Method exec

ch2-patterns/rpc-worker.js:17–27

(method, ...args)

  }
// THIS LINE SHOULD NOT APPEAR IN PRINT
  exec(method, ...args) {
    const id = ++this.next_command_id;
    let resolve, reject;
    const promise = new Promise((res, rej) => {
      resolve = res;
      reject = rej;
    });
    this.in_flight_commands.set(id, { resolve, reject });
    this.worker.postMessage({ method, params: args, id });
    return promise;
  }
}