com.google.javascript.jscomp.js.es6.string.trimstart.js Maven / Gradle / Ivy

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/*
 * Copyright 2019 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @fileoverview
 * @suppress {uselessCode}
 */
'require util/polyfill';

// Most browsers implemented trimLeft around ES5-time-frame, but it wasn't
// officially part of the language specification until ES_2019, so we have
// to provide a polyfill for it.
// IE11 doesn't have it, of course...
$jscomp.polyfill('String.prototype.trimLeft', function(orig) {
  /**
   * @this {string}
   * @return {string}
   */
  function polyfill() {
    return this.replace(/^[\s\xa0]+/, '');
  }
  return orig || polyfill;
}, 'es_2019', 'es3');

$jscomp.polyfill('String.prototype.trimStart', function(orig) {
  return orig || String.prototype.trimLeft;
}, 'es_2019', 'es3');