Function _validateBeforeSendResult

packages/core/src/client.ts:1620–1641

* Verifies that return value of configured `beforeSend` or `beforeSendTransaction` is of expected type, and returns the value if so.

(
  beforeSendResult: PromiseLike<Event | null> | Event | null,
  beforeSendLabel: string,
)

 * Verifies that return value of configured `beforeSend` or `beforeSendTransaction` is of expected type, and returns the value if so.
 */
function _validateBeforeSendResult(
  beforeSendResult: PromiseLike<Event | null> | Event | null,
  beforeSendLabel: string,
): PromiseLike<Event | null> | Event | null {
  const invalidValueError = `${beforeSendLabel} must return \`null\` or a valid event.`;
  if (isThenable(beforeSendResult)) {
    return beforeSendResult.then(
      event => {
        if (!isPlainObject(event) && event !== null) {
          throw _makeInternalError(invalidValueError);
        }
        return event;
      },
      e => {
        throw _makeInternalError(`${beforeSendLabel} rejected with ${e}`);
      },
    );
  } else if (!isPlainObject(beforeSendResult) && beforeSendResult !== null) {
    throw _makeInternalError(invalidValueError);
  }
  return beforeSendResult;
}

/**
 * Process the matching `beforeSendXXX` callback.