Simple channel with async generator for TypeScript(without buffers)

chan.ts

function chan<T>() {
  let p = Promise.withResolvers<T>();

  async function* gen() {
    while (true) {
      let v;
      try {
        v = await p.promise;
      } catch {
        return;
      }
      p = Promise.withResolvers<T>();
      yield v;
    }
  }

  return {
    ...gen(),
    put: p.resolve,
    close: p.reject,
  };
};