WeakRef type definition

weakref.d.ts

/**
 * WeakRef is supported by major browsers but doesn't appear to be available in
 * Typescript 4.0.5. Here is a temporary type definition until TypeScript adds
 * native support.
 *
 * See https://github.com/microsoft/TypeScript/issues/32393
 */

interface WeakRef<V> {
  deref(): V | undefined;
}

interface WeakRefConstructor {
  new <V = any>(v: V): WeakRef<V>;
  readonly prototype: WeakRef<any>;
}
/* eslint-disable-next-line @typescript-eslint/no-redeclare */
declare var WeakRef: WeakRefConstructor;