## API Report File for "@uifabric/utilities"

> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).

```ts

import { IProcessedStyleSet } from '@uifabric/merge-styles';
import { IStyleFunction } from '@uifabric/merge-styles';
import { IStyleFunctionOrObject } from '@uifabric/merge-styles';
import { IStyleSet } from '@uifabric/merge-styles';
import { Omit } from '@uifabric/merge-styles';
import * as React from 'react';

// @public
export function addDirectionalKeyCode(which: number): void;

// @public
export function addElementAtIndex<T>(array: T[], index: number, itemToAdd: T): T[];

// @public
export const allowOverscrollOnElement: (element: HTMLElement | null, events: EventGroup) => void;

// @public
export const allowScrollOnElement: (element: HTMLElement | null, events: EventGroup) => void;

// @public
export const anchorProperties: Record<string, number>;

// @public
export function appendFunction(parent: any, ...functions: any[]): () => void;

// @public
export function arraysEqual<T>(array1: T[], array2: T[]): boolean;

// @public
export function asAsync<TProps>(options: IAsAsyncOptions<TProps>): React.ForwardRefExoticComponent<React.PropsWithoutRef<TProps & {
    asyncPlaceholder?: "symbol" | "object" | "text" | "table" | "ruby" | "small" | "input" | "progress" | "select" | "a" | "abbr" | "address" | "area" | "article" | "aside" | "audio" | "b" | "base" | "bdi" | "bdo" | "blockquote" | "body" | "br" | "button" | "canvas" | "caption" | "cite" | "code" | "col" | "colgroup" | "data" | "datalist" | "dd" | "del" | "details" | "dfn" | "dialog" | "div" | "dl" | "dt" | "em" | "embed" | "fieldset" | "figcaption" | "figure" | "footer" | "form" | "h1" | "h2" | "h3" | "h4" | "h5" | "h6" | "head" | "header" | "hgroup" | "hr" | "html" | "i" | "iframe" | "img" | "ins" | "kbd" | "label" | "legend" | "li" | "link" | "main" | "map" | "mark" | "menu" | "meta" | "meter" | "nav" | "noscript" | "ol" | "optgroup" | "option" | "output" | "p" | "param" | "picture" | "pre" | "q" | "rp" | "rt" | "s" | "samp" | "script" | "section" | "source" | "span" | "strong" | "style" | "sub" | "summary" | "sup" | "tbody" | "td" | "template" | "textarea" | "tfoot" | "th" | "thead" | "time" | "title" | "tr" | "track" | "u" | "ul" | "var" | "video" | "wbr" | "big" | React.ComponentClass<any, any> | React.FunctionComponent<any> | "keygen" | "menuitem" | "noindex" | "webview" | "svg" | "animate" | "animateMotion" | "animateTransform" | "circle" | "clipPath" | "defs" | "desc" | "ellipse" | "feBlend" | "feColorMatrix" | "feComponentTransfer" | "feComposite" | "feConvolveMatrix" | "feDiffuseLighting" | "feDisplacementMap" | "feDistantLight" | "feDropShadow" | "feFlood" | "feFuncA" | "feFuncB" | "feFuncG" | "feFuncR" | "feGaussianBlur" | "feImage" | "feMerge" | "feMergeNode" | "feMorphology" | "feOffset" | "fePointLight" | "feSpecularLighting" | "feSpotLight" | "feTile" | "feTurbulence" | "filter" | "foreignObject" | "g" | "image" | "line" | "linearGradient" | "marker" | "mask" | "metadata" | "mpath" | "path" | "pattern" | "polygon" | "polyline" | "radialGradient" | "rect" | "stop" | "switch" | "textPath" | "tspan" | "use" | "view" | undefined;
}> & React.RefAttributes<React.ElementType<TProps>>>;

// @public
export function assertNever(x: never): never;

// @public
export function assign(target: any, ...args: any[]): any;

// @public
export class Async {
    constructor(parent?: object, onError?: (e: any) => void);
    // (undocumented)
    cancelAnimationFrame(id: number, targetElement?: Element | null): void;
    clearImmediate(id: number, targetElement?: Element | null): void;
    clearInterval(id: number): void;
    clearTimeout(id: number): void;
    debounce<T extends Function>(func: T, wait?: number, options?: {
        leading?: boolean;
        maxWait?: number;
        trailing?: boolean;
    }): ICancelable<T> & (() => void);
    dispose(): void;
    // (undocumented)
    protected _logError(e: any): void;
    // (undocumented)
    requestAnimationFrame(callback: () => void, targetElement?: Element | null): number;
    setImmediate(callback: () => void, targetElement?: Element | null): number;
    setInterval(callback: () => void, duration: number): number;
    setTimeout(callback: () => void, duration: number): number;
    throttle<T extends Function>(func: T, wait?: number, options?: {
        leading?: boolean;
        trailing?: boolean;
    }): T | (() => void);
    }

// @public
export const audioProperties: Record<string, number>;

// @public
export class AutoScroll {
    constructor(element: HTMLElement);
    // (undocumented)
    dispose(): void;
    }

// @public @deprecated
export class BaseComponent<TProps extends IBaseProps = {}, TState = {}> extends React.Component<TProps, TState> {
    constructor(props: TProps, context?: any);
    protected readonly _async: Async;
    readonly className: string;
