pkg/dev_compiler/tool/ddb - sdk.git - Git at Google

 #!/usr/bin/env dart
 // Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 // @dart = 2.9

 //
 // Compiles code with DDC and runs the resulting code with either node or
 // chrome.
 //
 // The first script supplied should be the one with `main()`.
 //
 // Saves the output in the same directory as the sources for convenient
 // inspection, modification or rerunning the code.

 import 'dart:io';

 import 'package:args/args.dart' show ArgParser;
 import 'package:path/path.dart' as p;
 import 'package:dev_compiler/src/compiler/module_builder.dart'
     as module_builder;

 enum NullSafety { strict, weak, disabled }

 void main(List<String> args) async {
   void printUsage() {
     print('Usage: ddb [options] <dart-script-file>\n');
     print('Compiles <dart-script-file> with the dev_compiler and runs it on a '
         'JS platform.\n');
   }

   // Parse flags.
   var parser = ArgParser(usageLineLength: 80)
     ..addOption('binary', abbr: 'b', help: 'Runtime binary path.')
     ..addOption('compile-vm-options',
         help: 'DART_VM_OPTIONS for the compilation VM.')
     ..addFlag('debug',
         abbr: 'd',
         help: 'Use current source instead of built SDK.',
         defaultsTo: false)
     ..addMultiOption('enable-experiment',
         help: 'Run with specified experiments enabled.')
     ..addFlag('help', abbr: 'h', help: 'Display this message.')
     ..addOption('mode',
         help: 'Option to (compile|run|all). Default is all (compile and run).',
         allowed: ['compile', 'run', 'all'],
         defaultsTo: 'all')
     ..addFlag('sound-null-safety',
         help: 'Compile for sound null safety at runtime. Passed through to the '
             'DDC binary. Defaults to false.',
         defaultsTo: false)
     ..addFlag('null-assertions',
         help: 'Run with assertions that values passed to non-nullable method '
             'parameters are not null.',
         defaultsTo: false)
     ..addFlag('native-null-assertions',
         help: 'Run with assertions on non-nullable values returned from native '
             'APIs.',
         defaultsTo: true,
         negatable: true)
     ..addFlag('weak-null-safety-errors',
         help: 'Treat weak null safety warnings as errors.', defaultsTo: false)
     ..addFlag('observe',
         help:
             'Run the compiler in the Dart VM with --observe. Implies --debug.',
         defaultsTo: false)
     ..addOption('out', help: 'Output file.')
     ..addOption('packages', help: 'Where to find a package spec file.')
     ..addOption('port',
         abbr: 'p',
         help: 'Run with the corresponding chrome/V8 debugging port open.',
         defaultsTo: '9222')
     ..addOption('runtime',
         abbr: 'r',
         help: 'Platform to run on (node|d8|chrome).  Default is node.',
         allowed: ['node', 'd8', 'chrome'],
         defaultsTo: 'node')
     ..addFlag('summarize-text',
         help: 'Emit API summary in a .js.txt file.', defaultsTo: false)
     ..addMultiOption('summary',
         abbr: 's',
         help: 'summary file(s) of imported libraries, optionally with module '
             'import path: -s path.sum=js/import/path')
     ..addFlag('verbose',
         abbr: 'v',
         help: 'Echos the commands, arguments, and environment this script is '
             'running.',
         defaultsTo: false)
     ..addOption('vm-service-port',
         help: 'Specify the observatory port. Implied --observe.');

