packages/flutter_tools/lib/src/commands/build_web.dart

// Copyright 2019 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 '../base/common.dart';
import '../base/logger.dart';
import '../build_info.dart';
import '../globals.dart';
import '../runner/flutter_command.dart'
    show DevelopmentArtifact, FlutterCommandResult;
import '../web/compile.dart';
import 'build.dart';

class BuildWebCommand extends BuildSubCommand {
  BuildWebCommand() {
    usesTargetOption();
    usesPubOption();
    addBuildModeFlags();
  }

  @override
  Future<Set<DevelopmentArtifact>> get requiredArtifacts async =>
      const <DevelopmentArtifact>{
        DevelopmentArtifact.universal,
        DevelopmentArtifact.web,
      };

  @override
  final String name = 'web';

  @override
  bool get hidden => true;

  @override
  bool get isExperimental => true;

  @override
  final String description = '(EXPERIMENTAL) build a web application bundle.';

  @override
  Future<FlutterCommandResult> runCommand() async {
    final String target = argResults['target'];
    final Status status = logger
        .startProgress('Compiling $target for the Web...', timeout: null);
    final BuildInfo buildInfo = getBuildInfo();
    int result;
    switch (buildInfo.mode) {
      case BuildMode.release:
        result = await webCompiler.compileDart2js(target: target);
        break;
      case BuildMode.profile:
        result = await webCompiler.compileDart2js(target: target, minify: false);
        break;
      case BuildMode.debug:
        throwToolExit(
            'Debug mode is not supported as a build target. Instead use '
            '"flutter run -d web".');
        break;
      case BuildMode.dynamicProfile:
      case BuildMode.dynamicRelease:
        throwToolExit(
            'Build mode ${buildInfo.mode} is not supported with JavaScript '
            'compilation');
        break;
    }
    status.stop();
    if (result == 1) {
      throwToolExit('Failed to compile $target to JavaScript.');
    }
    return null;
  }
}