementX?: boolean;

    /**
     * When `true`, object vertical movement is locked 
     */
    lockMovementY?: boolean;

    /**
     * When `true`, object rotation is locked 
     */
    lockRotation?: boolean;

    /**
     * When `true`, object horizontal scaling is locked 
     */
    lockScalingX?: boolean;

    /**
     * When `true`, object vertical scaling is locked 
     */
    lockScalingY?: boolean;

    /**
     * When `true`, object non-uniform scaling is locked 
     */
    lockUniScaling?: boolean;

    /**
     * When `true`, object cannot be flipped by scaling into negative values 
     */
    lockScalingFlip?: boolean;

    /**
     * Not used by fabric, just for convenience 
     */
    name?: string;

    /**
     * Not used by fabric, just for convenience 
     */
    data?: any;
  }
  interface IObject extends IObservable<IObject>, IObjectOptions, IObjectAnimation<IObject> {
    getCurrentWidth(): number;
    getCurrentHeight(): number;

    getAngle(): number;
    setAngle(value: number): IObject;

    getBorderColor(): string;
    setBorderColor(value: string): IObject;

    getBorderScaleFactor(): number;

    getCornersize(): number;
    setCornersize(value: number): IObject;

    getFill(): string;
    setFill(value: string): IObject;

    getFillRule(): string;
    setFillRule(value: string): IObject;

    getFlipX(): boolean;
    setFlipX(value: boolean): IObject;

    getFlipY(): boolean;
    setFlipY(value: boolean): IObject;

    getHeight(): number;
    setHeight(value: number): IObject;

    getLeft(): number;
    setLeft(value: number): IObject;

    getOpacity(): number;
    setOpacity(value: number): IObject;

    overlayFill: string;
    getOverlayFill(): string;
    setOverlayFill(value: string): IObject;

    getScaleX(): number;
    setScaleX(value: number): IObject;

    getScaleY(): number;
    setScaleY(value: number): IObject;

    setShadow(options: any): IObject;
    getShadow(): IObject;

    stateProperties: any[];
    getTop(): number;
    setTop(value: number): IObject;

    getWidth(): number;
    setWidth(value: number): IObject;

    /* * Sets object's properties from options
     * @param {Object} [options] Options object
     */
    setOptions(options: any): void;

    /**
     * Transforms context when rendering an object
     * @param {CanvasRenderingContext2D} ctx Context
     * @param {Boolean} fromLeft When true, context is transformed to object's top/left corner. This is used when rendering text on Node
     */
    transform(ctx: CanvasRenderingContext2D, fromLeft: boolean): void;

    /**
     * Returns an object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    toObject(propertiesToInclude?: any[]): any;

    /**
     * Returns (dataless) object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    toDatalessObject(propertiesToInclude?: any[]): any;

    /**
     * Returns a string representation of an instance 
     */
    toString(): string;

    /**
     * Basic getter
     * @param {String} property Property name
     */
    get(property: string): any;

    /**
     * Sets property to a given value. 
     * When changing position/dimension -related properties (left, top, scale, angle, etc.) `set` does not update position of object's borders/controls.
     * If you need to update those, call `setCoords()`.
     * @param {String} key Property name 
     * @param {Object|Function} value Property value (if function, the value is passed into it and its return value is used as a new one)
     */
    set(key: string, value: any|Function): IObject;
     /**
     * Sets property to a given value. 
     * When changing position/dimension -related properties (left, top, scale, angle, etc.) `set` does not update position of object's borders/controls.
     * If you need to update those, call `setCoords()`.
     * @param Object key Property object, iterate over the object properties
     */
    set(key: any): IObject;

    /**
     * Toggles specified property from `true` to `false` or from `false` to `true`
     * @param {String} property Property to toggle
     */
    toggle(property: string): IObject;

    /**
     * Sets sourcePath of an object
     * @param {String} value Value to set sourcePath to
     */
    setSourcePath(value: string): IObject;

    /**
     * Retrieves viewportTransform from Object's canvas if possible
     */
    getViewportTransform(): boolean;

    /**
     * Renders an object on a specified context
     * @param {CanvasRenderingContext2D} ctx Context to render on
     * @param {Boolean} [noTransform] When true, context is not transformed
     */
    render(ctx: CanvasRenderingContext2D, noTransform?: boolean): void;

    /**
     * Clones an instance
     * @param {Function} callback Callback is invoked with a clone as a first argument
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    clone(callback: Function, propertiesToInclude?: any[]): IObject;

    /**
     * Creates an instance of fabric.Image out of an object
     * @param {Function} callback callback, invoked with an instance as a first argument
     */
    cloneAsImage(callback: (image: IImage) => any): IObject;

    /**
     * Converts an object into a data-url-like string
     * @param options Options object
     */
    toDataURL(options: IDataURLOptions): string;

    /**
     * Returns true if specified type is identical to the type of an instance
     * @param {String} type Type to check against
     */
    isType(type: string): boolean;

    /**
     * Returns complexity of an instance
     */
    complexity(): number;

    /**
     * Returns a JSON representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    toJSON(propertiesToInclude?: any[]): any;

    /**
     * Sets gradient (fill or stroke) of an object
     * <b>Backwards incompatibility note:</b> This method was named "setGradientFill" until v1.1.0
     * @param {String} property Property name 'stroke' or 'fill'
     * @param {Object} [options] Options object
     */
    setGradient(property: string, options: IGradientOptions): IObject;
    /**
     * Sets pattern fill of an object
     * @param {Object} options Options object
     */
    setPatternFill(options: IFillOptions): IObject;

    /**
     * Sets shadow of an object
     * @param {String} [options] Options object or string (e.g. "2px 2px 10px rgba(0,0,0,0.2)")
     */
    setShadow(options?: string): IObject;
    /**
     * Sets shadow of an object
     * @param [options] Options object
     */
    setShadow(options: IShadow): IObject;

    /**
     * Sets "color" of an instance (alias of `set('fill', …)`)
     * @param {String} color Color value
     */
    setColor(color: string): IObject;

    /**
     * Sets "angle" of an instance
     * @param {Number} angle Angle value
     */
    setAngle(angle: number): IObject;

    /**
     * Sets "angle" of an instance
     * @param {Number} angle Angle value
     */
    rotate(angle: number): IObject;

    /**
     * Centers object horizontally on canvas to which it was added last.
     * You might need to call `setCoords` on an object after centering, to update controls area.
     */
    centerH(): void;

    /**
     * Centers object vertically on canvas to which it was added last.
     * You might need to call `setCoords` on an object after centering, to update controls area.
     */
    centerV(): void;

    /**
     * Centers object vertically and horizontally on canvas to which is was added last
     * You might need to call `setCoords` on an object after centering, to update controls area.
     */
    center(): void;

    /**
     * Removes object from canvas to which it was added last
     */
    remove(): IObject;

    /**
     * Returns coordinates of a pointer relative to an object
     * @param {Event} e Event to operate upon
     * @param {Object} [pointer] Pointer to operate upon (instead of event)
     */
    getLocalPointer(e: Event, pointer: any): any;

    /**
     * Sets object's properties from options
     * @param {Object} [options] Options object
     */
    setOptions(options: any): void;
    /**
     * Sets sourcePath of an object
     * @param {String} value Value to set sourcePath to
     */
    setSourcePath(value: string): IObject;
    // functions from object svg export mixin
    // -----------------------------------------------------------------------------------------------------------------------------------
    /**
     * Returns styles-string for svg-export
     */
    getSvgStyles(): string;
    /**
     * Returns transform-string for svg-export
     */
    getSvgTransform(): string;
    /**
     * Returns transform-string for svg-export from the transform matrix of single elements
     */
    getSvgTransformMatrix(): string;