    componentDidMount(): void;
    componentDidUpdate(prevProps: TProps, prevState: TState): void;
    componentWillUnmount(): void;
    protected readonly _disposables: IDisposable[];
    protected readonly _events: EventGroup;
    // @deprecated (undocumented)
    static onError: (errorMessage?: string, ex?: any) => void;
    // @deprecated
    protected _resolveRef(refName: string): (ref: React.ReactNode) => React.ReactNode;
    protected _skipComponentRefResolution: boolean;
    protected _updateComponentRef(currentProps: IBaseProps, newProps?: IBaseProps): void;
    protected _warnConditionallyRequiredProps(requiredProps: string[], conditionalPropName: string, condition: boolean): void;
    protected _warnDeprecations(deprecationMap: ISettingsMap<TProps>): void;
    protected _warnMutuallyExclusive(mutuallyExclusiveMap: ISettingsMap<TProps>): void;
}

// @public
export const baseElementEvents: Record<string, number>;

// @public
export const baseElementProperties: Record<string, number>;

// @public
export const buttonProperties: Record<string, number>;

// @public
export function calculatePrecision(value: number | string): number;

// @public
export function classNamesFunction<TStyleProps extends {}, TStyleSet extends IStyleSet<TStyleSet>>(options?: IClassNamesFunctionOptions): (getStyles: IStyleFunctionOrObject<TStyleProps, TStyleSet> | undefined, styleProps?: TStyleProps) => IProcessedStyleSet<TStyleSet>;

// @public (undocumented)
export const colGroupProperties: Record<string, number>;

// @public (undocumented)
export const colProperties: Record<string, number>;

// @public
export function composeComponentAs<TProps>(outer: IComponentAs<TProps>, inner: IComponentAs<TProps>): IComponentAs<TProps>;

// @public
export function composeRenderFunction<TProps>(outer: IRenderFunction<TProps>, inner: IRenderFunction<TProps>): IRenderFunction<TProps>;

// @public
export function createArray<T>(size: number, getItem: (index: number) => T): T[];

// @public
export function createMemoizer<F extends (input: any) => any>(getValue: F): F;

// Warning: (ae-incompatible-release-tags) The symbol "css" is marked as @public, but its signature references "ICssInput" which is marked as @internal
//
// @public
export function css(...args: ICssInput[]): string;

// @public (undocumented)
export function customizable(scope: string, fields: string[], concatStyles?: boolean): <P>(ComposedComponent: React.ComponentType<P>) => any;

// @public (undocumented)
export class Customizations {
    static applyBatchedUpdates(code: () => void, suppressUpdate?: boolean): void;
    static applyScopedSettings(scopeName: string, settings: ISettings): void;
    static applySettings(settings: ISettings): void;
    // (undocumented)
    static getSettings(properties: string[], scopeName?: string, localSettings?: ICustomizations): any;
    // (undocumented)
    static observe(onChange: () => void): void;
    // (undocumented)
    static reset(): void;
    // (undocumented)
    static unobserve(onChange: () => void): void;
}

// @public
export class Customizer extends React.Component<ICustomizerProps> {
    // (undocumented)
    componentDidMount(): void;
    // (undocumented)
    componentWillUnmount(): void;
    // (undocumented)
    render(): React.ReactElement<{}>;
}

// @public (undocumented)
export const CustomizerContext: React.Context<ICustomizerContext>;

// @public
export const DATA_IS_SCROLLABLE_ATTRIBUTE = "data-is-scrollable";

// @public (undocumented)
export const DATA_PORTAL_ATTRIBUTE = "data-portal-element";

// Warning: (ae-incompatible-release-tags) The symbol "DelayedRender" is marked as @public, but its signature references "IDelayedRenderState" which is marked as @internal
//
// @public
export class DelayedRender extends React.Component<IDelayedRenderProps, IDelayedRenderState> {
    constructor(props: IDelayedRenderProps);
    // (undocumented)
    componentDidMount(): void;
    // (undocumented)
    componentWillUnmount(): void;
    // (undocumented)
    static defaultProps: {
        delay: number;
    };
    // (undocumented)
    render(): React.ReactElement<{}> | null;
    }

// @public
export function disableBodyScroll(): void;

// @public
export const divProperties: Record<string, number>;

// @public
export function doesElementContainFocus(element: HTMLElement): boolean;

// @public
export function elementContains(parent: HTMLElement | null, child: HTMLElement | null, allowVirtualParents?: boolean): boolean;

// @public
export function elementContainsAttribute(element: HTMLElement, attribute: string): string | null;

// @public
export function enableBodyScroll(): void;

// @public
export class EventGroup {
    constructor(parent: any);
    declare(event: string | string[]): void;
    // (undocumented)
    dispose(): void;
    static isDeclared(target: any, eventName: string): boolean;