   var options = parser.parse(args);
   if (options['help'] as bool) {
     printUsage();
     print('Available options:');
     print(parser.usage);
     exit(0);
   }
   if (options.rest.length != 1) {
     print('Dart script file required.\n');
     printUsage();
     exit(1);
   }
   var debug = options['debug'] as bool ||
       options['observe'] as bool ||
       options.wasParsed('vm-service-port');
   var summarizeText = options['summarize-text'] as bool;
   var binary = options['binary'] as String;
   var experiments = options['enable-experiment'] as List;
   var summaries = options['summary'] as List;
   var port = int.parse(options['port'] as String);
   var mode = options['mode'] as String;
   var compile = mode == 'compile' || mode == 'all';
   var run = mode == 'run' || mode == 'all';
   var verbose = options['verbose'] as bool;
   var soundNullSafety = options['sound-null-safety'] as bool;
   var nonNullAsserts = options['null-assertions'] as bool;
   var nativeNonNullAsserts = options['null-assertions'] as bool;
   var weakNullSafetyErrors = options['weak-null-safety-errors'] as bool;
   var entry = p.canonicalize(options.rest.first);
   var out = (options['out'] as String) ?? p.setExtension(entry, '.js');
   var libRoot = p.dirname(entry);
   var basename = p.basenameWithoutExtension(entry);
   var libname =
       module_builder.pathToJSIdentifier(p.relative(p.withoutExtension(entry)));

   // By default (no `-d`), we use the `dartdevc` binary on the user's path to
   // compute the SDK we use for execution.  I.e., we assume that `dart` is
   // under `$DART_SDK/bin/dart` and use that to find `dartdevc` and related
   // artifacts.  In this mode, this script can run against any installed SDK.
   // If you want to run against a freshly built SDK, that must be first on
   // your path.
   var dartBinary = Platform.resolvedExecutable;
   var dartSdk = p.dirname(p.dirname(dartBinary));

   // In debug mode (`-d`), we run from the `pkg/dev_compiler` sources.  We
   // determine the location via this actual script (i.e., `-d` assumes
   // this script remains under to `tool` sub-directory).
   var toolPath =
       Platform.script.normalizePath().toFilePath(windows: Platform.isWindows);
   var ddcPath = p.dirname(p.dirname(toolPath));
   var dartCheckoutPath = p.dirname(p.dirname(ddcPath));

   /// Runs the [command] with [args] in [environment].
   ///
   /// Will echo the commands to the console before running them when running in
   /// `verbose` mode.
   Future<Process> startProcess(String name, String command, List<String> args,
       [Map<String, String> environment = const {}]) {
     if (verbose) {
       print('Running $name:\n$command ${args.join(' ')}\n');
       if (environment.isNotEmpty) {
         var environmentVariables =
             environment.entries.map((e) => '${e.key}: ${e.value}').join('\n');
         print('With Environment:\n$environmentVariables\n');
       }
     }
     return Process.start(command, args,
         mode: ProcessStartMode.inheritStdio, environment: environment);
   }

   Future<void> runDdc(String command, List<String> args) async {
     if (debug) {
       // Use unbuilt script.  This only works from a source checkout.
       var vmServicePort = options.wasParsed('vm-service-port')
           ? '=${options['vm-service-port']}'
           : '';
       var observe =
           options.wasParsed('vm-service-port') || options['observe'] as bool;
       args.insertAll(0, [
         if (observe) ...[
           '--enable-vm-service$vmServicePort',
           '--pause-isolates-on-start',
         ],
         '--enable-asserts',
         p.join(ddcPath, 'bin', '$command.dart')
       ]);
       command = dartBinary;
     } else {
       // Use built snapshot.
       command = p.join(dartSdk, 'bin', command);
     }
     var process = await startProcess('DDC', command, args, <String, String>{
       if (options['compile-vm-options'] != null)
         'DART_VM_OPTIONS': options['compile-vm-options'] as String
     });
     if (await process.exitCode != 0) exit(await process.exitCode);
   }

   String mod;
   bool chrome = false;
   bool node = false;
   bool d8 = false;
   switch (options['runtime'] as String) {
     case 'node':
       node = true;
       mod = 'common';
       break;
     case 'd8':
       d8 = true;
       mod = 'legacy';
       break;
     case 'chrome':
       chrome = true;
       mod = 'amd';
       break;
   }

   var sdkRoot = p.dirname(p.dirname(ddcPath));
   var buildDir =
       p.join(sdkRoot, Platform.isMacOS ? 'xcodebuild' : 'out', 'ReleaseX64');
   var requirePath = p.join(sdkRoot, 'third_party', 'requirejs');
   var sdkOutlineDill = p.join(buildDir,
       soundNullSafety ? 'ddc_outline_sound.dill' : 'ddc_outline.dill');
   var suffix = soundNullSafety ? p.join('sound', mod) : p.join('kernel', mod);
   var sdkJsPath = p.join(buildDir, 'gen', 'utils', 'dartdevc', suffix);