    // functions from stateful mixin
    // -----------------------------------------------------------------------------------------------------------------------------------
    /**
     * Returns true if object state (one of its state properties) was changed
     */
    hasStateChanged(): boolean;
    /**
     * Saves state of an object
     * @param {Object} [options] Object with additional `stateProperties` array to include when saving state
     * @return {fabric.Object} thisArg
     */
    saveState(options?: { stateProperties: any[] }): IObject;
    /**
     * Setups state of an object
     */
    setupState(): IObject;
    // functions from object straightening mixin
    // -----------------------------------------------------------------------------------------------------------------------------------
    /**
     * Straightens an object (rotating it from current angle to one of 0, 90, 180, 270, etc. depending on which is closer)
     */
    straighten(): IObject;
    /**
     * Same as straighten but with animation
     * @param {Object} callbacks Object with callback functions
     * @param {Function} [callbacks.onComplete] Invoked on completion
     * @param {Function} [callbacks.onChange] Invoked on every step of animation
     */
    fxStraighten(callbacks: { onComplete?: Function; onChange: Function }): IObject;

    // functions from object stacking mixin
    // -----------------------------------------------------------------------------------------------------------------------------------
    /**
     * Moves an object up in stack of drawn objects
     * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object
     */
    bringForward(intersecting?: boolean): IObject;
    /**
     * Moves an object to the top of the stack of drawn objects
     */
    bringToFront(): IObject;
    /**
     * Moves an object down in stack of drawn objects
     * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object
     */
    sendBackwards(intersecting?: boolean): IObject;
    /**
     * Moves an object to the bottom of the stack of drawn objects
     */
    sendToBack(): IObject;
    /**
     * Moves an object to specified level in stack of drawn objects
     * @param {Number} index New position of object
     */
    moveTo(index: number): IObject;

    // functions from object origin mixin
    // -----------------------------------------------------------------------------------------------------------------------------------
    /**
     * Translates the coordinates from origin to center coordinates (based on the object's dimensions)
     * @param {fabric.Point} point The point which corresponds to the originX and originY params
     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
     */
    translateToCenterPoint(point: IPoint, originX: string, originY: string): IPoint;

    /**
     * Translates the coordinates from center to origin coordinates (based on the object's dimensions)
     * @param {fabric.Point} center The point which corresponds to center of the object
     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
     */
    translateToOriginPoint(center: IPoint, originX: string, originY: string): IPoint;
    /**
     * Returns the real center coordinates of the object
     */
    getCenterPoint(): IPoint;

    /**
     * Returns the coordinates of the object as if it has a different origin
     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
     */
    getPointByOrigin(): IPoint;

    /**
     * Returns the point in local coordinates
     * @param {fabric.Point} point The point relative to the global coordinate system
     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
     */
    toLocalPoint(point: IPoint, originX: string, originY: string): IPoint;

    /**
     * Sets the position of the object taking into consideration the object's origin
     * @param {fabric.Point} pos The new position of the object
     * @param {String} originX Horizontal origin: 'left', 'center' or 'right'
     * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'
     * @return {void}
     */
    setPositionByOrigin(pos: IPoint, originX: string, originY: string): void;

    /**
     * @param {String} to One of 'left', 'center', 'right'
     */
    adjustPosition(to: string): void;

    // functions from interactivity mixin
    // -----------------------------------------------------------------------------------------------------------------------------------
    /**-
     * Draws borders of an object's bounding box.
     * Requires public properties: width, height
     * Requires public options: padding, borderColor
     * @param {CanvasRenderingContext2D} ctx Context to draw on
     */
    drawBorders(context: CanvasRenderingContext2D): IObject;

    /**
     * Draws corners of an object's bounding box.
     * Requires public properties: width, height
     * Requires public options: cornerSize, padding
     * @param {CanvasRenderingContext2D} ctx Context to draw on
     */
    drawCorners(context: CanvasRenderingContext2D): IObject;

    /**
     * Returns true if the specified control is visible, false otherwise.
     * @param {String} controlName The name of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.
     */
    isControlVisible(controlName: string): boolean;
    /**
     * Sets the visibility of the specified control.
     * @param {String} controlName The name of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.
     * @param {Boolean} visible true to set the specified control visible, false otherwise
     */
    setControlVisible(controlName: string, visible: boolean): IObject;

    /**
     * Sets the visibility state of object controls.
     * @param {Object} [options] Options object
     */
    setControlsVisibility(options?: {
      bl?: boolean;
      br?: boolean;
      mb?: boolean;
      ml?: boolean;
      mr?: boolean;
      mt?: boolean;
      tl?: boolean;
      tr?: boolean;
      mtr?: boolean; }): IObject;

    // functions from geometry mixin
    // -------------------------------------------------------------------------------------------------------------------------------
    /**
     * Sets corner position coordinates based on current angle, width and height
     * See https://github.com/kangax/fabric.js/wiki/When-to-call-setCoords
     */
    setCoords(): IObject;
    /**
     * Returns coordinates of object's bounding rectangle (left, top, width, height)
     * @return {Object} Object with left, top, width, height properties
     */
    getBoundingRect(): { left: number; top: number; width: number; height: number };
    /**
     * Checks if object is fully contained within area of another object
     * @param {Object} other Object to test
     */
    isContainedWithinObject(other: IObject): boolean;
    /**
     * Checks if object is fully contained within area formed by 2 points
     * @param {Object} pointTL top-left point of area
     * @param {Object} pointBR bottom-right point of area
     */
    isContainedWithinRect(pointTL: any, pointBR: any): boolean;
    /**
     * Checks if point is inside the object
     * @param {fabric.Point} point Point to check against
     */
    containsPoint(point: IPoint): boolean;
    /**
     * Scales an object (equally by x and y)
     * @param {Number} value Scale factor
     * @return {fabric.Object} thisArg
     */
    scale(value: number): IObject;
    /**
     * Scales an object to a given height, with respect to bounding box (scaling by x/y equally)
     * @param {Number} value New height value
     */
    scaleToHeight(value: number): IObject;
    /**
     * Scales an object to a given width, with respect to bounding box (scaling by x/y equally)
     * @param {Number} value New width value
     */
    scaleToWidth(value: number): IObject;
    /**
     * Checks if object intersects with another object
     * @param {Object} other Object to test
     */
    intersectsWithObject(other: IObject): boolean;
    /**
     * Checks if object intersects with an area formed by 2 points
     * @param {Object} pointTL top-left point of area
     * @param {Object} pointBR bottom-right point of area
     */
    intersectsWithRect(pointTL: any, pointBR: any): boolean;
  }
  interface IObjectStatic {
    prototype: any;
  }

  interface IPathOptions extends IObjectOptions {
    /**
     * Array of path points
     */
    path?: any[];

    /**
     * Minimum X from points values, necessary to offset points
     */
    minX?: number;

    /**
     * Minimum Y from points values, necessary to offset points
     */
    minY?: number;
  }
  interface IPath extends IObject, IPathOptions {
    initialize(path?: any[], options?: IPathOptions): IPath;

    /**
     * Returns number representation of an instance complexity
     * @return {Number} complexity of this instance
     */
    complexity(): number;

