Motivation
I'd like to highlight my code relating Angular. Angular uses @Decorators often like below:

@Component({
  selector: 'my-app',
  template: `<div>Hello World!</div>`
})
export class AppComponent {}

A decorator is technically a function, but I want to separate its color from normal functions.

Currently, decorators are tokenized as function in language-typescript

Description

Adding .meta-like class to decorator name token.