   // Print an initial empty line to separate the invocation from the output.
   if (verbose) {
     print('');
   }

   if (compile) {
     var ddcArgs = [
       if (summarizeText) '--summarize-text',
       '--modules=$mod',
       '--dart-sdk-summary=$sdkOutlineDill',
       for (var summary in summaries) '--summary=$summary',
       for (var experiment in experiments) '--enable-experiment=$experiment',
       if (soundNullSafety) '--sound-null-safety',
       if (options['packages'] != null) '--packages=${options['packages']}',
       '-o',
       out,
       entry
     ];
     await runDdc('dartdevc', ddcArgs);
   }

   if (run) {
     if (chrome) {
       String chromeBinary;
       if (binary != null) {
         chromeBinary = binary;
       } else if (Platform.isWindows) {
         chromeBinary =
             'C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe';
       } else if (Platform.isMacOS) {
         chromeBinary =
             '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome';
       } else {
         // Assume Linux
         chromeBinary = 'google-chrome';
       }

       var html = '''
 <script src='$requirePath/require.js'></script>
 <script>
   require.config({
     paths: {
         'dart_sdk': '$sdkJsPath/dart_sdk',
     },
     waitSeconds: 15
   });
   require(['dart_sdk', '$basename'],
         function(sdk, app) {
     'use strict';

     sdk.dart.weakNullSafetyWarnings(
         !($weakNullSafetyErrors || $soundNullSafety));
     sdk.dart.weakNullSafetyErrors($weakNullSafetyErrors);
     sdk.dart.nonNullAsserts($nonNullAsserts);
     sdk.dart.nativeNonNullAsserts($nativeNonNullAsserts);
     sdk._debugger.registerDevtoolsFormatter();
     app.$libname.main([]);
   });
 </script>
 ''';
       var htmlFile = p.setExtension(out, '.html');
       File(htmlFile).writeAsStringSync(html);
       var tmp = p.join(Directory.systemTemp.path, 'ddc');

       var process = await startProcess('Chrome', chromeBinary, [
         '--auto-open-devtools-for-tabs',
         '--allow-file-access-from-files',
         '--remote-debugging-port=$port',
         '--user-data-dir=$tmp',
         htmlFile
       ]);
       if (await process.exitCode != 0) exit(await process.exitCode);
     } else if (node) {
       var nodePath = '$sdkJsPath:$libRoot';
       var runjs = '''
 let source_maps;
 try {
   source_maps = require('source-map-support');
   source_maps.install();
 } catch(e) {
 }
 let sdk = require(\"dart_sdk\");
 // Create a self reference for JS interop tests that set fields on self.
 sdk.dart.global.self = sdk.dart.global;
 let main = require(\"./$basename\").$libname.main;
 try {
   sdk.dart.weakNullSafetyWarnings(
       !($weakNullSafetyErrors || $soundNullSafety));
   sdk.dart.weakNullSafetyErrors($weakNullSafetyErrors);
   sdk.dart.nonNullAsserts($nonNullAsserts);
   sdk.dart.nativeNonNullAsserts($nativeNonNullAsserts);
   sdk._isolate_helper.startRootIsolate(main, []);
 } catch(e) {
   if (!source_maps) {
     console.log('For Dart source maps: npm install source-map-support');
   }
   sdk.core.print(sdk.dart.stackTrace(e));
   process.exit(1);
 }
 ''';
       var nodeFile = p.setExtension(out, '.run.js');
       File(nodeFile).writeAsStringSync(runjs);
       var nodeBinary = binary ?? 'node';
       var process = await startProcess('Node', nodeBinary,
           ['--inspect=localhost:$port', nodeFile], {'NODE_PATH': nodePath});
       if (await process.exitCode != 0) exit(await process.exitCode);
     } else if (d8) {
       // Fix SDK import.  `d8` doesn't let us set paths, so we need a full path
       // to the SDK.

