Creating an interface for a class instance through the implementation of a class constructor

Question

Creating an interface for a class instance through the implementation of a class constructor

I am working on an application where developers can specify which component they want to render a certain part. I need users to understand that they must implement an interface, but I'm struggling with correctly writing the typing.

export interface ICustomComponent {
    templateObject: any;
}

export class MyComponent implements ICustomComponent {
}

export class MyLib {
    constructor(
        private yourComponent: ICustomComponent
    ) {}
}

new MyLib(MyComponent); <== Fails

Currently, I am coding in Angular and unable to use the new operator, instead relying on Angular to resolve and construct the component.

Here is an example that showcases the issue I am facing.

Does anyone have suggestions on how to solve this problem?

angular typescript prototype

Answer 1

Answer №1

To ensure compatibility with MyLib, which requires a class constructor rather than a class instance, you must create an interface for the class constructor and specify that it returns an instance implementing the ICustomComponent interface:

interface ICustomComponent {
  templateObject: any;
}

interface ICustomComponentConstructor {
  new (...deps: any[]): ICustomComponent;
}

This allows you to implement it in the following way:

export class MyComponent implements ICustomComponent {
  templateObject: any;
}

export class MyLib {
  constructor(private yourComponent: ICustomComponentConstructor) {
  }
}

new MyLib(MyComponent);

For further information on creating interfaces for class constructors and instances, refer to this resource.

Answer 2

To ensure compatibility with MyLib, which requires a class constructor rather than a class instance, you must create an interface for the class constructor and specify that it returns an instance implementing the ICustomComponent interface:

interface ICustomComponent {
  templateObject: any;
}

interface ICustomComponentConstructor {
  new (...deps: any[]): ICustomComponent;
}

This allows you to implement it in the following way:

export class MyComponent implements ICustomComponent {
  templateObject: any;
}

export class MyLib {
  constructor(private yourComponent: ICustomComponentConstructor) {
  }
}

new MyLib(MyComponent);

For further information on creating interfaces for class constructors and instances, refer to this resource.

Creating an interface for a class instance through the implementation of a class constructor

Answer №1

Similar questions

Angular 2: Changing the name of a component

Webpack and incorporating bespoke scripts

I am looking to update my table once I have closed the modal in Angular

"Discovering the secrets of incorporating a spinner into Angular2 and mastering the art of concealing spinners in Angular

Ways to retrieve the value of the variable within the confines of this particular

Testing Vue components with Typescript and Jest does not display the expected values in the HTML output

developing a collection of Material UI text fields

Can a type be established that references a type parameter from a different line?

Using Angular to access HTML content through the .ts file

Calculating the Angular Sum of Multiple Input Fields

Angular is unable to bind with 'dragula' because it does not recognize it as a valid property of 'ul'

Issues arise when trying to update the modelValue in unit tests for Vue3 Composition API

ESLint encountered an issue while attempting to load the configuration "plugin:@angular-eslint/ng-cli-compat" for extension

The error message TS2339 in Angular service.component indicates that the property 'subscribe' is not recognized on the type 'Promise<Object>'

Using `npm audit --force` is advised only for those with expertise. If you are unsure, what steps should you take? Could my application be vulnerable while

access denied on image links

Adjust the color of the entire modal

Issue with rendering the search component due to a conflict with validate.js

What is the best way to protect an Angular/Spring application using Keycloak?

How can I apply concatMap in Angular?