text: /*
   * Copyright 2015 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.
   */
  
  "use strict";
  
  const path = require("path");
  const stringifyCache = new Map();
  
  /**
   * @param {Array<Object>} files
   * @return {string}
   */
  module.exports = (files) => {
    if (files.length < 1) {
      return '[]';
    }
  
    let output = "[";
    for (const file of files) {
      const filePath = file.relative || path.relative(process.cwd(), file.path);
  
      if (stringifyCache.has(filePath)) {
        output += stringifyCache.get(filePath) + ",";
        continue;
      }
  
      const fileValue = {
        src: file.contents.toString(),
        path: filePath,
      };
      if (file.sourceMap) {
        fileValue.sourceMap = JSON.stringify(file.sourceMap);
      }
      stringifyCache.set(filePath, JSON.stringify(fileValue));
      output += stringifyCache.get(filePath) + ",";
    }
  
    output = output.substring(0, output.length - 1) + "]";
    return output;
  };
  