Function getInstance

validator/js/nodejs/index.js:288–314

* Provided a URL or a filename from which to fetch the validator_wasm.js * file, fetches, instantiates, and caches the validator instance * asynchronously. If you prefer to implement your own fetching / * caching logic, you may want to consider newInstance() instead, * which is synchronous and

(opt_validatorJs, opt_userAgent)

 * @export
 */
function getInstance(opt_validatorJs, opt_userAgent) {
  const validatorJs =
      opt_validatorJs || 'https://cdn.ampproject.org/v0/validator_wasm.js';
  const userAgent = opt_userAgent || DEFAULT_USER_AGENT;
  if (instanceByValidatorJs.hasOwnProperty(validatorJs)) {
    return Promise.resolve(instanceByValidatorJs[validatorJs]);
  }
  const validatorJsPromise = isHttpOrHttpsUrl(validatorJs) ?
    readFromUrl(validatorJs, userAgent) :
    readFromFile(validatorJs);
  return validatorJsPromise.then(function(scriptContents) {
    let instance;
    try {
      instance = new Validator(scriptContents);
    } catch (error) {
      // It may be useful to cache errors and exceptions encountered
      // here, but for now we don't do this for e.g. http errors when
      // fetching the validator, so we shouldn't do it for syntax
      // errors etc. either (which lead to the varructor throwing an error).
      throw error;
    }
    instanceByValidatorJs[validatorJs] = instance;
    return instance;
  }).then(function(instance) {
    return instance.init().then(() => instance);
  });
}
exports.getInstance = getInstance;

/**