Function validateAttributes

lib/internal/modules/esm/assert.js:55–92

* Test a module's import attributes. * @param {string} url The URL of the imported module, for error reporting. * @param {string} format One of Node's supported translators * @param {Record } importAttributes Validations for the * module import. * @returns {true} * @throws {Ty

(url, format,
                            importAttributes = { __proto__: null })

 * @throws {TypeError} If the format and type attribute are incompatible.
 */
function validateAttributes(url, format,
                            importAttributes = { __proto__: null }) {
  const keys = ObjectKeys(importAttributes);
  for (let i = 0; i < keys.length; i++) {
    if (keys[i] !== 'type') {
      throw new ERR_IMPORT_ATTRIBUTE_UNSUPPORTED(keys[i], importAttributes[keys[i]], url);
    }
  }
  const validType = formatTypeMap[format];

  switch (validType) {
    case undefined:
      // Ignore attributes for module formats we don't recognize, to allow new
      // formats in the future.
      return true;

    case kImplicitTypeAttribute:
      // This format doesn't allow an import type attribute, so the property
      // must not be set on the import attributes object.
      if (!ObjectPrototypeHasOwnProperty(importAttributes, 'type')) {
        return true;
      }
      return handleInvalidType(url, importAttributes.type);

    case importAttributes.type:
      // The type attribute is the valid type for this format.
      return true;

    default:
      // There is an expected type for this format, but the value of
      // `importAttributes.type` might not have been it.
      if (!ObjectPrototypeHasOwnProperty(importAttributes, 'type')) {
        // `type` wasn't specified at all.
        throw new ERR_IMPORT_ATTRIBUTE_MISSING(url, 'type', validType);
      }
      return handleInvalidType(url, importAttributes.type);
  }
}

/**
 * Throw the correct error depending on what's wrong with the type attribute.