    // (undocumented)
    static isObserved(target: any, eventName: string): boolean;
    // (undocumented)
    off(target?: any, eventName?: string, callback?: (args?: any) => void, options?: boolean | AddEventListenerOptions): void;
    on(target: any, eventName: string, callback: (args?: any) => void, options?: boolean | AddEventListenerOptions): void;
    onAll(target: any, events: {
        [key: string]: (args?: any) => void;
    }, useCapture?: boolean): void;
    static raise(target: any, eventName: string, eventArgs?: any, bubbleEvent?: boolean): boolean | undefined;
    raise(eventName: string, eventArgs?: any, bubbleEvent?: boolean): boolean | undefined;
    // (undocumented)
    static stopPropagation(event: any): void;
    }

// @public
export function extendComponent<T extends React.Component>(parent: T, methods: {
    [key in keyof T]?: T[key];
}): void;

// @public
export class FabricPerformance {
    static measure(name: string, func: () => void): void;
    // (undocumented)
    static reset(): void;
    // (undocumented)
    static setPeriodicReset(): void;
    // Warning: (ae-incompatible-release-tags) The symbol "summary" is marked as @public, but its signature references "IPerfSummary" which is marked as @internal
    //
    // (undocumented)
    static summary: IPerfSummary;
    }

// @public
export function filteredAssign(isAllowed: (propName: string) => boolean, target: any, ...args: any[]): any;

// @public
export function find<T>(array: T[], cb: (item: T, index: number) => boolean): T | undefined;

// @public
export function findElementRecursive(element: HTMLElement | null, matchFunction: (element: HTMLElement) => boolean): HTMLElement | null;

// @public
export function findIndex<T>(array: T[], cb: (item: T, index: number) => boolean, fromIndex?: number): number;

// @public
export function findScrollableParent(startingElement: HTMLElement | null): HTMLElement | Window | undefined | null;

// @public
export function fitContentToBounds(options: IFitContentToBoundsOptions): ISize;

// @public
export type FitMode = 'contain' | 'cover';

// @public
export function flatten<T>(array: (T | T[])[]): T[];

// @public
export function focusAsync(element: HTMLElement | {
    focus: () => void;
} | undefined | null): void;

// @public
export function focusFirstChild(rootElement: HTMLElement): boolean;

// @public
export const FocusRects: React.FunctionComponent<{
    rootRef?: React.RefObject<HTMLElement>;
}>;

// @public
export function format(s: string, ...values: any[]): string;

// @public
export const formProperties: Record<string, number>;

// @public
export function getChildren(parent: HTMLElement, allowVirtualChildren?: boolean): HTMLElement[];

// @public
export function getDistanceBetweenPoints(point1: Point, point2: Point): number;

// @public
export function getDocument(rootElement?: HTMLElement | null): Document | undefined;

// @public
export function getElementIndexPath(fromElement: HTMLElement, toElement: HTMLElement): number[];

// @public
export function getFirstFocusable(rootElement: HTMLElement, currentElement: HTMLElement, includeElementsInFocusZones?: boolean): HTMLElement | null;

// @public
export function getFirstTabbable(rootElement: HTMLElement, currentElement: HTMLElement, includeElementsInFocusZones?: boolean, checkNode?: boolean): HTMLElement | null;

// @public
export function getFocusableByIndexPath(parent: HTMLElement, path: number[]): HTMLElement | undefined;

// @public
export function getId(prefix?: string): string;

// @public
export function getInitials(displayName: string | undefined | null, isRtl: boolean, allowPhoneInitials?: boolean): string;

// @public
export function getLanguage(): string | null;

// @public
export function getLastFocusable(rootElement: HTMLElement, currentElement: HTMLElement, includeElementsInFocusZones?: boolean): HTMLElement | null;

// @public
export function getLastTabbable(rootElement: HTMLElement, currentElement: HTMLElement, includeElementsInFocusZones?: boolean, checkNode?: boolean): HTMLElement | null;

// @public
export function getNativeElementProps<TAttributes extends React.HTMLAttributes<any>>(tagName: string, props: {}, excludedPropNames?: string[]): TAttributes;

// @public
export function getNativeProps<T extends Record<string, any>>(props: Record<string, any>, allowedPropNames: string[] | Record<string, number>, excludedPropNames?: string[]): T;

// @public
export function getNextElement(rootElement: HTMLElement, currentElement: HTMLElement | null, checkNode?: boolean, suppressParentTraversal?: boolean, suppressChildTraversal?: boolean, includeElementsInFocusZones?: boolean, allowFocusRoot?: boolean, tabbable?: boolean): HTMLElement | null;

// @public
export function getParent(child: HTMLElement, allowVirtualParents?: boolean): HTMLElement | null;

// @public
