Function waitFor

packages/server/test/ws-broadcast.e2e.test.ts:425–432

Spin until `cond()` returns true or 2s elapses.

(cond: () => boolean)

/** Spin until `cond()` returns true or 2s elapses. */
async function waitFor(cond: () => boolean): Promise<void> {
  const deadline = Date.now() + 2000;
  while (Date.now() < deadline) {
    if (cond()) return;
    await new Promise((r) => setTimeout(r, 10));
  }
  throw new Error('waitFor: condition not satisfied within 2000ms');
}