/**
 * A collection of shader chunks, used by {@link ShaderChunks}. This is a map of shader chunk names
 * to their code.  As this class extends `Map`, it can be used as a `Map` as well in addition to
 * custom functionality it provides.
 *
 * @category Graphics
 */
export class ShaderChunkMap extends Map<any, any> {
    constructor();
    constructor(entries?: readonly (readonly [any, any])[]);
    constructor();
    constructor(iterable?: Iterable<readonly [any, any]>);
    _keyDirty: boolean;
    _key: string;
    /**
     * Adds a new shader chunk with a specified name and shader source code to the Map. If an
     * element with the same name already exists, the element will be updated.
     *
     * @param {string} name - The name of the shader chunk.
     * @param {string} code - The shader source code.
     * @returns {this} The ShaderChunkMap instance.
     */
    set(name: string, code: string): this;
    /**
     * Adds multiple shader chunks to the Map. This method accepts an object where the keys are the
     * names of the shader chunks and the values are the shader source code. If an element with the
     * same name already exists, the element will be updated.
     *
     * @param {Object} object - Object containing shader chunks.
     * @returns {this} The ShaderChunkMap instance.
     */
    add(object: any): this;
    /**
     * Removes a shader chunk by name from the Map. If the element does not exist, no action is
     * taken.
     *
     * @param {string} name - The name of the shader chunk to remove.
     * @returns {boolean} True if an element in the Map existed and has been removed, or false if the
     * element does not exist.
     */
    delete(name: string): boolean;
    markDirty(): void;
    _dirty: boolean;
    isDirty(): boolean;
    resetDirty(): void;
    get key(): string;
    /**
     * Copy the shader chunk map.
     *
     * @param {ShaderChunkMap} source - The instance to copy.
     * @returns {this} The destination instance.
     * @ignore
     */
    copy(source: ShaderChunkMap): this;
}