export interface PolyfillArray<T> extends Array<T> {
    /** extended methods */
    peek(callbackfn: (value: number, index: number, array: this) => void, thisArg?: any): this;
    /** from es5 */
    concat(...items: ConcatArray<T>[]): PolyfillArray<T>;
    concat(...items: (T | ConcatArray<T>)[]): PolyfillArray<T>;
    reverse(): PolyfillArray<T>;
    slice(start?: number, end?: number): PolyfillArray<T>;
    splice(start: number, deleteCount?: number): PolyfillArray<T>;
    splice(start: number, deleteCount: number, ...items: T[]): PolyfillArray<T>;
    every(callbackfn: (value: T, index: number, array: PolyfillArray<T>) => unknown, thisArg?: any): boolean;
    some(callbackfn: (value: T, index: number, array: PolyfillArray<T>) => unknown, thisArg?: any): boolean;
    forEach(callbackfn: (value: T, index: number, array: PolyfillArray<T>) => void, thisArg?: any): void;
    map<U>(callbackfn: (value: T, index: number, array: PolyfillArray<T>) => U, thisArg?: any): PolyfillArray<U>;
    filter<S extends T>(callbackfn: (value: T, index: number, array: T[]) => value is S, thisArg?: any): PolyfillArray<S>;
    filter(callbackfn: (value: T, index: number, array: T[]) => unknown, thisArg?: any): PolyfillArray<T>;
    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: PolyfillArray<T>) => T): T;
    reduce(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: PolyfillArray<T>) => T, initialValue: T): T;
    reduce<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: PolyfillArray<T>) => U, initialValue: U): U;
    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: PolyfillArray<T>) => T): T;
    reduceRight(callbackfn: (previousValue: T, currentValue: T, currentIndex: number, array: PolyfillArray<T>) => T, initialValue: T): T;
    reduceRight<U>(callbackfn: (previousValue: U, currentValue: T, currentIndex: number, array: PolyfillArray<T>) => U, initialValue: U): U;
    /** from es2005.core */
    fill(value: T, start?: number, end?: number): this;
    copyWithin(target: number, start: number, end?: number): this;
}
export interface PolyfillArrayConstructor extends ArrayConstructor {
    /** extended methods */
    /** @deprecated use from() or of() directly */
    fromArray<A>(xs: A[]): PolyfillArray<A>;
    /** from es5 */
    new (arrayLength?: number): PolyfillArray<any>;
    new <T>(arrayLength: number): PolyfillArray<T>;
    new <T>(...items: T[]): PolyfillArray<T>;
    (arrayLength?: number): PolyfillArray<any>;
    <T>(arrayLength: number): PolyfillArray<T>;
    <T>(...items: T[]): PolyfillArray<T>;
    /** from es2015.core */
    from<T>(arrayLike: ArrayLike<T>): PolyfillArray<T>;
    from<T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): PolyfillArray<U>;
    of<T>(...items: T[]): PolyfillArray<T>;
}
export declare let PolyfillArray: PolyfillArrayConstructor;