Importing types with checked JS

[azz]

TypeScript Version: 2.5.3

Code

In TypeScript, it is trivial to import a type from a package:

import { MyType } from "types-package";

function foo(bar: MyType) {}

However, with checked JS, as far as I can tell there's no way to achieve this. The following loosely demonstrates what I'm after.

/**
 * @typedef {import { MyType } from "types-package"} {MyType}
 * @param {MyType} bar
 */
function foo(bar) {}

Note that:

1. types-package is a .d.ts only package, no runtime code.
2. The specific use case I am working with is a module that implements an interface on the exported functions. Consider a VSCode extension, which exports an activate function, it is currently not possible to type the context parameter to that function if the extension is written in JS.

[azz]

I've found a workaround. If your types package has an index.js with the contents:

module.exports = {};

Then you can import the types as usual and it works...

[mhegazy]

Duplicate of #14377

[azz]

Ah, thanks. Happy to close as a duplicate.

[azz]

The solution mentioned here would be perfect: #14377 (comment)