{
// (undocumented)
access(item: T): K | undefined;
// (undocumented)
bust(): void;
// (undocumented)
get(item: P, cb: (item: P) => K): NonNullable;
// (undocumented)
has(item: T): boolean;
// (undocumented)
invalidate(item: T): void;
// (undocumented)
items: WeakMap