Method loadAssetAsync

modules/core/AssetSystem.js:254–285

* loadAssetAsync * Returns a Promise to fetch the data identified by the key. * @param {string} key - identifier for the data, should be found in the asset map. * @return {Promise} Promise resolved with the data

(key)

   * @return {Promise} Promise resolved with the data
   */
  loadAssetAsync(key) {
    if (this._cache[key]) {
      return Promise.resolve(this._cache[key]);
    }

    let url;
    try {
      url = this.getAssetURL(key);
    } catch (err) {
      return Promise.reject(err.message);
    }

    let loadPromise = this._inflight[url];
    if (!loadPromise) {
      this._inflight[url] = loadPromise = fetch(url)
        .then(utilFetchResponse)
        .then(result => {
          delete this._inflight[url];
          if (!result) {
            throw new Error(`No data loaded for "${key}"`);
          }
          this._cache[key] = result;
          return result;
        })
        .catch(err => {
          delete this._inflight[url];
          throw err;
        });
    }

    return loadPromise;
  }

}