When attempting to access a static method in TypeScript, an error occurs indicating that the property 'users_index' does not exist on the type 'typeof UserApiController'

Just dipping my toes into TypeScript and attempting to invoke a function on a class.

In file A:

import userAPIController from "./controllers/customer/userAPIController";

userAPIController.users_index();

In file B:

export default class UserApiController {

    public users_index(): void {
        User.findAll({
            attributes: ["given_name", "family_name"]
        }).success(function (users: any) {
            console.log(users);
        });
}

An error crops up saying:

Property 'users_index' does not exist on type 'typeof UserApiController'

I even attempted to introduce an interface:

interface userAPIController {
    users_index: any;
}

No dice, though.

What am I messing up here?

Answer №1

TheUsersController is a type of class that needs to be initialized before you can access its functions:

let controller = new TheUsersController();
controller.showAllUsers();

To learn more about working with classes, check out this link: https://www.typescriptlang.org/docs/handbook/classes.html

Answer №2

Your current function is an instance method, not a static method. If you want it to be static, simply modify it as follows:

static users_index = (): void => {
 // content omitted
}

If you need more information on static properties, check out this page

However, if your function should remain an instance method, make sure to create an instance using the new operator before accessing it:

const controller = new UserApiController();
controller.users_index();

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