export function getPreviousElement(rootElement: HTMLElement, currentElement: HTMLElement | null, checkNode?: boolean, suppressParentTraversal?: boolean, traverseChildren?: boolean, includeElementsInFocusZones?: boolean, allowFocusRoot?: boolean, tabbable?: boolean): HTMLElement | null;

// @public
export function getPropsWithDefaults<TProps extends {}>(defaultProps: Partial<TProps>, propsWithoutDefaults: TProps): TProps;

// @public
export function getRect(element: HTMLElement | Window | null): IRectangle | undefined;

// @public
export function getResourceUrl(url: string): string;

// @public
export function getRTL(theme?: {
    rtl?: boolean;
}): boolean;

// @public
export function getRTLSafeKeyCode(key: number, theme?: {
    rtl?: boolean;
}): number;

// @public
export function getScrollbarWidth(): number;

// @public
export function getVirtualParent(child: HTMLElement): HTMLElement | undefined;

// @public
export function getWindow(rootElement?: Element | null): Window | undefined;

// @public
export class GlobalSettings {
    // (undocumented)
    static addChangeListener(cb: IChangeEventCallback): void;
    // (undocumented)
    static getValue<T>(key: string, defaultValue?: T | (() => T)): T;
    // (undocumented)
    static removeChangeListener(cb: IChangeEventCallback): void;
    // (undocumented)
    static setValue<T>(key: string, value: T): T;
}

// @public
export function hasHorizontalOverflow(element: HTMLElement): boolean;

// @public
export function hasOverflow(element: HTMLElement): boolean;

// @public
export function hasVerticalOverflow(element: HTMLElement): boolean;

// @public
export function hoistMethods(destination: any, source: any, exclusions?: string[]): string[];

// @public
export function hoistStatics<TSource extends Object, TDest>(source: TSource, dest: TDest): TDest;

// @public
export const htmlElementProperties: Record<string, number>;

// @public (undocumented)
export interface IAsAsyncOptions<TProps> {
    load: () => Promise<React.ElementType<TProps>>;
    onError?: (error: Error) => void;
    onLoad?: () => void;
}

// @public
export interface IBaseProps<T = any> {
    // (undocumented)
    componentRef?: IRefObject<T>;
}

// @public (undocumented)
export type ICancelable<T> = {
    flush: () => T;
    cancel: () => void;
    pending: () => boolean;
};

// @public
export interface IChangeDescription {
    // (undocumented)
    key: string;
    // (undocumented)
    oldValue: any;
    // (undocumented)
    value: any;
}

// @public
export interface IChangeEventCallback {
    // (undocumented)
    (changeDescription?: IChangeDescription): void;
    // (undocumented)
    __id__?: string;
}

// @public @deprecated (undocumented)
export type IClassNames<T> = {
    [key in keyof T]: string;
};

// @public (undocumented)
export interface IClassNamesFunctionOptions {
    cacheSize?: number;
    disableCaching?: boolean;
    useStaticStyles?: boolean;
}

// @public
export type IComponentAs<T> = React.ComponentType<IComponentAsProps<T>>;

// @public
export type IComponentAsProps<T> = T & {
    defaultRender?: React.ComponentType<T>;
};

// Warning: (ae-internal-missing-underscore) The name "ICssInput" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal
export type ICssInput = string | ISerializableObject | IDictionary | null | undefined | boolean;

// @public (undocumented)
export interface ICustomizableProps {
    fields?: string[];
    scope: string;
}

// @public (undocumented)
export interface ICustomizations {
    // (undocumented)
    inCustomizerContext?: boolean;
    // (undocumented)
    scopedSettings: {
        [key: string]: ISettings;
    };
    // (undocumented)
    settings: ISettings;
}

// @public (undocumented)
export interface ICustomizerContext {
    // (undocumented)
    customizations: ICustomizations;
}

// @public (undocumented)
export type ICustomizerProps = IBaseProps & Partial<{
    settings: ISettings | ISettingsFunction;
    scopedSettings: ISettings | ISettingsFunction;
}> & {
    contextTransform?: (context: Readonly<ICustomizerContext>) => ICustomizerContext;
};

// Warning: (ae-internal-missing-underscore) The name "IDeclaredEventsByName" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal (undocumented)
export interface IDeclaredEventsByName {
    // (undocumented)
    [eventName: string]: boolean;
}

// @public
export interface IDelayedRenderProps extends React.Props<{}> {
    delay?: number;
}

// Warning: (ae-internal-missing-underscore) The name "IDelayedRenderState" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal
export interface IDelayedRenderState {
    isRendered: boolean;
}

// Warning: (ae-internal-missing-underscore) The name "IDictionary" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal
export interface IDictionary {
    // (undocumented)
    [className: string]: boolean;
}

