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// Copyright (c) 2013, 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 = 2.7
// Test of the graph segmentation algorithm used by deferred loading
// to determine which elements can be deferred and which libraries
// much be included in the initial download (loaded eagerly).
import 'package:async_helper/async_helper.dart';
import 'package:compiler/src/compiler.dart';
import 'package:expect/expect.dart';
import '../helpers/memory_compiler.dart';
void main() {
asyncTest(() async {
print('--test from kernel------------------------------------------------');
await runTest();
runTest() async {
CompilationResult result =
await runCompiler(memorySourceFiles: MEMORY_SOURCE_FILES);
Compiler compiler = result.compiler;
var closedWorld = compiler.backendClosedWorldForTesting;
var outputUnitForMember = closedWorld.outputUnitData.outputUnitForMember;
var outputUnitForClass = closedWorld.outputUnitData.outputUnitForClass;
var mainOutputUnit = closedWorld.outputUnitData.mainOutputUnit;
var elementEnvironment = closedWorld.elementEnvironment;
dynamic lib = elementEnvironment.lookupLibrary(Uri.parse("memory:lib.dart"));
var customType = elementEnvironment.lookupClass(lib, "CustomType");
var foo = elementEnvironment.lookupLibraryMember(lib, "foo");
Expect.notEquals(mainOutputUnit, outputUnitForMember(foo));
// Native elements are not deferred
Expect.equals(mainOutputUnit, outputUnitForClass(customType));
// The main library imports a file defining a custom element.
// Registering this class implicitly causes the constructors to be
// live. Check that this is handled.
const Map<String, String> MEMORY_SOURCE_FILES = const {
"main.dart": """
import "lib.dart" deferred as a;
import 'dart:html';
main() {
document.registerElement("foo-tag", a.a);;
"lib.dart": """
import 'dart:html';
var a = CustomType;
class CustomType extends HtmlElement {
factory CustomType() => null;
CustomType.created() : super.created() ;
foo() {}