    /**
     * Renders path on a specified context
     * @param {CanvasRenderingContext2D} ctx context to render path on
     * @param {Boolean} [noTransform] When true, context is not transformed
     */
    render(ctx: CanvasRenderingContext2D, noTransform: boolean): void;
    /**
     * Returns dataless object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toDatalessObject(propertiesToInclude?: any[]): any;
    /**
     * Returns object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toObject(propertiesToInclude?: any[]): any;
    /**
     * Returns string representation of an instance
     * @return {String} string representation of an instance
     */
    toString(): string;
    /**
     * Returns svg representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
  }
  interface IPathStatic {
    /**
     * Creates an instance of fabric.Path from an SVG <path> element
     * @param {SVGElement} element to parse
     * @param {Function} callback Callback to invoke when an fabric.Path instance is created
     * @param {Object} [options] Options object
     */
    fromElement(element: SVGElement, callback: (path: IPath) => any, options?: IPathOptions): void;
    /**
     * Creates an instance of fabric.Path from an object
     * @param {Object} object
     * @param {Function} callback Callback to invoke when an fabric.Path instance is created
     */
    fromObject(object: any, callback: (path: IPath) => any): void;
    /**
     * Constructor
     * @param {Array|String} path Path data (sequence of coordinates and corresponding "command" tokens)
     * @param {Object} [options] Options object
     */
    new (path?: string|any[], options?: IPathOptions): IPath;
  }

  interface IPathGroup extends IObject {
    initialize(paths: IPath[], options?: IObjectOptions): void;
    /**
     * Returns number representation of object's complexity
     * @return {Number} complexity
     */
    complexity(): number;
    /**
     * Returns true if all paths in this group are of same color
     * @return {Boolean} true if all paths are of the same color (`fill`)
     */
    isSameColor(): boolean;
    /**
     * Renders this group on a specified context
     * @param {CanvasRenderingContext2D} ctx Context to render this instance on
     */
    render(ctx: CanvasRenderingContext2D): void;
    /**
     * Returns dataless object representation of this path group
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} dataless object representation of an instance
     */
    toDatalessObject(propertiesToInclude?: any[]): any;
    /**
     * Returns object representation of this path group
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toObject(propertiesToInclude?: any[]): any;
    /**
     * Returns a string representation of this path group
     * @return {String} string representation of an object
     */
    toString(): string;
    /**
     * Returns svg representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
    /**
     * Returns all paths in this path group
     * @return {Array} array of path objects included in this path group
     */
    getObjects(): IPath[];
  }
  interface IPathGroupStatic {
    fromObject(object: any): IPathGroup;
    /**
     * Constructor
     * @param {Array} paths
     * @param {Object} [options] Options object
     */
    new (paths: IPath[], options?: IObjectOptions): IPathGroup;
    /**
     * Creates fabric.PathGroup instance from an object representation
     * @static
     * @memberOf fabric.PathGroup
     * @param {Object} object Object to create an instance from
     * @param {Function} callback Callback to invoke when an fabric.PathGroup instance is created
     */
    fromObject(object: any, callback: (group: IPathGroup) => any): void;
    prototype: any;
  }

  interface IPolygonOptions extends IObjectOptions {
    /**
     * Points array
     */
    points?: IPoint[];

    /**
     * Minimum X from points values, necessary to offset points
     */
    minX?: number;

    /**
     * Minimum Y from points values, necessary to offset points
     */
    minY?: number;
  }
  interface IPolygon extends IObject, IPolygonOptions {
    /**
     * Returns complexity of an instance
     * @return {Number} complexity of this instance
     */
    complexity(): number;

    /**
     * Returns object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toObject(propertiesToInclude?: any[]): any;
    /**
     * Returns svg representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
  }
  interface IPolygonStatic {
    /**
     * List of attribute names to account for when parsing SVG element (used by `fabric.Polygon.fromElement`)
     */
    ATTRIBUTE_NAMES: string[];

    /**
     * Returns Polygon instance from an SVG element
     * @param {SVGElement} element Element to parse
     * @param {Object} [options] Options object
     */
    fromElement(element: SVGElement, options?: IPolygonOptions): IPolygon;
    /**
     * Returns fabric.Polygon instance from an object representation
     * @param {Object} object Object to create an instance from
     */
    fromObject(object: any): IPolygon;
    /**
     * Constructor
     * @param {Array} points Array of points
     * @param {Object} [options] Options object
     */
    new (points: { x: number; y: number }[], options?: IObjectOptions, skipOffset?: boolean): IPolygon;
    prototype: any;
  }

  interface IPolylineOptions extends IObjectOptions {
    /**
     * Points array
     */
    points?: IPoint[];

    /**
     * Minimum X from points values, necessary to offset points
     */
    minX?: number;

    /**
     * Minimum Y from points values, necessary to offset points
     */
    minY?: number;
  }
  interface IPolyline extends IObject, IPolylineOptions {
    initialize(points: IPoint[], options?: IPolylineOptions): void;
    /**
     * Returns complexity of an instance
     * @return {Number} complexity of this instance
     */
    complexity(): number;
    /**
     * Returns object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} Object representation of an instance
     */
    toObject(propertiesToInclude?: any[]): any;
    /**
     * Returns SVG representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
  }
  interface IPolylineStatic {
    /**
     * List of attribute names to account for when parsing SVG element (used by `fabric.Polygon.fromElement`)
     */
    ATTRIBUTE_NAMES: string[];

    /**
     * Returns Polyline  instance from an SVG element
     * @param {SVGElement} element Element to parse
     * @param {Object} [options] Options object
     */
    fromElement(element: SVGElement, options?: IPolylineOptions): IPolyline;
    /**
     * Returns fabric.Polyline instance from an object representation
     * @param {Object} object Object to create an instance from
     */
    fromObject(object: any): IPolyline;
    /**
     * Constructor
     * @param {Array} points Array of points (where each point is an object with x and y)
     * @param {Object} [options] Options object
     * @param {Boolean} [skipOffset] Whether points offsetting should be skipped
     */
    new (points: { x: number; y: number }[], options?: IPolylineOptions): IPolyline;
    prototype: any;
  }

  interface IRectOptions extends IObjectOptions {
    x?: number;
    y?: number;
    /**
     * Horizontal border radius
     */
    rx?: number;

    /**
     * Vertical border radius
     */
    ry?: number;

  }
  interface IRect extends IObject, IRectOptions {
    initialize(points?: number[], options?: any): IRect;
    /**
     * Returns complexity of an instance
     * @return {Number} complexity
     */
    complexity(): number;
    /**
     * Returns object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toObject(propertiesToInclude: any[]): any;
    /**
     * Returns svg representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
  }
  interface IRectStatic {
    /**
     * List of attribute names to account for when parsing SVG element (used by `fabric.Rect.fromElement`)
     */
    ATTRIBUTE_NAMES: string[];
    /**
     * Returns Rect instance from an SVG element
     * @param {SVGElement} element Element to parse
     * @param {Object} [options] Options object
     */
    fromElement(element: SVGElement, options?: IRectOptions): IRect;
    /**
     * Returns Rect instance from an object representation
     * @param {Object} object Object to create an instance from
     */
    fromObject(object: any): IRect;
    /**
     * Constructor
     * @param {Object} [options] Options object
     */
    new (options?: IRectOptions): IRect;
    prototype: any;
  }

