All files / src/lib stringify.ts

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/**
 * Copyright 2018 Google Inc. All Rights Reserved.
 *
 * 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.
 */
 
/**
 * Stringfy a POJO and preserve its functions.
 *
 * Courtesy of @cowboy
 * https://gist.github.com/cowboy/3749767
 * @param obj
 */
export function stringify(obj: object) {
  const placeholder = '____PLACEHOLDER____';
  const fns: string[] = [];
 
  let json = JSON.stringify(obj, (key: string, value: string) => {
    if (typeof value === 'function') {
      fns.push(value);
      return placeholder;
    }
 
    return value;
  }, 2);
 
  json = json.replace(new RegExp('"' + placeholder + '"', 'g'), () => {
    const result = fns.shift();
    if (!result) {
      return '';
    }
 
    return result;
  });
 
  return json + ';';
}