Is it possible to use ES5 JavaScript with Angular 2 instead of TypeScript?

Question

Is it needed to learn TypeScript for Angular 2?

Can Angular 2 be used with plain JavaScript ?

Edit: I\'ve seen that the languages used as ES6, ES7, Dart comp

Answer 1

Yes.

Here are 2 simple components, written in different ways that Angular 2 supports when writing in JavaScript (EcmaScript 5):

(function() {

  var HelloWorldComponent = function() {};

  HelloWorldComponent.annotations = [
    new ng.core.Component({
      selector: 'hello-world',
      template: '
Hello Angular2!
'
    })
  ];

  var HelloFlentApi = ng.core.Component({
    selector: 'hello-fluent',
    template: '
Hello {{name}}!
' + '',
  }).Class({
    constructor: function() {
      this.name = "Fluent API";
    }
  });

  var AppComponent = ng.core.Component({
    selector: 'company-app',
    template: '' +
      '',
    directives: [HelloWorldComponent, HelloFlentApi]
  }).Class({
    constructor: function() {}
  });

  document.addEventListener("DOMContentLoaded", function() {
    ng.platform.browser.bootstrap(AppComponent);
  });

}());

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I wrote a detailed explanation of the code here:

Writing An Angular2 Component in Today’s JavaScript (ES5) – Beta 0 Edition

As the link says, this applies to Angular 2 Beta 0, which was released a few hours ago at the time of writing this answer.