// @public
export interface IDisposable {
    // (undocumented)
    dispose: () => void;
}

// Warning: (ae-internal-missing-underscore) The name "IEventRecord" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal (undocumented)
export interface IEventRecord {
    // (undocumented)
    callback: (args?: any) => void;
    // (undocumented)
    elementCallback?: (...args: any[]) => void;
    // (undocumented)
    eventName: string;
    // (undocumented)
    objectCallback?: (args?: any) => void;
    // (undocumented)
    options?: boolean | AddEventListenerOptions;
    // (undocumented)
    parent: any;
    // (undocumented)
    target: any;
}

// Warning: (ae-internal-missing-underscore) The name "IEventRecordList" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal (undocumented)
export interface IEventRecordList {
    // (undocumented)
    [id: string]: IEventRecord[] | number;
    // (undocumented)
    count: number;
}

// Warning: (ae-internal-missing-underscore) The name "IEventRecordsByName" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal (undocumented)
export interface IEventRecordsByName {
    // (undocumented)
    [eventName: string]: IEventRecordList;
}

// @public
export interface IFitContentToBoundsOptions {
    boundsSize: ISize;
    contentSize: ISize;
    maxScale?: number;
    mode: FitMode;
}

// @public
export const iframeProperties: Record<string, number>;

// @public @deprecated (undocumented)
export const imageProperties: Record<string, number>;

// @public
export const imgProperties: Record<string, number>;

// @public
export function initializeComponentRef<TProps extends IBaseProps, TState>(obj: React.Component<TProps, TState>): void;

// @public @deprecated
export function initializeFocusRects(window?: Window): void;

// @public
export const inputProperties: Record<string, number>;

// @public (undocumented)
export interface IObjectWithKey {
    // (undocumented)
    key?: string | number;
}

// Warning: (ae-internal-missing-underscore) The name "IPerfData" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal
export interface IPerfData {
    // (undocumented)
    duration: number;
    // (undocumented)
    timeStamp: number;
}

// Warning: (ae-internal-missing-underscore) The name "IPerfMeasurement" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal
export interface IPerfMeasurement {
    // (undocumented)
    all: IPerfData[];
    // (undocumented)
    count: number;
    // (undocumented)
    totalDuration: number;
}

// Warning: (ae-internal-missing-underscore) The name "IPerfSummary" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal
export interface IPerfSummary {
    // (undocumented)
    [key: string]: IPerfMeasurement;
}

// @public @deprecated
export interface IPoint extends Point {
}

// @public (undocumented)
export interface IPropsWithStyles<TStyleProps, TStyleSet extends IStyleSet<TStyleSet>> {
    // (undocumented)
    styles?: IStyleFunctionOrObject<TStyleProps, TStyleSet>;
}

// @public
export interface IRectangle {
    // (undocumented)
    bottom?: number;
    // (undocumented)
    height: number;
    // (undocumented)
    left: number;
    // (undocumented)
    right?: number;
    // (undocumented)
    top: number;
    // (undocumented)
    width: number;
}

// @public (undocumented)
export type IRefObject<T> = React.RefObject<T> | RefObject<T> | ((ref: T | null) => void);

// @public
export interface IRenderComponent<TProps> {
    children: (props: TProps) => JSX.Element;
}

// @public
export interface IRenderFunction<P> {
    // (undocumented)
    (props?: P, defaultRender?: (props?: P) => JSX.Element | null): JSX.Element | null;
}

// @public
export function isControlled<P>(props: P, valueProp: keyof P): boolean;

// @public
export function isDirectionalKeyCode(which: number): boolean;

// @public (undocumented)
export interface ISelection<TItem = IObjectWithKey> {
    // (undocumented)
    canSelectItem: (item: TItem, index?: number) => boolean;
    // (undocumented)
    count: number;
    // (undocumented)
    getItems(): TItem[];
    // (undocumented)
    getSelectedCount(): number;
    // (undocumented)
    getSelectedIndices(): number[];
    // (undocumented)
    getSelection(): TItem[];
    // (undocumented)
    isAllSelected(): boolean;
    // (undocumented)
    isIndexSelected(index: number): boolean;
    // (undocumented)
    isKeySelected(key: string): boolean;
    // (undocumented)
    isModal?(): boolean;
    // (undocumented)
    isRangeSelected(fromIndex: number, count: number): boolean;
    // (undocumented)
    mode: SelectionMode;
    // (undocumented)
    selectToIndex(index: number, clearSelection?: boolean): void;
    // (undocumented)
    selectToKey(key: string, clearSelection?: boolean): void;
    // (undocumented)
    setAllSelected(isAllSelected: boolean): void;
    // (undocumented)
