Method has

packages/db/src/utils/nested-map.ts:26–31

(k1: K1, k2?: K2)

  has(k1: K1): boolean;
  has(k1: K1, k2: K2): boolean;
  has(k1: K1, k2?: K2): boolean {
    if (k2 === undefined) {
      return this.data.has(k1);
    }
    return this.data.get(k1)?.has(k2) ?? false;
  }

  keys(): IterableIterator<K1> {
    return this.data.keys();