Using Typescript for AngularJS bindings with ng.IComponentController

Currently, I am utilizing webpack alongside Babel and Typescript

Presently, the controller in question is as follows:

// HelloWorldController.ts

class HelloWorldController implements ng.IComponentController {

constructor(private $scope: ng.IScope) {
}

public over(): void {
    this.$scope.color = this.change();
}
}

Accompanied by its corresponding component options

export class HelloWorldComponent implements ng.IComponentOptions {

public bindings: {[binding: string]: string};
public controller: Function;
public templateUrl: string;

public constructor() {
    this.bindings = {
        color: '=',
        change: "&"
    };
    this.controller = HelloWorldController;
    this.templateUrl = "HelloWorld.html";
    }
}
app.component('helloWorld', new HelloWorldComponent());

Upon transpiling this code, an error emerged:

error TS2339: Property 'change' does not exist on type 'HelloWorldController'

I am curious about how to access the bindings reference within a controller using Typescript

Answer №1

Ensure that you define the bound variables on your Controller:

// HelloWorldController.ts
class HelloWorldController implements ng.IComponentController {

    change: () => any;
    color: any;

    public over(): void {
        this.color = this.change();
    }
}

By doing this, you are informing TypeScript about the presence of these properties on your controller.

Keep in mind that when initializing your component controller, Angular will implement the bindings specified in your component options (color: '=', change: "&") and assign the values of your controller's variables accordingly. Consequently, there is no longer a need to access these bindings through $scope (as demonstrated in the over method), eliminating the necessity of injecting $scope into your controller and significantly augmenting the reusability of your code.

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