    setChangeEvents(isEnabled: boolean, suppressChange?: boolean): void;
    // (undocumented)
    setIndexSelected(index: number, isSelected: boolean, shouldAnchor: boolean): void;
    // (undocumented)
    setItems(items: TItem[], shouldClear: boolean): void;
    // (undocumented)
    setKeySelected(key: string, isSelected: boolean, shouldAnchor: boolean): void;
    // (undocumented)
    setModal?(isModal: boolean): void;
    // (undocumented)
    toggleAllSelected(): void;
    // (undocumented)
    toggleIndexSelected(index: number): void;
    // (undocumented)
    toggleKeySelected(key: string): void;
    // (undocumented)
    toggleRangeSelected(fromIndex: number, count: number): void;
}

// @public (undocumented)
export interface ISelectionOptions<TItem = IObjectWithKey> {
    // (undocumented)
    canSelectItem?: (item: TItem, index?: number) => boolean;
    getKey?: (item: TItem, index?: number) => string | number;
    // (undocumented)
    items?: TItem[];
    // (undocumented)
    onSelectionChanged?: () => void;
    // (undocumented)
    selectionMode?: SelectionMode;
}

// @public
export type ISelectionOptionsWithRequiredGetKey<TItem> = ISelectionOptions<TItem> & Required<Pick<ISelectionOptions<TItem>, 'getKey'>>;

// @public
export function isElementFocusSubZone(element?: HTMLElement): boolean;

// @public
export function isElementFocusZone(element?: HTMLElement): boolean;

// @public
export function isElementTabbable(element: HTMLElement, checkTabIndex?: boolean): boolean;

// @public
export function isElementVisible(element: HTMLElement | undefined | null): boolean;

// Warning: (ae-internal-missing-underscore) The name "ISerializableObject" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal
export interface ISerializableObject {
    // (undocumented)
    toString?: () => string;
}

// @public (undocumented)
export type ISettings = {
    [key: string]: any;
};

// @public (undocumented)
export type ISettingsFunction = (settings: ISettings) => ISettings;

// @public (undocumented)
export type ISettingsMap<T> = {
    [P in keyof T]?: string;
};

// @public (undocumented)
export const IsFocusVisibleClassName = "ms-Fabric--isFocusVisible";

// @public (undocumented)
export const isIE11: () => boolean;

// @public
export const isIOS: () => boolean;

// @public (undocumented)
export interface ISize {
    // (undocumented)
    height: number;
    // (undocumented)
    width: number;
}

// @public
export function isMac(reset?: boolean): boolean;

export { IStyleFunction }

export { IStyleFunctionOrObject }

// @public
export function isVirtualElement(element: HTMLElement | IVirtualElement): element is IVirtualElement;

// @public
export interface IVirtualElement extends HTMLElement {
    // (undocumented)
    _virtual: {
        parent?: IVirtualElement;
        children: IVirtualElement[];
    };
}

// @public (undocumented)
export interface IWarnControlledUsageParams<P> {
    componentId: string;
    componentName: string;
    defaultValueProp: keyof P;
    oldProps?: P;
    onChangeProp: keyof P;
    props: P;
    readOnlyProp?: keyof P;
    valueProp: keyof P;
}

// @public
export const KeyCodes: {
    backspace: 8;
    tab: 9;
    enter: 13;
    shift: 16;
    ctrl: 17;
    alt: 18;
    pauseBreak: 19;
    capslock: 20;
    escape: 27;
    space: 32;
    pageUp: 33;
    pageDown: 34;
    end: 35;
    home: 36;
    left: 37;
    up: 38;
    right: 39;
    down: 40;
    insert: 45;
    del: 46;
    zero: 48;
    one: 49;
    two: 50;
    three: 51;
    four: 52;
    five: 53;
    six: 54;
    seven: 55;
    eight: 56;
    nine: 57;
    a: 65;
    b: 66;
    c: 67;
    d: 68;
    e: 69;
    f: 70;
    g: 71;
    h: 72;
    i: 73;
    j: 74;
    k: 75;
    l: 76;
    m: 77;
    n: 78;
    o: 79;
    p: 80;
    q: 81;
    r: 82;
    s: 83;
    t: 84;
    u: 85;
    v: 86;
    w: 87;
    x: 88;
    y: 89;
    z: 90;
    leftWindow: 91;
    rightWindow: 92;
    select: 93;
    zero_numpad: 96;
    one_numpad: 97;
    two_numpad: 98;
    three_numpad: 99;
    four_numpad: 100;
    five_numpad: 101;
    six_numpad: 102;
    seven_numpad: 103;
    eight_numpad: 104;
    nine_numpad: 105;
    multiply: 106;
    add: 107;
    subtract: 109;
    decimalPoint: 110;
    divide: 111;
    f1: 112;
    f2: 113;
    f3: 114;
    f4: 115;
    f5: 116;
    f6: 117;
    f7: 118;
    f8: 119;
    f9: 120;
    f10: 121;
    f11: 122;
    f12: 123;
    numlock: 144;
    scrollLock: 145;
    semicolon: 186;
    equalSign: 187;
    comma: 188;
    dash: 189;
    period: 190;
    forwardSlash: 191;
    graveAccent: 192;
    openBracket: 219;
    backSlash: 220;
    closeBracket: 221;
    singleQuote: 222;
};

// @public (undocumented)
export type KeyCodes = number;

// @public
export const labelProperties: Record<string, number>;

// @public
export const liProperties: Record<string, number>;

