text: /*
   * Copyright 2016 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.
   */
  
  'require util/polyfill';
  'require es6/math/log1p';
  
  $jscomp.polyfill('Math.atanh', function(orig) {
    if (orig) return orig;
    var log1p = Math.log1p;
  
    /**
     * Computes the inverse hyperbolic tangent.
     *
     * <p>Polyfills the static function Math.atanh().
     *
     * @param {number} x Any number, or value that can be coerced to a number.
     * @return {number} The inverse hyperbolic tangent +x.
     */
    var polyfill = function(x) {
      x = Number(x);
      return (log1p(x) - log1p(-x)) / 2;
    };
  
    return polyfill;
  }, 'es6-impl', 'es3');
  