Extending typescript interfaces

Question

I have component Checkbox.tsx, which ts interface looks like:

export interface ICheckbox {
    /** DOM element id. */
    id: string;
    /** Handler to the onClick event */
    onCheck?: (e: React.ChangeEvent<HTMLInputElement>) => void;
}

Now, I would like to create another component CheckboxWithLabel.tsx, which will have a very similar interface, the only additional thing gonna be a label. How can I merge two interfaces or extends existing interface? Something like:

import {ICheckbox} from './Checkbox.tsx';

export interface ICheckboxLabel {
    ...ICheckbox,
    label: string;
}

What i have tried is:

export interface ICheckboxLabel extends ICheckbox{
     children: JSX.Element | JSX.Element[] | string;
}

The problem is, that I don't know if it's the correct approach.

Ammar Hussain · Accepted Answer · 2018-12-03 12:09:33Z

3

You can export an interface by using extends keyword.

interface a extends b {
   ...
}

In your example it will be like.

export interface ICheckboxLabel extends ICheckbox {
   label: string
}

Also visit the official documentation for more information https://www.typescriptlang.org/docs/handbook/interfaces.html

edited Dec 3, 2018 at 12:09

answered Dec 3, 2018 at 12:01

Ammar Hussain

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2 Comments

Titian Cernicova-Dragomir Over a year ago

You should add a bit of text to the answer.. not just a code snippet ..

Nerijus Pamedytis Over a year ago

I think it's pretty self explanatory

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