       var jsFile = File(out);
       var jsContents = jsFile.readAsStringSync();
       jsContents = jsContents.replaceFirst(
           "from 'dart_sdk.js'", "from '$sdkJsPath/dart_sdk.js'");
       jsFile.writeAsStringSync(jsContents);

       var runjs = '''
 load("$ddcPath/lib/js/legacy/dart_library.js");
 load("$sdkJsPath/dart_sdk.js");
 load("$out");

 let sdk = dart_library.import('dart_sdk');
 // Create a self reference for JS interop tests that set fields on self.
 sdk.dart.global.self = sdk.dart.global;
 sdk.dart.weakNullSafetyWarnings(
     !($weakNullSafetyErrors || $soundNullSafety));
 sdk.dart.weakNullSafetyErrors($weakNullSafetyErrors);
 sdk.dart.nonNullAsserts($nonNullAsserts);
 sdk.dart.nativeNonNullAsserts($nativeNonNullAsserts);
 dart_library.start('$basename', '$libname');
 ''';
       var d8File = p.setExtension(out, '.d8.js');
       File(d8File).writeAsStringSync(runjs);
       var d8Binary = binary ?? p.join(dartCheckoutPath, _d8executable);
       var process = await startProcess('D8', d8Binary, ['--module', d8File]);
       if (await process.exitCode != 0) exit(await process.exitCode);
     }
   }
 }

 String get _d8executable {
   if (Platform.isWindows) {
     return p.join('third_party', 'd8', 'windows', 'd8.exe');
   } else if (Platform.isLinux) {
     return p.join('third_party', 'd8', 'linux', 'd8');
   } else if (Platform.isMacOS) {
     return p.join('third_party', 'd8', 'macos', 'd8');
   }
   throw UnsupportedError('Unsupported platform.');
 }
	#!/usr/bin/env dart
	// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	// @dart = 2.9

	//
	// Compiles code with DDC and runs the resulting code with either node or
	// chrome.
	//
	// The first script supplied should be the one with `main()`.
	//
	// Saves the output in the same directory as the sources for convenient
	// inspection, modification or rerunning the code.

	import 'dart:io';

	import 'package:args/args.dart' show ArgParser;
	import 'package:path/path.dart' as p;
	import 'package:dev_compiler/src/compiler/module_builder.dart'
	as module_builder;

	enum NullSafety { strict, weak, disabled }

	void main(List<String> args) async {
	void printUsage() {
	print('Usage: ddb [options] <dart-script-file>\n');
	print('Compiles <dart-script-file> with the dev_compiler and runs it on a '
	'JS platform.\n');
	}