  interface ITextOptions extends IObjectOptions {
    /**
     * Font size (in pixels)
     */
    fontSize?: number;
    /**
     * Font weight (e.g. bold, normal, 400, 600, 800)
     */
    fontWeight?: number|string;
    /**
     * Font family
     */
    fontFamily?: string;
    /**
     * Text decoration Possible values?: "", "underline", "overline" or "line-through".
     */
    textDecoration?: string;
    /**
     * Text alignment. Possible values?: "left", "center", or "right".
     */
    textAlign?: string;
    /**
     * Font style . Possible values?: "", "normal", "italic" or "oblique".
     */
    fontStyle?: string;
    /**
     * Line height
     */
    lineHeight?: number;
    /**
     * When defined, an object is rendered via stroke and this property specifies its color.
     * <b>Backwards incompatibility note?:</b> This property was named "strokeStyle" until v1.1.6
     */
    stroke?: string;
    /**
     * Shadow object representing shadow of this shape.
     * <b>Backwards incompatibility note?:</b> This property was named "textShadow" (String) until v1.2.11
     */
    shadow?: IShadow|string;
    /**
     * Background color of text lines
     */
    textBackgroundColor?: string;

    path?: string;
    useNative?: Boolean;
    text?: string;
  }
  interface IText extends IObject, ITextOptions {
    /**
     * Returns complexity of an instance
     */
    complexity(): number;
    /**
     * Returns string representation of an instance
     */
    toString(): string;
    /**
     * Renders text instance on a specified context
     * @param {CanvasRenderingContext2D} ctx Context to render on
     */
    render(ctx: CanvasRenderingContext2D, noTransform: boolean): void;
    /**
     * Returns object representation of an instance
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     */
    toObject(propertiesToInclude?: any[]): IObject;
    /**
     * Returns SVG representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     */
    toSVG(reviver?: Function): string;
    /**
     * Retrieves object's fontSize
     */
    getFontSize(): number;
    /**
     * Sets object's fontSize
     * @param {Number} fontSize Font size (in pixels)
     */
    setFontSize(fontSize: number): IText;
    /**
     * Retrieves object's fontWeight
     */
    getFontWeight(): number|string;
    /**
     * Sets object's fontWeight
     * @param {(Number|String)} fontWeight Font weight
     */
    setFontWeight(fontWeight: string|number): IText;
    /**
     * Retrieves object's fontFamily
     */
    getFontFamily(): string;
    /**
     * Sets object's fontFamily
     * @param {String} fontFamily Font family
     */
    setFontFamily(fontFamily: string): IText;
    /**
     * Retrieves object's text
     */
    getText(): string;
    /**
     * Sets object's text
     * @param {String} text Text
     */
    setText(text: string): IText;
    /**
     * Retrieves object's textDecoration
     */
    getTextDecoration(): string;
    /**
     * Sets object's textDecoration
     * @param {String} textDecoration Text decoration
     */
    setTextDecoration(textDecoration: string): IText;
    /**
     * Retrieves object's fontStyle
     */
    getFontStyle(): string;
    /**
     * Sets object's fontStyle
     * @param {String} fontStyle Font style
     */
    setFontStyle(fontStyle: string): IText;
    /**
     * Retrieves object's lineHeight
     */
    getLineHeight(): number;
    /**
     * Sets object's lineHeight
     * @param {Number} lineHeight Line height
     */
    setLineHeight(lineHeight: number): IText;
    /**
     * Retrieves object's textAlign
     */
    getTextAlign(): string;
    /**
     * Sets object's textAlign
     * @param {String} textAlign Text alignment
     */
    setTextAlign(textAlign: string): IText;
    /**
     * Retrieves object's textBackgroundColor
     */
    getTextBackgroundColor(): string;
    /**
     * Sets object's textBackgroundColor
     * @param {String} textBackgroundColor Text background color
     */
    setTextBackgroundColor(textBackgroundColor: string): IText;
  }
  interface ITextStatic {
    /**
     * List of attribute names to account for when parsing SVG element (used by `fabric.Text.fromElement`)
     */
    ATTRIBUTE_NAMES: string[];
    /**
     * Default SVG font size
     */
    DEFAULT_SVG_FONT_SIZE: number;
    /**
     * Constructor
     * @param {String} text Text string
     * @param {Object} [options] Options object
     */
    new (text: string, options?: ITextOptions): IText;

    /**
     * Returns fabric.Text instance from an SVG element (<b>not yet implemented</b>)
     * @param {SVGElement} element Element to parse
     * @param {Object} [options] Options object
     */
    fromElement(element: SVGElement, options?: ITextOptions): IText;
    /**
     * Returns fabric.Text instance from an object representation
     * @param {Object} object Object to create an instance from
     */
    fromObject(object: any): IText;
  }

  interface IITextOptions extends IObjectOptions, ITextOptions {
    /**
     * Index where text selection starts (or where cursor is when there is no selection)
     */
    selectionStart?: number;

    /**
     * Index where text selection ends
     */
    selectionEnd?: number;

    /**
     * Color of text selection
     */
    selectionColor?: string;

    /**
     * Indicates whether text is in editing mode
     */
    isEditing?: boolean;

    /**
     * Indicates whether a text can be edited
     */
    editable?: boolean;

    /**
     * Border color of text object while it's in editing mode
     */
    editingBorderColor?: string;

    /**
     * Width of cursor (in px)
     */
    cursorWidth?: number;

    /**
     * Color of default cursor (when not overwritten by character style)
     */
    cursorColor?: string;

    /**
     * Delay between cursor blink (in ms)
     */
    cursorDelay?: number;

    /**
     * Duration of cursor fadein (in ms)
     */
    cursorDuration?: number;

    /**
     * Object containing character styles
     * (where top-level properties corresponds to line number and 2nd-level properties -- to char number in a line)
     */
    styles?: any;

    /**
     * Indicates whether internal text char widths can be cached
     */
    caching?: boolean;
  }
  interface IIText extends IObject, IText, IITextOptions {
    /**
     * Returns true if object has no styling
     */
    isEmptyStyles(): boolean;
    render(ctx: CanvasRenderingContext2D, noTransform: boolean): void;
    /**
     * Returns object representation of an instance
     * @method toObject
     * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output
     * @return {Object} object representation of an instance
     */
    toObject(propertiesToInclude?: any[]): IObject;

    setText(value: string): IText;
    /**
     * Sets selection start (left boundary of a selection)
     * @param {Number} index Index to set selection start to
     */
    setSelectionStart(index: number): void;
    /**
     * Sets selection end (right boundary of a selection)
     * @param {Number} index Index to set selection end to
     */
    setSelectionEnd(index: number): void;
    /**
     * Gets style of a current selection/cursor (at the start position)
     * @param {Number} [startIndex] Start index to get styles at
     * @param {Number} [endIndex] End index to get styles at
     * @return {Object} styles Style object at a specified (or current) index
     */
    getSelectionStyles(startIndex: number, endIndex: number): any;
    /**
     * Sets style of a current selection
     * @param {Object} [styles] Styles object
     * @return {fabric.IText} thisArg
     * @chainable
     */
    setSelectionStyles(styles: any): IText;

    /**
     * Renders cursor or selection (depending on what exists)
     */
    renderCursorOrSelection(): void;

    /**
     * Returns 2d representation (lineIndex and charIndex) of cursor (or selection start)
     * @param {Number} [selectionStart] Optional index. When not given, current selectionStart is used.
     */
    get2DCursorLocation(selectionStart?: number): void;
    /**
     * Returns complete style of char at the current cursor
     * @param {Number} lineIndex Line index
     * @param {Number} charIndex Char index
     * @return {Object} Character style
     */
    getCurrentCharStyle(lineIndex: number, charIndex: number): any;

    /**
     * Returns fontSize of char at the current cursor
     * @param {Number} lineIndex Line index
     * @param {Number} charIndex Char index
     * @return {Number} Character font size
     */
    getCurrentCharFontSize(lineIndex: number, charIndex: number): number;

