export declare const enum StyleAttrsKeys {
    BackgroundColor = 0,
    Color = 1,
    FontFamily = 2,
    FontSize = 3,
    FontStyle = 4,
    FontWeight = 5,
    Opacity = 6,
    Outline = 7,
    TextDecoration = 8,
    TextDecorationColor = 9,
    TextDecorationLine = 10,
    TextDecorationStyle = 11,
    VerticalAlign = 12,
    Visibility = 13
}
/**
 * Represents a map between style attribute keys and string values
 */
export type StyleAttrsDict = {
    [key in StyleAttrsKeys]?: string;
};
/**
 * Represents a function that modifies style attributes
 */
export type StyleAttrsModifierFn = (attrs: StyleAttrs) => void;
/**
 * Represents style attributes holder
 */
export declare class StyleAttrs {
    private attrArray;
    private _size;
    /**
     * Get attr
     * @param {StyleAttrKeys} key
     */
    get(key: StyleAttrsKeys): string | undefined;
    /**
     *
     * @param {StyleAttrsKeys} key
     * @param {string} value
     */
    set(key: StyleAttrsKeys, value: string): void;
    /**
     * Delete attrs
     * @param {StyleAttrKeys} key
     */
    delete(key: StyleAttrsKeys): void;
    /**
     * Merge values from another object into this one
     * @param {StyleAttrs} attrs - The attributes to merge into instance
     */
    update(attrs: StyleAttrsDict): void;
    /**
     * Delete all style attributes
     */
    clear(): void;
    /**
     * Get number of non-empty attributes
     * @returns {number} Number of non-empty attributes
     */
    get size(): number;
    /**
     * Convert object to string for insertion to `style` elelment attribute
     * @returns {string} Semi-colon separated list of key:val pairs
     */
    toString(): string;
    /**
     * Remove attributes at `keys` if present
     * @param {StyleAttrsKeys} key
     * @returns {StyleAttrsModifierFn} Modifier function
     */
    static delete(...keys: StyleAttrsKeys[]): StyleAttrsModifierFn;
    /**
     * Append `value` to space separated list if not present
     * @param {StyleAttrsKeys} key
     * @param {string} value
     * @returns {StyleAttrsModifierFn} Modifier function
     */
    static appendVal(key: StyleAttrsKeys, value: string): StyleAttrsModifierFn;
    /**
     * Remove `value` from space separated list if present
     * @param {StyleAttrsKeys} key
     * @param {string} val
     * @returns {StyleAttrsModifierFn} Modifier function
     */
    static removeVal(key: StyleAttrsKeys, value: string): StyleAttrsModifierFn;
}