sOwnProperty(importAssertions, 'type')) {
        // `type` wasn't specified at all.
        throw new ERR_IMPORT_ASSERTION_TYPE_MISSING(url, validType);
      }
      handleInvalidType(url, importAssertions.type);
  }
}

/**
 * Throw the correct error depending on what's wrong with the type assertion.
 * @param {string} url The resolved URL for the module to be imported
 * @param {string} type The value of the import assertion `type` property
 */
function handleInvalidType(url, type) {
  // `type` might have not been a string.
  validateString(type, 'type');

  // `type` might not have been one of the types we understand.
  if (!ArrayPrototypeIncludes(supportedAssertionTypes, type)) {
    throw new ERR_IMPORT_ASSERTION_TYPE_UNSUPPORTED(type);
  }

  // `type` was the wrong value for this format.
  throw new ERR_IMPORT_ASSERTION_TYPE_FAILED(url, type);
}


module.exports = {
  kImplicitAssertType,
  validateAssertions,
};