Parcel 2 generates wrong declaration file when declare global is used

[jakubmazanec]

declare global in TypeScript file makes Parcel generate wrong declaration file:

// src/index.ts
declare global {}

class Foo {
}

export const foo = new Foo();

// dist src/index.d.ts
// no foos? 😭

🎛 Configuration

Simple setup with config only via package.json

{
  "name": "parcel-bug-declare-global",
  "version": "1.0.0",
  "main": "dist/index.js",
  "source": "src/index.ts",
  "types": "dist/index.d.ts",
  "scripts": {
    "build": "parcel build"
  },
  "devDependencies": {
    "@parcel/packager-ts": "^2.0.1",
    "@parcel/transformer-typescript-types": "^2.0.1",
    "parcel": "^2.0.1",
    "typescript": "4.4.4"
  }
}

🤔 Expected Behavior

After running npm install and npm build, file dist/index.d.ts should look maybe something like this?

declare global { }
declare class Foo {
}
export const foo: Foo;

😯 Current Behavior

Ouput definition file is completely empty.

💻 Code Sample

Sample repo

[Shinyaigeek]

This issue seems to be fixed in #7315 👀 current v2 branch correctly works.

[mischnic]

Indeed, it also works fine with the nightly versions.