cefn

/** Stricter keyof */
export type RecordKey<T> = T extends Partial<infer R> ? (R extends Record<infer K, unknown> ? K : never) : never;

/** Stricter type for members of Object.entries(t) */
export type RecordEntry<T> = { [K in RecordKey<T>]: [K, Required<T>[K]] }[RecordKey<T>];

/** Type-narrowed equivalent of Object.entries */
export function entries<T extends Readonly<NonNullable<{}>>>(obj: T) {
  return Object.entries(obj) as RecordEntry<T>[];
}

cefn

async function withMockedProperty<
  Obj extends NonNullable<unknown>,
  Name extends keyof Obj,
>(obj: Obj, name: Name, mock: Obj[Name], procedure: () => Promise<T>) {
  const originalProperty = obj[name];
  try {
    obj[name] = mock;
    await procedure();
  } finally {
    obj[name] = originalProperty;