Creating separate files for interface declarations

Question

Creating separate files for interface declarations

Consider a scenario where there is a file named user.ts containing the following declaration:

export interface User {
  userName: string;
}

The task at hand is to import this particular interface from another TypeScript script. However, due to JavaScript's lack of support for interfaces, the transpiler fails to generate the user.js file and an error occurs during the import process.

One potential solution would involve declaring User as a class, but is there a method to define an interface in a separate TypeScript file?

typescript

Answer 1

Answer №1

If you want to define the user file with the extension .d.ts, here is an example:

user.d.ts

export interface User {
    name: string
}

You can then import it in your code like this:

someotherfile.ts

import {User} from './user';
    
function validateUser(user: User) {
    if (user.name) {
        console.log('It works!');
    }
}

validateUser({ name: 'John' });

Answer 2

If you want to define the user file with the extension .d.ts, here is an example:

user.d.ts

export interface User {
    name: string
}

You can then import it in your code like this:

someotherfile.ts

import {User} from './user';
    
function validateUser(user: User) {
    if (user.name) {
        console.log('It works!');
    }
}

validateUser({ name: 'John' });

Creating separate files for interface declarations

Answer №1

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