import types

Modules can import types declared in other modules. But non-module global scripts cannot access types declared in modules. Enter import types.

Using import("mod") in a type annotation allows for reaching in a module and accessing its exported declaration without importing it.

Example

Given a declaration of a class Pet in a module file:

// module.d.ts
export declare class Pet {
   name: string;
}

Can be used in a non-module file global-script.ts:

// global-script.ts
function adopt(p: import("./module").Pet) {
    console.log(`Adopting ${p.name}...`);
}

This also works in JSDoc comments to refer to types from other modules in .js:

// a.js
/**
 * @param p { import("./module").Pet }
 */
function walk(p) {
    console.log(`Walking ${p.name}...`);
}