What is the method for specifying the type of Component in Angular?

Is it possible to specify the type of Component within a mock function?

@Component({
   templateUrl: 'a'
})
export class MyApp {
}
function testFunction(component: any) {
     ....
}       
testFunction(MyApp);

Answer №1

Your question contains a few areas that could benefit from further explanation.

For instance, in the example provided, export class MyApp {...} is defining a class named MyApp.

Typically, when passing a class to a function, you would pass an instance of that class. Here is how it would look:

function dummy(component: MyApp) {
     ....
}       
dummy(new MyApp());

If your intention is to pass the class type itself to the function, the approach would be slightly different:

import {
  Type
} from '@angular/core';

function dummy(component: Type<any>) {
     ....
}       
dummy(MyApp);

To enhance the functionality further, you can limit the types of components that can be passed by specifying that they must adhere to a specific interface. Here’s an example:

import {
  Type
} from '@angular/core';

export interface IFoo {
   id: number;
   getStuff: () => string;
}
@Component({
   templateUrl: 'a'
})
export class MyApp implements IFoo {
}
function dummy(component: Type<IFoo>) {
     const stuff = component.getStuff();
     ....
}
dummy(MyApp);

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