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build_web.dart
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build_web.dart
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// Copyright 2014 The Flutter 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 '../base/common.dart';
import '../base/file_system.dart';
import '../base/utils.dart';
import '../build_info.dart';
import '../features.dart';
import '../globals.dart' as globals;
import '../project.dart';
import '../runner/flutter_command.dart'
show DevelopmentArtifact, FlutterCommandResult, FlutterOptions;
import '../web/compile.dart';
import '../web/file_generators/flutter_service_worker_js.dart';
import '../web/web_constants.dart';
import '../web_template.dart';
import 'build.dart';
class BuildWebCommand extends BuildSubCommand {
BuildWebCommand({
required super.logger,
required FileSystem fileSystem,
required bool verboseHelp,
}) : _fileSystem = fileSystem, super(verboseHelp: verboseHelp) {
addTreeShakeIconsFlag();
usesTargetOption();
usesOutputDir();
usesPubOption();
usesBuildNumberOption();
usesBuildNameOption();
addBuildModeFlags(verboseHelp: verboseHelp, excludeDebug: true);
usesDartDefineOption();
addEnableExperimentation(hide: !verboseHelp);
addNullSafetyModeOptions(hide: !verboseHelp);
addNativeNullAssertions();
//
// Flutter web-specific options
//
argParser.addSeparator('Flutter web options');
argParser.addOption('base-href',
help: 'Overrides the href attribute of the <base> tag in web/index.html. '
'No change is done to web/index.html file if this flag is not provided. '
'The value has to start and end with a slash "/". '
'For more information: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base'
);
argParser.addOption(
'pwa-strategy',
defaultsTo: ServiceWorkerStrategy.offlineFirst.cliName,
help: 'The caching strategy to be used by the PWA service worker.',
allowed: ServiceWorkerStrategy.values.map((ServiceWorkerStrategy e) => e.cliName),
allowedHelp: CliEnum.allowedHelp(ServiceWorkerStrategy.values),
);
usesWebRendererOption();
usesWebResourcesCdnFlag();
//
// Common compilation options among JavaScript and Wasm
//
argParser.addOption(
'optimization-level',
abbr: 'O',
help:
'Sets the optimization level used for Dart compilation to JavaScript/Wasm.',
defaultsTo: '${WebCompilerConfig.kDefaultOptimizationLevel}',
allowed: const <String>['0', '1', '2', '3', '4'],
);
//
// JavaScript compilation options
//
argParser.addSeparator('JavaScript compilation options');
argParser.addFlag('csp',
negatable: false,
help: 'Disable dynamic generation of code in the generated output. '
'This is necessary to satisfy CSP restrictions (see http://www.w3.org/TR/CSP/).'
);
argParser.addFlag(
'source-maps',
help: 'Generate a sourcemap file. These can be used by browsers '
'to view and debug the original source code of a compiled and minified Dart '
'application.'
);
argParser.addOption('dart2js-optimization',
help: 'Sets the optimization level used for Dart compilation to JavaScript. '
'Deprecated: Please use "-O=<level>" / "--optimization-level=<level>".',
allowed: const <String>['O1', 'O2', 'O3', 'O4'],
);
argParser.addFlag('dump-info', negatable: false,
help: 'Passes "--dump-info" to the Javascript compiler which generates '
'information about the generated code is a .js.info.json file.'
);
argParser.addFlag('no-frequency-based-minification', negatable: false,
help: 'Disables the frequency based minifier. '
'Useful for comparing the output between builds.'
