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Angular 2 Offline Compiler
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Shuhei Kagawa
May 20, 2016
Programming
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5.4k
Angular 2 Offline Compiler
ng-sake #3
http://ng-sake.connpass.com/event/30746/
Shuhei Kagawa
May 20, 2016
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Transcript
Angular 2 Offline Compiler @shuheikagawa
→ GitHub/Qiita @shuhei → Twitter @shuheikagawa → Software Engineer @
M3, Inc
Angular 2 & Me TypeScript-ish type annotations and decorators in
ES2015+ → babel-angular2-app → babel-preset-angular2 → babel-plugin-angular2-annotations
Compiler in JavaScript?
Template -> JS
Angular 1 Runtime compilation was the bottleneck
Angular 2 Compiles only once at the boot time
Can we do better?
Offline Compiler → Faster bootstrap → Smaller lib
Let's try!
$ npm i -D @angular/compiler-cli $ ./node_modules/.bin/ngc -p tsconfig.json
$ ls -l src app.css app.css.shim.ts app.ngfactory.ts app.ts main.ts
main.ts
import { coreBootstrap, ReflectiveInjector } from '@angular/core'; import { browserPlatform,
BROWSER_APP_STATIC_PROVIDERS } from '@angular/platform-browser'; import {AppNgFactory} from './app.ngfactory'; const appInjector = ReflectiveInjector.resolveAndCreate( BROWSER_APP_STATIC_PROVIDERS, browserPlatform().injector ); coreBootstrap(appInjector, AppNgFactory);
./node_modules/.bin/tsc -p tsconfig.json
Doesn't Work
→ o compiler_cli/integrationtest → x angular2-seed → x router-deprecated →
x router
None
What's .ngfactory.ts?
app.ts @Component({ selector: 'app', template: 'hello {{name}}' }) class App
{ name: string = 'ng2'; }
app.ngfactory.ts class _View_App0 extends DebugAppView<any> { createInternal() {} detectsChangeInternal() {}
} function viewFactory_App0(...): AppView<any> {} class _View_App_Host0 extends DebugAppView<any> { createInternal() {} } function viewFactory_App_Host0(...): AppView<any> {} export const AppNgFactory: ComponentFactory<App> = new ComponentFactory<App>('app', viewFactory_App_Host0, App);
createInternal
createInternal(rootSelector: string): AppElement { var parentRenderNode =this.renderer .createViewRoot(this.declarationAppElement.nativeElement); this._text_0 =
this.renderer .createText(parentRenderNode,'',this.debug(0,0,0)); this._expr_0 = import3.uninitialized; this.init([],[this._text_0],[],[]); return null; }
createInternal → create elements, texts and directives → set up
listeners → set up subscriptions → call child views
detectChangesInternal
detectChangesInternal(throwOnChange: boolean): void { this.detectContentChildrenChanges(throwOnChange); this.debug(0,0,0); var currVal_0: any =
import4.interpolate(1,'Hello World ',this.context.user,''); if (import4.checkBinding(throwOnChange,this._expr_0,currVal_0)) { this.renderer.setText(this._text_0,currVal_0); this._expr_0 = currVal_0; } this.detectViewChildrenChanges(throwOnChange); }
detectChangesInternal → detect changes → update DOMs → call child
views
Benefits → Shorter bootstrap time → JS size: compiler and
platform-browser-dynamic vs *.ngfactory.ts → Type-check your templates!
Notes → Don't check in generated files → TypeScript 1.8:
generate in src → TypeScript 1.9: use rootDirs → Expect a build system plugin instead of the CLI
Stay tuned!
fin