TypeScript How to use a javascript library without a type definition file Make a module that exports a default any
Example
For more complicated projects, or in cases where you intend to gradually type a dependency, it may be cleaner to create a module.
Using JQuery (although it does have typings available) as an example:
// place in jquery.d.ts
declare let $: any;
export default $;
And then in any file in your project, you can import this definition with:
// some other .ts file
import $ from "jquery";
After this import, $ will be typed as any.
If the library has multiple top-level variables, export and import by name instead:
// place in jquery.d.ts
declare module "jquery" {
let $: any;
let jQuery: any;
export { $ };
export { jQuery };
}
You can then import and use both names:
// some other .ts file
import {$, jQuery} from "jquery";
$.doThing();
jQuery.doOtherThing();