// @public
export function mapEnumByName<T>(theEnum: any, callback: (name?: string, value?: string | number) => T | undefined): (T | undefined)[] | undefined;

// @public
export function memoize<T extends Function>(target: any, key: string, descriptor: TypedPropertyDescriptor<T>): {
    configurable: boolean;
    get(): T;
};

// @public
export function memoizeFunction<T extends (...args: any[]) => RetType, RetType>(cb: T, maxCacheSize?: number, ignoreNullOrUndefinedResult?: boolean): T;

// @public
export function merge<T = {}>(target: Partial<T>, ...args: (Partial<T> | null | undefined | false)[]): T;

// @public
export function mergeAriaAttributeValues(...ariaAttributes: (string | undefined | false)[]): string | undefined;

// @public
export function mergeCustomizations(props: ICustomizerProps, parentContext: ICustomizerContext): ICustomizerContext;

// @public (undocumented)
export function mergeScopedSettings(oldSettings?: ISettings, newSettings?: ISettings | ISettingsFunction): ISettings;

// @public
export function mergeSettings(oldSettings?: ISettings, newSettings?: ISettings | ISettingsFunction): ISettings;

// @public
export function modalize(target: HTMLElement): () => void;

// @public
export function nullRender(): JSX.Element | null;

// @public
export const olProperties: Record<string, number>;

export { Omit }

// @public
export function omit<TObj extends Record<string, any>>(obj: TObj, exclusions: (keyof TObj)[]): TObj;

// @public (undocumented)
export function on(element: Element | Window, eventName: string, callback: (ev: Event) => void, options?: boolean): () => void;

// @public (undocumented)
export const optionProperties: Record<string, number>;

// @public
export interface Point {
    // (undocumented)
    left?: number;
    // (undocumented)
    top?: number;
    // @deprecated (undocumented)
    x?: number;
    // @deprecated (undocumented)
    y?: number;
}

// @public
export function portalContainsElement(target: HTMLElement, parent?: HTMLElement): boolean;

// @public
export function precisionRound(value: number, precision: number, base?: number): number;

// @public
export function raiseClick(target: Element): void;

// @public
export class Rectangle {
    constructor(left?: number, right?: number, top?: number, bottom?: number);
    // (undocumented)
    bottom: number;
    equals(rect: Rectangle): boolean;
    readonly height: number;
    // (undocumented)
    left: number;
    // (undocumented)
    right: number;
    // (undocumented)
    top: number;
    readonly width: number;
}

// @public (undocumented)
export type RefObject<T> = {
    (component: T | null): void;
    current: T | null;
};

// @public
export function removeIndex<T>(array: T[], index: number): T[];

// @public
export function replaceElement<T>(array: T[], newElement: T, index: number): T[];

// @public
export function resetControlledWarnings(): void;

// @public
export function resetIds(counter?: number): void;

// @public
export function resetMemoizations(): void;

// @public
export const safeRequestAnimationFrame: (component: React.Component<{}, {}, any>) => (cb: Function) => void;

// @public
export const safeSetTimeout: (component: React.Component<{}, {}, any>) => (cb: Function, duration: number) => void;

// @public (undocumented)
export class Selection<TItem = IObjectWithKey> implements ISelection<TItem> {
    constructor(...options: TItem extends IObjectWithKey ? [] | [ISelectionOptions<TItem>] : [ISelectionOptionsWithRequiredGetKey<TItem>]);
    // (undocumented)
    canSelectItem(item: TItem, index?: number): boolean;
    count: number;
    // (undocumented)
    getItems(): TItem[];
    // (undocumented)
    getKey(item: TItem, index?: number): string;
    // (undocumented)
    getSelectedCount(): number;
    // (undocumented)
    getSelectedIndices(): number[];
    // (undocumented)
    getSelection(): TItem[];
    // (undocumented)
    isAllSelected(): boolean;
    // (undocumented)
    isIndexSelected(index: number): boolean;
    // (undocumented)
    isKeySelected(key: string): boolean;
    // (undocumented)
    isModal(): boolean;
    // (undocumented)
    isRangeSelected(fromIndex: number, count: number): boolean;
    // (undocumented)
    readonly mode: SelectionMode;
    // (undocumented)
    selectToIndex(index: number, clearSelection?: boolean): void;
    // (undocumented)
    selectToKey(key: string, clearSelection?: boolean): void;
    // (undocumented)
    setAllSelected(isAllSelected: boolean): void;
    // (undocumented)
    setChangeEvents(isEnabled: boolean, suppressChange?: boolean): void;
    // (undocumented)
    setIndexSelected(index: number, isSelected: boolean, shouldAnchor: boolean): void;
    setItems(items: TItem[], shouldClear?: boolean): void;
    // (undocumented)
    setKeySelected(key: string, isSelected: boolean, shouldAnchor: boolean): void;
