// Copyright 2017 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import 'dart:async'; import 'dart:ui' show VoidCallback; List<String> captureOutput(VoidCallback fn) { final List<String> log = <String>[]; runZoned<Null>(fn, zoneSpecification: new ZoneSpecification( print: (Zone self, ZoneDelegate parent, Zone zone, String line) { log.add(line); }, )); return log; }