declare module "@extra-array/copy-within" {
/**
 * Copies part of array within.
 * @param x an array
 * @param j write index (0)
 * @param i read start index (0)
 * @param I read end index (X)
 */
declare function copyWithin<T>(x: T[], j?: number, i?: number, I?: number): T[];
export = copyWithin;
//# sourceMappingURL=copyWithin.d.ts.map}