Angular
AoT Compilation

@laco0416

2016 Dec. 9 ng-japan Meetup

about me

  • TOPGATE, Inc.
  • Angular 2 Contributor
  • ng-japan Organizer

AngularConnect 2016

AngularConnect 2016

AngularConnect 2016

Yay!

angular-l10n

ME

The History

First Day

AngularConnect 2015

Build step compilation?

ng-conf 2016

Offline...?

And now...

AngularConnect 2016

AngularConnect 2016

Offline
Compilation

What is AoT...

What's AoT Compilation?

Ahead of  Time?

Time

Ahead of Time

Wikipedia

...Ahead-of-time (AOT) compilation 
is the act of
compiling 
a high-level programming language ...
into a native (system-dependent) machine code ...

Compilation

Source

???

Application

@Component({
  template: '<h1>Hello {{name}}</h1>'
})
class HelloComponent {
  name: string;
}
class HelloComponentFactory extends ComponentFactory<HelloComponent> {
  context: HelloComponent;
  createInternal() {
    this.el_0 = this.renderer.createElement(parentNode, 'hi', null);
  }
  detectChangesInternal() {
   this.renderer.setText(this.el_0, 'Hello ' + this.context.name, '');
  }
}

Compile (Code Generation)

Panic?

You've known compilation
maybe

React JSX

class HelloMessage extends React.Component {
  render() {
    return <div>Hello {this.props.name}</div>;
  }
}
ReactDOM.render(<HelloMessage name="John" />, mountNode);
class HelloMessage extends React.Component {
  render() {
    return React.createElement(
      "div", null, "Hello ", this.props.name
    );
  }
}
ReactDOM.render(React.createElement(
  HelloMessage, { name: "John" }), mountNode);

Compile

Compilation is NOT an Angular way 

@Component()

renderer.createElement

JSX

React.createElement

AngularConnect 2016

AngularConnect 2016

For templates

AngularConnect 2016

For templates

AngularConnect 2016

JiT compiled

AngularConnect 2016

AoT compiled

No Compiler

AngularConnect 2016

Error Detection

Rob

<router-outlet [foo]="bar">

AngularConnect 2016

Compilation FTW

  • Template: Easy to write/read 

  • Faster rendering
  • Less code to ship

  • Template error detection

How to AoT compile?

Conclusion

  • Ahead-of-Time == Offline == Build step

  • Compilation is NOT an Angular way

  • AoT compilation is NOT magic

  • Let's try Angular-CLI with --aot

Thanks!

Angular AoT Compilation

By Suguru Inatomi

Angular AoT Compilation

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