hunk.code_window:     }, appConfig).buildConfig();
       const webpackCompiler = webpack(config);
       return new Promise((resolve, reject) => {
         const callback: webpack.compiler.CompilerCallback = (err, stats) => {
  
hunk.labels: keep keep add keep keep keep
hunk.after_edit:     webpackCompiler.outputFileSystem = new MemoryFS();
  
hunk.file_path: packages/@angular/cli/tasks/extract-i18n.ts
hunk.type: add
file: 
  export class JsonSchemaErrorBase extends Error {
    constructor(message?: string) {
      super();
  
      if (message) {
        this.message = message;
      } else {
        this.message = (<any>this.constructor).name;
      }
    }
  }
  