    /**
     * Returns color (fill) of char at the current cursor
     * @param {Number} lineIndex Line index
     * @param {Number} charIndex Char index
     * @return {String} Character color (fill)
     */
    getCurrentCharColor(lineIndex: number, charIndex: number): string;
    /**
     * Renders cursor
     * @param {Object} boundaries
     */
    renderCursor(boundaries: any): void;

    /**
     * Renders text selection
     * @param {Array} chars Array of characters
     * @param {Object} boundaries Object with left/top/leftOffset/topOffset
     */
    renderSelection(chars: string[], boundaries: any): void;

    // functions from itext behavior mixin
    // ------------------------------------------------------------------------------------------------------------------------
    /**
     * Initializes all the interactive behavior of IText
     */
    initBehavior(): void;

    /**
     * Initializes "selected" event handler
     */
    initSelectedHandler(): void;

    /**
     * Initializes "added" event handler
     */
    initAddedHandler(): void;

    initRemovedHandler(): void;

    /**
     * Initializes delayed cursor
     */
    initDelayedCursor(restart: boolean): void;

    /**
     * Aborts cursor animation and clears all timeouts
     */
    abortCursorAnimation(): void;

    /**
     * Selects entire text
     */
    selectAll(): void;

    /**
     * Returns selected text
     */
    getSelectedText(): string;

    /**
     * Find new selection index representing start of current word according to current selection index
     * @param {Number} startFrom Surrent selection index
     * @return {Number} New selection index
     */
    findWordBoundaryLeft(startFrom: number): number;

    /**
     * Find new selection index representing end of current word according to current selection index
     * @param {Number} startFrom Current selection index
     * @return {Number} New selection index
     */
    findWordBoundaryRight(startFrom: number): number;

    /**
     * Find new selection index representing start of current line according to current selection index
     * @param {Number} startFrom Current selection index
     */
    findLineBoundaryLeft(startFrom: number): number;

    /**
     * Find new selection index representing end of current line according to current selection index
     * @param {Number} startFrom Current selection index
     */
    findLineBoundaryRight(startFrom: number): number;

    /**
     * Returns number of newlines in selected text
     */
    getNumNewLinesInSelectedText(): number;

    /**
     * Finds index corresponding to beginning or end of a word
     * @param {Number} selectionStart Index of a character
     * @param {Number} direction: 1 or -1
     */
    searchWordBoundary(selectionStart: number, direction: number): number;

    /**
     * Selects a word based on the index
     * @param {Number} selectionStart Index of a character
     */
    selectWord(selectionStart: number): void;
    /**
     * Selects a line based on the index
     * @param {Number} selectionStart Index of a character
     */
    selectLine(selectionStart: number): void;

    /**
     * Enters editing state
     */
    enterEditing(): IIText;

    /**
     * Initializes "mousemove" event handler
     */
    initMouseMoveHandler(): void;
    /**
     * Exits from editing state
     * @return {fabric.IText} thisArg
     * @chainable
     */
    exitEditing(): IIText;

    /**
     * Inserts a character where cursor is (replacing selection if one exists)
     * @param {String} _chars Characters to insert
     */
    insertChars(_chars: string, useCopiedStyle?: boolean): void;
    /**
     * Inserts new style object
     * @param {Number} lineIndex Index of a line
     * @param {Number} charIndex Index of a char
     * @param {Boolean} isEndOfLine True if it's end of line
     */
    insertNewlineStyleObject(lineIndex: number, charIndex: number, isEndOfLine: boolean): void;

    /**
     * Inserts style object for a given line/char index
     * @param {Number} lineIndex Index of a line
     * @param {Number} charIndex Index of a char
     * @param {Object} [style] Style object to insert, if given
     */
    insertCharStyleObject(lineIndex: number, charIndex: number, isEndOfLine: boolean): void;

    /**
     * Inserts style object(s)
     * @param {String} _chars Characters at the location where style is inserted
     * @param {Boolean} isEndOfLine True if it's end of line
     * @param {Boolean} [useCopiedStyle] Style to insert
     */
    insertStyleObjects(_chars: string, isEndOfLine: boolean, useCopiedStyle?: boolean): void;

    /**
     * Shifts line styles up or down
     * @param {Number} lineIndex Index of a line
     * @param {Number} offset Can be -1 or +1
     */
    shiftLineStyles(lineIndex: number, offset: number): void;

    /**
     * Removes style object
     * @param {Boolean} isBeginningOfLine True if cursor is at the beginning of line
     * @param {Number} [index] Optional index. When not given, current selectionStart is used.
     */
    removeStyleObject(isBeginningOfLine: boolean, index?: number): void;
    /**
     * Inserts new line
     */
    insertNewline(): void;

  }
  interface IITextStatic extends ITextStatic {
    /**
     * Constructor
     * @param {String} text Text string
     * @param {Object} [options] Options object
     */
    new (text: string, options?: IITextOptions): IIText;
    /**
     * Returns fabric.IText instance from an object representation
     * @param {Object} object Object to create an instance from
     */
    fromObject(object: any): IIText;
  }

  interface ITriangleOptions extends IObjectOptions { }
  interface ITriangle extends IObject {
    /**
     * Returns complexity of an instance
     * @return {Number} complexity of this instance
     */

    complexity(): number;
    /**
     * Returns SVG representation of an instance
     * @param {Function} [reviver] Method for further parsing of svg representation.
     * @return {String} svg representation of an instance
     */
    toSVG(reviver?: Function): string;
  }
  interface ITriangleStatic {
    /**
     * Constructor
     * @param {Object} [options] Options object
     */
    new (options?: ITriangleOptions): ITriangle;
    /**
     * Returns Triangle instance from an object representation
     * @param {Object} object Object to create an instance from
     */
    fromObject(object: any): ITriangle;
  }