    // (undocumented)
    setModal(isModal: boolean): void;
    // (undocumented)
    toggleAllSelected(): void;
    // (undocumented)
    toggleIndexSelected(index: number): void;
    // (undocumented)
    toggleKeySelected(key: string): void;
    // (undocumented)
    toggleRangeSelected(fromIndex: number, count: number): void;
    }

// @public (undocumented)
export const SELECTION_CHANGE = "change";

// @public (undocumented)
export enum SelectionDirection {
    // (undocumented)
    horizontal = 0,
    // (undocumented)
    vertical = 1
}

// @public (undocumented)
export enum SelectionMode {
    // (undocumented)
    multiple = 2,
    // (undocumented)
    none = 0,
    // (undocumented)
    single = 1
}

// @public
export const selectProperties: Record<string, number>;

// @public
export function setBaseUrl(baseUrl: string): void;

// @public
export function setFocusVisibility(enabled: boolean, target?: Element): void;

// @public
export function setLanguage(language: string, avoidPersisting?: boolean): void;

// Warning: (ae-internal-missing-underscore) The name "setMemoizeWeakMap" should be prefixed with an underscore because the declaration is marked as @internal
//
// @internal
export function setMemoizeWeakMap(weakMap: any): void;

// @public
export function setPortalAttribute(element: HTMLElement): void;

// @public
export function setRTL(isRTL: boolean, persistSetting?: boolean): void;

// @public
export function setSSR(isEnabled: boolean): void;

// @public @deprecated (undocumented)
export type Settings = ISettings;

// @public @deprecated (undocumented)
export type SettingsFunction = ISettingsFunction;

// @public
export function setVirtualParent(child: HTMLElement, parent: HTMLElement): void;

// @public
export function setWarningCallback(warningCallback?: (message: string) => void): void;

// @public
export function shallowCompare<TA extends any, TB extends any>(a: TA, b: TB): boolean;

// @public
export function shouldWrapFocus(element: HTMLElement, noWrapDataAttribute: 'data-no-vertical-wrap' | 'data-no-horizontal-wrap'): boolean;

// @public
export function styled<TComponentProps extends IPropsWithStyles<TStyleProps, TStyleSet>, TStyleProps, TStyleSet extends IStyleSet<TStyleSet>>(Component: React.ComponentClass<TComponentProps> | React.FunctionComponent<TComponentProps>, baseStyles: IStyleFunctionOrObject<TStyleProps, TStyleSet>, getProps?: (props: TComponentProps) => Partial<TComponentProps>, customizable?: ICustomizableProps, pure?: boolean): React.FunctionComponent<TComponentProps>;

// @public (undocumented)
export function styled<TComponentProps extends IPropsWithStyles<TStyleProps, TStyleSet> & React.RefAttributes<TRef>, TStyleProps, TStyleSet extends IStyleSet<TStyleSet>, TRef = unknown>(Component: React.ComponentClass<TComponentProps> | React.FunctionComponent<TComponentProps>, baseStyles: IStyleFunctionOrObject<TStyleProps, TStyleSet>, getProps?: (props: TComponentProps) => Partial<TComponentProps>, customizable?: ICustomizableProps, pure?: boolean): React.ForwardRefExoticComponent<React.PropsWithoutRef<TComponentProps> & React.RefAttributes<TRef>>;

// @public (undocumented)
export type StyleFunction<TStyleProps, TStyleSet> = IStyleFunctionOrObject<TStyleProps, TStyleSet> & {
    __cachedInputs__: (IStyleFunctionOrObject<TStyleProps, TStyleSet> | undefined)[];
    __noStyleOverride__: boolean;
};

// @public
export const tableProperties: Record<string, number>;

// @public
export const tdProperties: Record<string, number>;

// @public
export const textAreaProperties: Record<string, number>;

// @public
export const thProperties: Record<string, number>;

// @public
export function toMatrix<T>(items: T[], columnCount: number): T[][];

// @public
export const trProperties: Record<string, number>;

// @public
export function unhoistMethods(source: any, methodNames: string[]): void;

// @public
export function useCustomizationSettings(properties: string[], scopeName?: string): ISettings;

// @public
export function useFocusRects(rootRef?: React.RefObject<HTMLElement>): void;

// @public
export function values<T>(obj: any): T[];

// @public
export const videoProperties: Record<string, number>;

// @public
export function warn(message: string): void;

// @public
export function warnConditionallyRequiredProps<P>(componentName: string, props: P, requiredProps: string[], conditionalPropName: string, condition: boolean): void;

// @public
export function warnControlledUsage<P>(params: IWarnControlledUsageParams<P>): void;

// @public
export function warnDeprecations<P>(componentName: string, props: P, deprecationMap: ISettingsMap<P>): void;

// @public
export function warnMutuallyExclusive<P>(componentName: string, props: P, exclusiveMap: ISettingsMap<P>): void;


// (No @packageDocumentation comment for this package)

```