Function innerFail

lib/internal/assert/utils.js:101–147

* @param {InnerFailOptions} obj

(obj)

 * @param {InnerFailOptions} obj
 */
function innerFail(obj) {
  if (obj.message.length === 0) {
    obj.message = undefined;
  } else if (typeof obj.message[0] === 'string') {
    if (obj.message.length > 1) {
      obj.message = format(...obj.message);
    } else {
      obj.message = obj.message[0];
    }
  } else if (isError(obj.message[0])) {
    if (obj.message.length > 1) {
      throw new ERR_AMBIGUOUS_ARGUMENT(
        'message',
        `The error message was passed as error object "${ErrorPrototypeToString(obj.message[0])}" has trailing arguments that would be ignored.`,
      );
    }
    throw obj.message[0];
  } else if (typeof obj.message[0] === 'function') {
    if (obj.message.length > 1) {
      throw new ERR_AMBIGUOUS_ARGUMENT(
        'message',
        `The error message with function "${obj.message[0].name || 'anonymous'}" has trailing arguments that would be ignored.`,
      );
    }
    try {
      obj.message = obj.message[0](obj.actual, obj.expected);
      if (typeof obj.message !== 'string') {
        obj.message = undefined;
      }
    } catch {
      // Ignore and use default message instead
      obj.message = undefined;
    }
  } else {
    throw new ERR_INVALID_ARG_TYPE(
      'message',
      ['string', 'function'],
      obj.message[0],
    );
  }

  const error = new AssertionError(obj);
  if (obj.generatedMessage !== undefined) {
    error.generatedMessage = obj.generatedMessage;
  }
  throw error;
}

/**
 * Internal ok handler delegating to innerFail for message handling.