  ////////////////////////////////////////////////////////////
  // Filters
  ////////////////////////////////////////////////////////////
  interface IAllFilters {
    BaseFilter: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       */
      new (options?: any): IBaseFilter;
    };
    Blend: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       */
      new (options?: { color?: string; mode?: string; alpha?: number; image?: IImage }): IBlendFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IBlendFilter
    };
    Brightness: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       * @param {Number} [options.brightness=0] Value to brighten the image up (0..255)
       */
      new (options?: { brightness: number }): IBrightnessFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IBrightnessFilter
    };
    Convolute: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       * @param {Boolean} [options.opaque=false] Opaque value (true/false)
       * @param {Array} [options.matrix] Filter matrix
       */
      new (options?: { opaque?: boolean; matrix?: number[] }): IConvoluteFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IConvoluteFilter
    };
    GradientTransparency: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       * @param {Number} [options.threshold=100] Threshold value
       */
      new (options?: { threshold?: number; }): IGradientTransparencyFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IGradientTransparencyFilter
    };
    Grayscale: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       */
      new (options?: any): IGrayscaleFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IGrayscaleFilter
    };
    Invert: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       */
      new (options?: any): IInvertFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IInvertFilter
    };
    Mask: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       * @param {fabric.Image} [options.mask] Mask image object
       * @param {Number} [options.channel=0] Rgb channel (0, 1, 2 or 3)
       */
      new (options?: { mask?: IImage; channel: number; }): IMaskFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IMaskFilter
    };
    Multiply: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       * @param {Number} [options.color=#000000] Color to multiply the image pixels with
       */
      new (options?: { color: string; }): IMultiplyFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IMultiplyFilter
    };
    Noise: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       * @param {Number} [options.noise=0] Noise value
       */
      new (options?: { noise: number; }): INoiseFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): INoiseFilter
    };
    Pixelate: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       * @param {Number} [options.blocksize=4] Blocksize for pixelate
       */
      new (options?: { blocksize?: number; }): IPixelateFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IPixelateFilter
    };
    RemoveWhite: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       * @param {Number} [options.threshold=30] Threshold value
       * @param {Number} [options.distance=20] Distance value
       */
      new (options?: { threshold?: number; distance?: number; }): IRemoveWhiteFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IRemoveWhiteFilter
    };
    Resize: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       */
      new (options?: any): IResizeFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): IResizeFilter
    };
    Sepia2: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       */
      new (options?: any): ISepia2Filter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): ISepia2Filter
    };
    Sepia: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       */
      new (options?: any): ISepiaFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): ISepiaFilter
    };
    Tint: {
      /**
       * Constructor
       * @param {Object} [options] Options object
       * @param {String} [options.color=#000000] Color to tint the image with
       * @param {Number} [options.opacity] Opacity value that controls the tint effect's transparency (0..1)
       */
      new (options?: { color?: string; opacity?: number; }): ITintFilter;
      /**
       * Returns filter instance from an object representation
       * @param {Object} object Object to create an instance from
       */
      fromObject(object: any): ITintFilter
    };
  }
  interface IBaseFilter {
    /**
     * Sets filter's properties from options
     * @param {Object} [options] Options object
     */
    setOptions(options?: any): void;
    /**
     * Returns object representation of an instance
     */
    toObject(): any;
    /**
     * Returns a JSON representation of an instance
     */
    toJSON(): string;
  }
  interface IBlendFilter extends IBaseFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IBrightnessFilter extends IBaseFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IConvoluteFilter extends IBaseFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IGradientTransparencyFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IGrayscaleFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IInvertFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IMaskFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IMultiplyFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface INoiseFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IPixelateFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IRemoveWhiteFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface IResizeFilter {
    /**
     * Resize type
     */
    resizeType: string;

    /**
     * Scale factor for resizing, x axis
     */
    scaleX: number;

    /**
     * Scale factor for resizing, y axis
     */
    scaleY: number;

    /**
     * LanczosLobes parameter for lanczos filter
     */
    lanczosLobes: number;
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface ISepiaFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface ISepia2Filter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }
  interface ITintFilter {
    /**
     * Applies filter to canvas element
     * @param {Object} canvasEl Canvas element to apply filter to
     */
    applyTo(canvasEl: HTMLCanvasElement): void;
  }

  ////////////////////////////////////////////////////////////
  // Brushes
  ////////////////////////////////////////////////////////////
  interface IBaseBrush {
    /**
     * Color of a brush
     */
    color: string;

    /**
     * Width of a brush
     */
    width: number;

    /**
     * Shadow object representing shadow of this shape.
     * <b>Backwards incompatibility note:</b> This property replaces "shadowColor" (String), "shadowOffsetX" (Number),
     * "shadowOffsetY" (Number) and "shadowBlur" (Number) since v1.2.12
     */
    shadow: IShadow|string;
    /**
     * Line endings style of a brush (one of "butt", "round", "square")
     */
    strokeLineCap: string;

    /**
     * Corner style of a brush (one of "bevil", "round", "miter")
     */
    strokeLineJoin: string;

    /**
     * Stroke Dash Array.
     */
    strokeDashArray: any[];

    /**
     * Sets shadow of an object
     * @param {Object|String} [options] Options object or string (e.g. "2px 2px 10px rgba(0,0,0,0.2)")
     */
    setShadow(options: string|any): IBaseBrush;

  }
  interface ICircleBrush extends IBaseBrush {
    /**
     * Width of a brush
     */
    width: number;
    /**
     * Invoked inside on mouse down and mouse move
     * @param {Object} pointer
     */
    drawDot(pointer: any): void;

    /**
     * @param {Object} pointer
     * @return {fabric.Point} Just added pointer point
     */
    addPoint(pointer: any): IPoint
  }
  interface ISprayBrush extends IBaseBrush {
    /**
     * Width of a brush
     */
    width: number;
    /**
     * Density of a spray (number of dots per chunk)
     */
    density: number;

    /**
     * Width of spray dots
     */
    dotWidth: number;
    /**
     * Width variance of spray dots
     */
    dotWidthVariance: number;

    /**
     * Whether opacity of a dot should be random
     */
    randomOpacity: boolean;
    /**
     * Whether overlapping dots (rectangles) should be removed (for performance reasons)
     */
    optimizeOverlapping: boolean;
    /**
     * @param {Object} pointer
     */
    addSprayChunk(pointer: any): void
  }
  interface IPatternBrush extends IPencilBrush {
    getPatternSrc(): HTMLCanvasElement;

    getPatternSrcFunction(): string;

    /**
     * Creates "pattern" instance property
     */
    getPattern(): any;
    /**
     * Creates path
     */
    createPath(pathData: string): IPath;
  }
  interface IPencilBrush extends IBaseBrush {
    /**
     * Converts points to SVG path
     * @param {Array} points Array of points
     * @param {Number} minX
     * @param {Number} minY
     */
    convertPointsToSVGPath(points: { x: number; y: number }[], minX?: number, minY?: number): string[];

    /**
     * Creates fabric.Path object to add on canvas
     * @param {String} pathData Path data
     */
    createPath(pathData: string): IPath;
  }
  var BaseBrush: {
    new (): IBaseBrush
  };
  var CircleBrush: {
    new (canvas: fabric.ICanvas): ICircle
  };
  var SprayBrush: {
    new (canvas: fabric.ICanvas): ISprayBrush
  };
  var PencilBrush: {
    new (canvas: fabric.ICanvas): IPencilBrush
  };
  var PatternBrush: {
    new (canvas: fabric.ICanvas): IPatternBrush
  };
  ///////////////////////////////////////////////////////////////////////////////
  // Fabric util Interface
  //////////////////////////////////////////////////////////////////////////////
  interface IUtilAnimationOptions {
    /**
     * Starting value
     */
    startValue?: number;
    /**
     * Ending value
     */
    endValue?: number;
    /** 
     * Value to modify the property by
     */
    byValue: number;
    /**
     * Duration of change (in ms)
     */
    duration?: number;
    /**
     * Callback; invoked on every value change
     */
    onChange?: Function;
    /**
     * Callback; invoked when value change is completed
     */
    onComplete?: Function;
    /**
     * Easing function
     */
    easing?: Function;
  }
  interface IUtilAnimation {
    /**
     * Changes value from one to another within certain period of time, invoking callbacks as value is being changed.
     * @param {Object} [options] Animation options
     */
    animate(options?: IUtilAnimationOptions): void;
    /**
     * requestAnimationFrame polyfill based on http://paulirish.com/2011/requestanimationframe-for-smart-animating/
     * In order to get a precise start time, `requestAnimFrame` should be called as an entry into the method
     * @param {Function} callback Callback to invoke
     */
    requestAnimFrame(callback: Function): void;
  }

  interface IUtilAminEaseFunction {
    (t: number, b: number, c: number, d: number): number;
  }

