async await

example.ts

export const caller = async (
  event: CallerEvent,
  context: ServerlessContext,
  callback
) => {
  // START ur code
  logger.info({ event, context });
  const { collection, time } = event;
  const args = {
    collection,
    database: "juni_db_prod",
    runId: time,
    rangeField: "creationTimestamp",
    rangeBegin: "2020-12-07T06:36:16.071+00:00",
    rangeEnd: "2020-12-09T06:37:16.071+00:00",
  };
  const invokeExecutor = (args) => {
    const params = {
      FunctionName: "mongo-extractor-dev-executor", // the lambda function we are going to invoke
      InvocationType: "RequestResponse",
      Payload: JSON.stringify(args),
    };
    return lambda.invoke(params).promise();
  };
  // END ur code

  // This....
  await invokeExecutor(args)
    .then((res) => {
      logger.info({ res: res }, "Executor completed");
      callback();
    })
    .catch((err) => logger.error({ error: err }, "Executor failed"));

  // Is the same as this...
  try {
    await invokeExecutor(args);
    logger.info({ res }, "Executor completed");
    callback();
  } catch (e) {
    logger.error({ error: err }, "Executor failed");
  }
};