	// Parse flags.
	var parser = ArgParser(usageLineLength: 80)
	..addOption('binary', abbr: 'b', help: 'Runtime binary path.')
	..addOption('compile-vm-options',
	help: 'DART_VM_OPTIONS for the compilation VM.')
	..addFlag('debug',
	abbr: 'd',
	help: 'Use current source instead of built SDK.',
	defaultsTo: false)
	..addMultiOption('enable-experiment',
	help: 'Run with specified experiments enabled.')
	..addFlag('help', abbr: 'h', help: 'Display this message.')
	..addOption('mode',
	help: 'Option to (compile\|run\|all). Default is all (compile and run).',
	allowed: ['compile', 'run', 'all'],
	defaultsTo: 'all')
	..addFlag('sound-null-safety',
	help: 'Compile for sound null safety at runtime. Passed through to the '
	'DDC binary. Defaults to false.',
	defaultsTo: false)
	..addFlag('null-assertions',
	help: 'Run with assertions that values passed to non-nullable method '
	'parameters are not null.',
	defaultsTo: false)
	..addFlag('native-null-assertions',
	help: 'Run with assertions on non-nullable values returned from native '
	'APIs.',
	defaultsTo: true,
	negatable: true)
	..addFlag('weak-null-safety-errors',
	help: 'Treat weak null safety warnings as errors.', defaultsTo: false)
	..addFlag('observe',
	help:
	'Run the compiler in the Dart VM with --observe. Implies --debug.',
	defaultsTo: false)
	..addOption('out', help: 'Output file.')
	..addOption('packages', help: 'Where to find a package spec file.')
	..addOption('port',
	abbr: 'p',
	help: 'Run with the corresponding chrome/V8 debugging port open.',
	defaultsTo: '9222')
	..addOption('runtime',
	abbr: 'r',
	help: 'Platform to run on (node\|d8\|chrome). Default is node.',
	allowed: ['node', 'd8', 'chrome'],
	defaultsTo: 'node')
	..addFlag('summarize-text',
	help: 'Emit API summary in a .js.txt file.', defaultsTo: false)
	..addMultiOption('summary',
	abbr: 's',
	help: 'summary file(s) of imported libraries, optionally with module '
	'import path: -s path.sum=js/import/path')
	..addFlag('verbose',
	abbr: 'v',
	help: 'Echos the commands, arguments, and environment this script is '
	'running.',
	defaultsTo: false)
	..addOption('vm-service-port',
	help: 'Specify the observatory port. Implied --observe.');

	var options = parser.parse(args);
	if (options['help'] as bool) {
	printUsage();
	print('Available options:');
	print(parser.usage);
	exit(0);
	}
	if (options.rest.length != 1) {
	print('Dart script file required.\n');
	printUsage();
	exit(1);
	}
	var debug = options['debug'] as bool \|\|
	options['observe'] as bool \|\|
	options.wasParsed('vm-service-port');
	var summarizeText = options['summarize-text'] as bool;
	var binary = options['binary'] as String;
	var experiments = options['enable-experiment'] as List;
	var summaries = options['summary'] as List;
	var port = int.parse(options['port'] as String);
	var mode = options['mode'] as String;
	var compile = mode == 'compile' \|\| mode == 'all';
	var run = mode == 'run' \|\| mode == 'all';
	var verbose = options['verbose'] as bool;
	var soundNullSafety = options['sound-null-safety'] as bool;
	var nonNullAsserts = options['null-assertions'] as bool;
	var nativeNonNullAsserts = options['null-assertions'] as bool;
	var weakNullSafetyErrors = options['weak-null-safety-errors'] as bool;
	var entry = p.canonicalize(options.rest.first);
	var out = (options['out'] as String) ?? p.setExtension(entry, '.js');
	var libRoot = p.dirname(entry);
	var basename = p.basenameWithoutExtension(entry);
	var libname =
	module_builder.pathToJSIdentifier(p.relative(p.withoutExtension(entry)));

	// By default (no `-d`), we use the `dartdevc` binary on the user's path to
	// compute the SDK we use for execution. I.e., we assume that `dart` is
	// under `$DART_SDK/bin/dart` and use that to find `dartdevc` and related
	// artifacts. In this mode, this script can run against any installed SDK.
	// If you want to run against a freshly built SDK, that must be first on
	// your path.
	var dartBinary = Platform.resolvedExecutable;
	var dartSdk = p.dirname(p.dirname(dartBinary));

	// In debug mode (`-d`), we run from the `pkg/dev_compiler` sources. We
	// determine the location via this actual script (i.e., `-d` assumes
	// this script remains under to `tool` sub-directory).
	var toolPath =
	Platform.script.normalizePath().toFilePath(windows: Platform.isWindows);
	var ddcPath = p.dirname(p.dirname(toolPath));
	var dartCheckoutPath = p.dirname(p.dirname(ddcPath));

	/// Runs the [command] with [args] in [environment].
	///
	/// Will echo the commands to the console before running them when running in
	/// `verbose` mode.
	Future<Process> startProcess(String name, String command, List<String> args,
	[Map<String, String> environment = const {}]) {
	if (verbose) {
	print('Running $name:\n$command ${args.join(' ')}\n');
	if (environment.isNotEmpty) {
	var environmentVariables =
	environment.entries.map((e) => '${e.key}: ${e.value}').join('\n');
	print('With Environment:\n$environmentVariables\n');
	}
	}
	return Process.start(command, args,
	mode: ProcessStartMode.inheritStdio, environment: environment);
	}