  interface IUtilAnimEase {
    easeInBack: IUtilAminEaseFunction;
    easeInBounce: IUtilAminEaseFunction;
    easeInCirc: IUtilAminEaseFunction;
    easeInCubic: IUtilAminEaseFunction;
    easeInElastic: IUtilAminEaseFunction;
    easeInExpo: IUtilAminEaseFunction;
    easeInOutBack: IUtilAminEaseFunction;
    easeInOutBounce: IUtilAminEaseFunction;
    easeInOutCirc: IUtilAminEaseFunction;
    easeInOutCubic: IUtilAminEaseFunction;
    easeInOutElastic: IUtilAminEaseFunction;
    easeInOutExpo: IUtilAminEaseFunction;
    easeInOutQuad: IUtilAminEaseFunction;
    easeInOutQuart: IUtilAminEaseFunction;
    easeInOutQuint: IUtilAminEaseFunction;
    easeInOutSine: IUtilAminEaseFunction;
    easeInQuad: IUtilAminEaseFunction;
    easeInQuart: IUtilAminEaseFunction;
    easeInQuint: IUtilAminEaseFunction;
    easeInSine: IUtilAminEaseFunction;
    easeOutBack: IUtilAminEaseFunction;
    easeOutBounce: IUtilAminEaseFunction;
    easeOutCirc: IUtilAminEaseFunction;
    easeOutCubic: IUtilAminEaseFunction;
    easeOutElastic: IUtilAminEaseFunction;
    easeOutExpo: IUtilAminEaseFunction;
    easeOutQuad: IUtilAminEaseFunction;
    easeOutQuart: IUtilAminEaseFunction;
    easeOutQuint: IUtilAminEaseFunction;
    easeOutSine: IUtilAminEaseFunction;
  }

  interface IUtilArc {
    /**
     * Draws arc
     * @param {CanvasRenderingContext2D} ctx
     * @param {Number} fx
     * @param {Number} fy
     * @param {Array} coords
     */
    drawArc(ctx: CanvasRenderingContext2D, fx: number, fy: number, coords: number[]): void;
    /**
     * Calculate bounding box of a elliptic-arc
     * @param {Number} fx start point of arc
     * @param {Number} fy
     * @param {Number} rx horizontal radius
     * @param {Number} ry vertical radius
     * @param {Number} rot angle of horizontal axe
     * @param {Number} large 1 or 0, whatever the arc is the big or the small on the 2 points
     * @param {Number} sweep 1 or 0, 1 clockwise or counterclockwise direction
     * @param {Number} tx end point of arc
     * @param {Number} ty
     */
    getBoundsOfArc(fx: number, fy: number, rx: number, ry: number, rot: number, large: number, sweep: number, tx: number, ty: number): IPoint[];
    /**
     * Calculate bounding box of a beziercurve
     * @param {Number} x0 starting point
     * @param {Number} y0
     * @param {Number} x1 first control point
     * @param {Number} y1
     * @param {Number} x2 secondo control point
     * @param {Number} y2
     * @param {Number} x3 end of beizer
     * @param {Number} y3
     */
    getBoundsOfCurve(x0: number, y0: number, x1: number, y1: number, x2: number, y2: number, x3: number, y3: number): IPoint[];

  }

  interface IUtilDomEvent {
    /**
     * Cross-browser wrapper for getting event's coordinates
     * @param {Event} event Event object
     * @param {HTMLCanvasElement} upperCanvasEl &lt;canvas> element on which object selection is drawn
     */
    getPointer(event: Event, upperCanvasEl: HTMLCanvasElement): IPoint;

    /**
     * Adds an event listener to an element
     * @param {HTMLElement} element
     * @param {String} eventName
     * @param {Function} handler
     */
    addListener(element: HTMLElement, eventName: string, handler: Function): void;

    /**
     * Removes an event listener from an element
     * @param {HTMLElement} element
     * @param {String} eventName
     * @param {Function} handler
     */
    removeListener(element: HTMLElement, eventName: string, handler: Function): void;
  }

  interface IUtilDomMisc {
    /**
     * Takes id and returns an element with that id (if one exists in a document)
     * @param {String|HTMLElement} id
     */
    getById(id: string|HTMLElement): HTMLElement;
    /**
     * Converts an array-like object (e.g. arguments or NodeList) to an array
     * @param {Object} arrayLike
     */
    toArray(arrayLike: any): any[];
    /**
     * Creates specified element with specified attributes
     * @memberOf fabric.util
     * @param {String} tagName Type of an element to create
     * @param {Object} [attributes] Attributes to set on an element
     * @return {HTMLElement} Newly created element
     */
    makeElement(tagName: string, attributes?: any): HTMLElement;
    /**
     * Adds class to an element
     * @param {HTMLElement} element Element to add class to
     * @param {String} className Class to add to an element
     */
    addClass(element: HTMLElement, classname: string): void;
    /**
     * Wraps element with another element
     * @param {HTMLElement} element Element to wrap
     * @param {HTMLElement|String} wrapper Element to wrap with
     * @param {Object} [attributes] Attributes to set on a wrapper
     */
    wrapElement(element: HTMLElement, wrapper: HTMLElement|string, attributes?: any): HTMLElement;
    /**
     * Returns element scroll offsets
     * @param {HTMLElement} element Element to operate on
     * @param {HTMLElement} upperCanvasEl Upper canvas element
     */
    getScrollLeftTop(element: HTMLElement, upperCanvasEl: HTMLElement): { left: number; right: number; };
    /**
     * Returns offset for a given element
     * @param {HTMLElement} element Element to get offset for
     */
    getElementOffset(element: HTMLElement): { left: number; right: number; };
    /**
     * Returns style attribute value of a given element
     * @param {HTMLElement} element Element to get style attribute for
     * @param {String} attr Style attribute to get for element
     */
    getElementStyle(elment: HTMLElement, attr: string): string;
    /**
     * Inserts a script element with a given url into a document; invokes callback, when that script is finished loading
     * @memberOf fabric.util
     * @param {String} url URL of a script to load
     * @param {Function} callback Callback to execute when script is finished loading
     */
    getScript(url: string, callback: Function): void;
    /**
     * Makes element unselectable
     * @param {HTMLElement} element Element to make unselectable
     */
    makeElementUnselectable(element: HTMLElement): HTMLElement;
    /**
     * Makes element selectable
     * @param {HTMLElement} element Element to make selectable
     */
    makeElementSelectable(element: HTMLElement): HTMLElement;
  }

  interface IUtilDomRequest {
    /**
     * Cross-browser abstraction for sending XMLHttpRequest
     * @param {String} url URL to send XMLHttpRequest to
     * @param {Object} [options] Options object
     * @param {String} [options.method="GET"]
     * @param {Function} options.onComplete Callback to invoke when request is completed
     */
    request(url: string, options?: { method?: string; onComplete: Function }): XMLHttpRequest;
  }

  interface IUtilDomStyle {
    /**
     * Cross-browser wrapper for setting element's style
     * @param {HTMLElement} element
     * @param {Object} styles
     */
    setStyle(element: HTMLElement, styles: any): HTMLElement;
  }

  interface IUtilArray {
    /**
     * Invokes method on all items in a given array
     * @param {Array} array Array to iterate over
     * @param {String} method Name of a method to invoke
     */
    invoke(array: any[], method: string): any[];
    /**
     * Finds minimum value in array (not necessarily "first" one)
     * @param {Array} array Array to iterate over
     * @param {String} byProperty
     */
    min(array: any[], byProperty: string): any;
    /**
     * Finds maximum value in array (not necessarily "first" one)
     * @param {Array} array Array to iterate over
     * @param {String} byProperty
     */
    max(array: any[], byProperty: string): any;
  }

  interface IUtilClass {
    /**
     * Helper for creation of "classes".
     * @param {Function} [parent] optional "Class" to inherit from
     * @param {Object} [properties] Properties shared by all instances of this class
     *                  (be careful modifying objects defined here as this would affect all instances)
     */
    createClass(parent: Function, properties?: any): void;
    /**
     * Helper for creation of "classes".
     * @param {Object} [properties] Properties shared by all instances of this class
     *                  (be careful modifying objects defined here as this would affect all instances)
     */
    createClass(properties?: any): void;

