Import types without the typescript compiler considering it a module (web workers)

I have a web worker file that shares types with the rest of the typescript application. The web worker file is written in typescript as well.

types.d.ts

export type someType = string | number

search.worker.ts

import type { someType } from 'types.d.ts'

// Web worker logic

app.ts

import type { someType } from 'types.d.ts'

// App logic

I created a separate tsconfig that selectively includes only *.worker.ts and *.d.ts files. I also excluded worker.ts from the main application tsconfig.

The issue is that when I run the worker tsconfig, it emits everything correctly except it treats it as a module. Now inside at the bottom of the transpiled worker.js file there is a export {};.

The issue is that spawning a web worker as a module is not globally supported, and it throws an error if it's there. So exports {}; needs to be removed. I'm not sure how I can accomplish this, or if I need to use other post-bundling tools to get rid of this line.

I suspect that I'm basically telling typescript that it's a module by using that import type { ... line. But I don't really know how to import types otherwise.

Here is my config for tsconfig for the workers:

{
    "compilerOptions": {
        "outDir": "./assets/workers",
        "rootDir": "./src",
        "skipLibCheck": true,
        "target": "ES2020"
    },
    "include": [
        "./src/**/*.worker.ts",
        "./src/**/*.d.ts"
    ],
}

Thank you!