	Future<void> runDdc(String command, List<String> args) async {
	if (debug) {
	// Use unbuilt script. This only works from a source checkout.
	var vmServicePort = options.wasParsed('vm-service-port')
	? '=${options['vm-service-port']}'
	: '';
	var observe =
	options.wasParsed('vm-service-port') \|\| options['observe'] as bool;
	args.insertAll(0, [
	if (observe) ...[
	'--enable-vm-service$vmServicePort',
	'--pause-isolates-on-start',
	],
	'--enable-asserts',
	p.join(ddcPath, 'bin', '$command.dart')
	]);
	command = dartBinary;
	} else {
	// Use built snapshot.
	command = p.join(dartSdk, 'bin', command);
	}
	var process = await startProcess('DDC', command, args, <String, String>{
	if (options['compile-vm-options'] != null)
	'DART_VM_OPTIONS': options['compile-vm-options'] as String
	});
	if (await process.exitCode != 0) exit(await process.exitCode);
	}

	String mod;
	bool chrome = false;
	bool node = false;
	bool d8 = false;
	switch (options['runtime'] as String) {
	case 'node':
	node = true;
	mod = 'common';
	break;
	case 'd8':
	d8 = true;
	mod = 'legacy';
	break;
	case 'chrome':
	chrome = true;
	mod = 'amd';
	break;
	}

	var sdkRoot = p.dirname(p.dirname(ddcPath));
	var buildDir =
	p.join(sdkRoot, Platform.isMacOS ? 'xcodebuild' : 'out', 'ReleaseX64');
	var requirePath = p.join(sdkRoot, 'third_party', 'requirejs');
	var sdkOutlineDill = p.join(buildDir,
	soundNullSafety ? 'ddc_outline_sound.dill' : 'ddc_outline.dill');
	var suffix = soundNullSafety ? p.join('sound', mod) : p.join('kernel', mod);
	var sdkJsPath = p.join(buildDir, 'gen', 'utils', 'dartdevc', suffix);

	// Print an initial empty line to separate the invocation from the output.
	if (verbose) {
	print('');
	}

	if (compile) {
	var ddcArgs = [
	if (summarizeText) '--summarize-text',
	'--modules=$mod',
	'--dart-sdk-summary=$sdkOutlineDill',
	for (var summary in summaries) '--summary=$summary',
	for (var experiment in experiments) '--enable-experiment=$experiment',
	if (soundNullSafety) '--sound-null-safety',
	if (options['packages'] != null) '--packages=${options['packages']}',
	'-o',
	out,
	entry
	];
	await runDdc('dartdevc', ddcArgs);
	}

	if (run) {
	if (chrome) {
	String chromeBinary;
	if (binary != null) {
	chromeBinary = binary;
	} else if (Platform.isWindows) {
	chromeBinary =
	'C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe';
	} else if (Platform.isMacOS) {
	chromeBinary =
	'/Applications/Google Chrome.app/Contents/MacOS/Google Chrome';
	} else {
	// Assume Linux
	chromeBinary = 'google-chrome';
	}

	var html = '''
	<script src='$requirePath/require.js'></script>
	<script>
	require.config({
	paths: {
	'dart_sdk': '$sdkJsPath/dart_sdk',
	},
	waitSeconds: 15
	});
	require(['dart_sdk', '$basename'],
	function(sdk, app) {
	'use strict';

	sdk.dart.weakNullSafetyWarnings(
	!($weakNullSafetyErrors \|\| $soundNullSafety));
	sdk.dart.weakNullSafetyErrors($weakNullSafetyErrors);
	sdk.dart.nonNullAsserts($nonNullAsserts);
	sdk.dart.nativeNonNullAsserts($nativeNonNullAsserts);
	sdk._debugger.registerDevtoolsFormatter();
	app.$libname.main([]);
	});
	</script>
	''';
	var htmlFile = p.setExtension(out, '.html');
	File(htmlFile).writeAsStringSync(html);
	var tmp = p.join(Directory.systemTemp.path, 'ddc');