  }

  interface IUtilObject {
    /**
     * Copies all enumerable properties of one object to another
     * @param {Object} destination Where to copy to
     * @param {Object} source Where to copy from
     */
    extend(destination: any, source: any): any;

    /**
     * Creates an empty object and copies all enumerable properties of another object to it
     * @memberOf fabric.util.object
     * @param {Object} object Object to clone
     * @return {Object}
     */
    clone(object: any): any
  }

  interface IUtilString {
    /**
     * Camelizes a string
     * @param {String} string String to camelize
     */
    camelize(string: string): string;

    /**
     * Capitalizes a string
     * @param {String} string String to capitalize
     * @param {Boolean} [firstLetterOnly] If true only first letter is capitalized
     * and other letters stay untouched, if false first letter is capitalized
     * and other letters are converted to lowercase.
     */
    capitalize(string: string, firstLetterOnly: boolean): string;

    /**
     * Escapes XML in a string
     * @param {String} string String to escape
     */
    escapeXml(string: string): string;
  }

  interface IUtilMisc {
    /**
     * Removes value from an array.
     * Presence of value (and its position in an array) is determined via `Array.prototype.indexOf`
     * @param {Array} array
     * @param {Any} value
     */
    removeFromArray(array: any[], value: any): any[];

    /**
     * Returns random number between 2 specified ones.
     * @param {Number} min lower limit
     * @param {Number} max upper limit
     */
    getRandomInt(min: number, max: number): number;

    /**
     * Transforms degrees to radians.
     * @param {Number} degrees value in degrees
     */
    degreesToRadians(degrees: number): number;

    /**
     * Transforms radians to degrees.
     * @memberOf fabric.util
     * @param {Number} radians value in radians
     */
    radiansToDegrees(radians: number): number;

    /**
     * Rotates `point` around `origin` with `radians`
     * @param {fabric.Point} point The point to rotate
     * @param {fabric.Point} origin The origin of the rotation
     * @param {Number} radians The radians of the angle for the rotation
     */
    rotatePoint(point: IPoint, origin: IPoint, radians: number): IPoint;

    /**
     * Apply transform t to point p
     * @param  {fabric.Point} p The point to transform
     * @param  {Array} t The transform
     * @param  {Boolean} [ignoreOffset] Indicates that the offset should not be applied
     */
    transformPoint(p: IPoint, t: any[], ignoreOffset?: boolean): IPoint;

    /**
     * Invert transformation t
     * @param {Array} t The transform
     */
    invertTransform(t: any[]): any[];

    /**
     * A wrapper around Number#toFixed, which contrary to native method returns number, not string.
     * @param {Number|String} number number to operate on
     * @param {Number} fractionDigits number of fraction digits to "leave"
     */
    toFixed(number: number, fractionDigits: number): number;

    /**
     * Converts from attribute value to pixel value if applicable.
     * Returns converted pixels or original value not converted.
     * @param {Number|String} value number to operate on
     */
    parseUnit(value: number|string, fontSize?: number): number|string;

    /**
     * Function which always returns `false`.
     */
    falseFunction(): boolean;

    /**
     * Returns klass "Class" object of given namespace
     * @param {String} type Type of object (eg. 'circle')
     * @param {String} namespace Namespace to get klass "Class" object from
     */
    getKlass(type: string, namespace: string): any;

    /**
     * Returns object of given namespace
     * @param {String} namespace Namespace string e.g. 'fabric.Image.filter' or 'fabric'
     */
    resolveNamespace(namespace: string): any;

    /**
     * Loads image element from given url and passes it to a callback
     * @param {String} url URL representing an image
     * @param {Function} callback Callback; invoked with loaded image
     * @param {Any} [context] Context to invoke callback in
     * @param {Object} [crossOrigin] crossOrigin value to set image element to
     */
    loadImage(url: string, callback: (image: HTMLImageElement) => {}, context?: any, crossOrigin?: boolean): void;

    /**
     * Creates corresponding fabric instances from their object representations
     * @param {Array} objects Objects to enliven
     * @param {Function} callback Callback to invoke when all objects are created
     * @param {String} namespace Namespace to get klass "Class" object from
     * @param {Function} reviver Method for further parsing of object elements, called after each fabric object created.
     */
    enlivenObjects(objects: any[], callback: Function, namespace: string, reviver?: Function): void;

    /**
     * Groups SVG elements (usually those retrieved from SVG document)
     * @param {Array} elements SVG elements to group
     * @param {Object} [options] Options object
     */
    groupSVGElements(elements: any[], options?: any, path?: any): IPathGroup;

    /**
     * Populates an object with properties of another object
     * @param {Object} source Source object
     * @param {Object} destination Destination object
     * @param {Array} properties Propertie names to include
     */
    populateWithProperties(source: any, destination: any, properties: any): void;

    /**
     * Draws a dashed line between two points
     * This method is used to draw dashed line around selection area.
     * @param {CanvasRenderingContext2D} ctx context
     * @param {Number} x  start x coordinate
     * @param {Number} y start y coordinate
     * @param {Number} x2 end x coordinate
     * @param {Number} y2 end y coordinate
     * @param {Array} da dash array pattern
     */
    drawDashedLine(ctx: CanvasRenderingContext2D, x: number, y: number, x2: number, y2: number, da: any[]): void;

    /**
     * Creates canvas element and initializes it via excanvas if necessary
     * @param {CanvasElement} [canvasEl] optional canvas element to initialize;
     * when not given, element is created implicitly
     */
    createCanvasElement(canvasEl?: HTMLCanvasElement): HTMLCanvasElement;

    /**
     * Creates image element (works on client and node)
     */
    createImage(): HTMLImageElement;

    /**
     * Creates accessors (getXXX, setXXX) for a "class", based on "stateProperties" array
     * @param {Object} klass "Class" to create accessors for
     */
    createAccessors(klass: any): any;

    /**
     * @param {fabric.Object} receiver Object implementing `clipTo` method
     * @param {CanvasRenderingContext2D} ctx Context to clip
     */
    clipContext(receiver: IObject, ctx: CanvasRenderingContext2D): void;

    /**
     * Multiply matrix A by matrix B to nest transformations
     * @param  {Array} a First transformMatrix
     * @param  {Array} b Second transformMatrix
     */
    multiplyTransformMatrices(a: any[], b: any[]): any[];

    /**
     * Returns string representation of function body
     * @param {Function} fn Function to get body of
     */
    getFunctionBody(fn: Function): string;

    /**
     * Returns true if context has transparent pixel
     * at specified location (taking tolerance into account)
     * @param {CanvasRenderingContext2D} ctx context
     * @param {Number} x x coordinate
     * @param {Number} y y coordinate
     * @param {Number} tolerance Tolerance
     */
    isTransparent(ctx: CanvasRenderingContext2D, x: number, y: number, tolerance: number): boolean;
  }

  interface IUtil extends IUtilAnimation, IUtilArc, IObservable<IUtil>, IUtilDomEvent, IUtilDomMisc,
    IUtilDomRequest, IUtilDomStyle, IUtilClass, IUtilMisc {
    ease: IUtilAnimEase;
    array: IUtilArray;
    object: IUtilObject;
    string: IUtilString;
  }
}