Why is --isolatedModules error fixed by any import?

Question

In a create-react-app typescript project, I tried to write this just to test some stuff quickly:

// experiment.test.ts         


        

Answer 1

The correct way is to tell TypeScript what you want. If you don't want isolatedModules create tsconfig.json inside your test directory and add:

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "isolatedModules": false
  },
}

Adding "isolatedModules": true to the config and then cheating TypeScript checker by adding empty export {} smells bad code to me.