	var process = await startProcess('Chrome', chromeBinary, [
	'--auto-open-devtools-for-tabs',
	'--allow-file-access-from-files',
	'--remote-debugging-port=$port',
	'--user-data-dir=$tmp',
	htmlFile
	]);
	if (await process.exitCode != 0) exit(await process.exitCode);
	} else if (node) {
	var nodePath = '$sdkJsPath:$libRoot';
	var runjs = '''
	let source_maps;
	try {
	source_maps = require('source-map-support');
	source_maps.install();
	} catch(e) {
	}
	let sdk = require(\"dart_sdk\");
	// Create a self reference for JS interop tests that set fields on self.
	sdk.dart.global.self = sdk.dart.global;
	let main = require(\"./$basename\").$libname.main;
	try {
	sdk.dart.weakNullSafetyWarnings(
	!($weakNullSafetyErrors \|\| $soundNullSafety));
	sdk.dart.weakNullSafetyErrors($weakNullSafetyErrors);
	sdk.dart.nonNullAsserts($nonNullAsserts);
	sdk.dart.nativeNonNullAsserts($nativeNonNullAsserts);
	sdk._isolate_helper.startRootIsolate(main, []);
	} catch(e) {
	if (!source_maps) {
	console.log('For Dart source maps: npm install source-map-support');
	}
	sdk.core.print(sdk.dart.stackTrace(e));
	process.exit(1);
	}
	''';
	var nodeFile = p.setExtension(out, '.run.js');
	File(nodeFile).writeAsStringSync(runjs);
	var nodeBinary = binary ?? 'node';
	var process = await startProcess('Node', nodeBinary,
	['--inspect=localhost:$port', nodeFile], {'NODE_PATH': nodePath});
	if (await process.exitCode != 0) exit(await process.exitCode);
	} else if (d8) {
	// Fix SDK import. `d8` doesn't let us set paths, so we need a full path
	// to the SDK.

	var jsFile = File(out);
	var jsContents = jsFile.readAsStringSync();
	jsContents = jsContents.replaceFirst(
	"from 'dart_sdk.js'", "from '$sdkJsPath/dart_sdk.js'");
	jsFile.writeAsStringSync(jsContents);

	var runjs = '''
	load("$ddcPath/lib/js/legacy/dart_library.js");
	load("$sdkJsPath/dart_sdk.js");
	load("$out");

	let sdk = dart_library.import('dart_sdk');
	// Create a self reference for JS interop tests that set fields on self.
	sdk.dart.global.self = sdk.dart.global;
	sdk.dart.weakNullSafetyWarnings(
	!($weakNullSafetyErrors \|\| $soundNullSafety));
	sdk.dart.weakNullSafetyErrors($weakNullSafetyErrors);
	sdk.dart.nonNullAsserts($nonNullAsserts);
	sdk.dart.nativeNonNullAsserts($nativeNonNullAsserts);
	dart_library.start('$basename', '$libname');
	''';
	var d8File = p.setExtension(out, '.d8.js');
	File(d8File).writeAsStringSync(runjs);
	var d8Binary = binary ?? p.join(dartCheckoutPath, _d8executable);
	var process = await startProcess('D8', d8Binary, ['--module', d8File]);
	if (await process.exitCode != 0) exit(await process.exitCode);
	}
	}
	}

	String get _d8executable {
	if (Platform.isWindows) {
	return p.join('third_party', 'd8', 'windows', 'd8.exe');
	} else if (Platform.isLinux) {
	return p.join('third_party', 'd8', 'linux', 'd8');
	} else if (Platform.isMacOS) {
	return p.join('third_party', 'd8', 'macos', 'd8');
	}
	throw UnsupportedError('Unsupported platform.');
	}