);
//
// WebAssembly compilation options
//
argParser.addSeparator('WebAssembly compilation options');
argParser.addFlag(
FlutterOptions.kWebWasmFlag,
help: 'Compile to WebAssembly (with fallback to JavaScript).\n$kWasmMoreInfo',
negatable: false,
);
argParser.addFlag(
'strip-wasm',
help: 'Whether to strip the resulting wasm file of static symbol names.',
defaultsTo: true,
);
}
final FileSystem _fileSystem;
@override
Future<Set<DevelopmentArtifact>> get requiredArtifacts async =>
const <DevelopmentArtifact>{
DevelopmentArtifact.web,
};
@override
final String name = 'web';
@override
bool get hidden => !featureFlags.isWebEnabled;
@override
final String description = 'Build a web application bundle.';
@override
Future<FlutterCommandResult> runCommand() async {
if (!featureFlags.isWebEnabled) {
throwToolExit('"build web" is not currently supported. To enable, run "flutter config --enable-web".');
}
final int optimizationLevel = int.parse(stringArg('optimization-level')!);
final String? dart2jsOptimizationLevelValue = stringArg('dart2js-optimization');
final int jsOptimizationLevel = dart2jsOptimizationLevelValue != null
? int.parse(dart2jsOptimizationLevelValue.substring(1))
: optimizationLevel;
final List<WebCompilerConfig> compilerConfigs;
if (boolArg('wasm')) {
if (stringArg(FlutterOptions.kWebRendererFlag) != argParser.defaultFor(FlutterOptions.kWebRendererFlag)) {
throwToolExit('"--${FlutterOptions.kWebRendererFlag}" cannot be combined with "--${FlutterOptions.kWebWasmFlag}"');
}
globals.logger.printBox(
title: 'New feature',
'''
WebAssembly compilation is new. Understand the details before deploying to production.
$kWasmMoreInfo''',
);
compilerConfigs = <WebCompilerConfig>[
WasmCompilerConfig(
optimizationLevel: optimizationLevel,
stripWasm: boolArg('strip-wasm'),
renderer: WebRendererMode.skwasm,
),
JsCompilerConfig(
csp: boolArg('csp'),
optimizationLevel: jsOptimizationLevel,
dumpInfo: boolArg('dump-info'),
nativeNullAssertions: boolArg('native-null-assertions'),
noFrequencyBasedMinification: boolArg('no-frequency-based-minification'),
sourceMaps: boolArg('source-maps'),
renderer: WebRendererMode.canvaskit,
)];
} else {
WebRendererMode webRenderer = WebRendererMode.auto;
if (argParser.options.containsKey(FlutterOptions.kWebRendererFlag)) {
webRenderer = WebRendererMode.values.byName(stringArg(FlutterOptions.kWebRendererFlag)!);
}
compilerConfigs = <WebCompilerConfig>[JsCompilerConfig(
csp: boolArg('csp'),
optimizationLevel: jsOptimizationLevel,
dumpInfo: boolArg('dump-info'),
nativeNullAssertions: boolArg('native-null-assertions'),
noFrequencyBasedMinification: boolArg('no-frequency-based-minification'),
sourceMaps: boolArg('source-maps'),
renderer: webRenderer,
)];
}
final FlutterProject flutterProject = FlutterProject.current();
final String target = stringArg('target')!;
final BuildInfo buildInfo = await getBuildInfo();
if (buildInfo.isDebug) {
throwToolExit('debug builds cannot be built directly for the web. Try using "flutter run"');
}
final String? baseHref = stringArg('base-href');
if (baseHref != null && !(baseHref.startsWith('/') && baseHref.endsWith('/'))) {
throwToolExit(
'Received a --base-href value of "$baseHref"\n'
'--base-href should start and end with /',
);
}
if (!flutterProject.web.existsSync()) {
throwToolExit('Missing index.html.');
}
if (!_fileSystem.currentDirectory
.childDirectory('web')
.childFile('index.html')
.readAsStringSync()
.contains(kBaseHrefPlaceholder) &&
baseHref != null) {
throwToolExit(
"Couldn't find the placeholder for base href. "
'Please add `<base href="$kBaseHrefPlaceholder">` to web/index.html'
);
}
// Currently supporting options [output-dir] and [output] as
// valid approaches for setting output directory of build artifacts
final String? outputDirectoryPath = stringArg('output');
displayNullSafetyMode(buildInfo);
final WebBuilder webBuilder = WebBuilder(
logger: globals.logger,
processManager: globals.processManager,
buildSystem: globals.buildSystem,
fileSystem: globals.fs,
flutterVersion: globals.flutterVersion,
usage: globals.flutterUsage,
analytics: globals.analytics,
);
await webBuilder.buildWeb(
flutterProject,
target,
buildInfo,
ServiceWorkerStrategy.fromCliName(stringArg('pwa-strategy')),
compilerConfigs: compilerConfigs,
baseHref: baseHref,
outputDirectoryPath: outputDirectoryPath,
);
return FlutterCommandResult.success();
}
}