code: function AssetManifestGenerator(inputTrees, options) {
    options = options || {};
  
    this.prepend = options.prepend || '';
    this.filesToIgnore = options.filesToIgnore || [];
    this.supportedTypes = options.supportedTypes || DEFAULT_SUPPORTED_TYPES;
    this.generateURI = options.generateURI || function generateURI(filePath) {
      return filePath;
    };
  
    Plugin.call(this, inputTrees, {
      annotation: options.annotation
    });
  }
docs: A Broccoli plugin to generate an asset manifest from a given input tree.
  You can also provide a second tree that is a tree containing an existing
  `asset-manifest.json` file to merge with.
  
  @class AssetManifestGenerator
  @extends BroccoliCachingWriter