angular-cn/tools/broccoli/broccoli-filter.d.ts

interface FilterOptions {
  extensions?: string[]
}

declare class Filter {
  constructor(inputTree: any, options?: FilterOptions);
  processString(contents: string, relativePath: string): string;
  // NB: This function is probably not intended as part of the public API
  processFile(srcDir: string, destDir: string, relativePath: string): Promise<any>;
}

export = Filter;