How can TypeScript be effectively utilized with global packages?

Question

How can TypeScript be effectively utilized with global packages?

Utilizing the global package to incorporate certain enzyme methods in test files without the need for importing:

import { configure, shallow, render, mount } from 'enzyme';
   .....
global.shallow = shallow;
global.render = render;
global.mount = mount;

This allows me to use:

const component = shallow(<Input {...props} />);

within my test file without explicitly importing the shallow method

Unfortunately, typescript is not aware of these global variables, resulting in the following error message: [ts] Cannot find name 'shallow'.

How can I inform typescript about these global variables?

typescript global enzyme

Answer 1

Answer №1

Using the declare keyword is how you specify types in TypeScript. To implement this in your test file, simply add the line below at the beginning:

declare const shallow:any; // You may provide more specific type information if needed

;

Alternatively, instead of using declare, you can typecast the window object in the following ways:

const component = (window as any).shallow(<Input {...props} />);

or like this:

const component = (<any> window).shallow(<Input {...props} />);

It is important to note that exposing functions as global objects is generally not recommended. This practice can lead to conflicts, especially if you have multiple functions with the same name, as one will overwrite the other.

Answer 2

Using the declare keyword is how you specify types in TypeScript. To implement this in your test file, simply add the line below at the beginning:

declare const shallow:any; // You may provide more specific type information if needed

;

Alternatively, instead of using declare, you can typecast the window object in the following ways:

const component = (window as any).shallow(<Input {...props} />);

or like this:

const component = (<any> window).shallow(<Input {...props} />);

It is important to note that exposing functions as global objects is generally not recommended. This practice can lead to conflicts, especially if you have multiple functions with the same name, as one will overwrite the other.

How can TypeScript be effectively utilized with global packages?

Answer №1

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