nextjs-tree-shake-fail

Minimal example of tree-shaking not working as expected in a NextJS app when multiple routes import different things from the same file.

Repro steps:

1. Install dependencies with npm install

2. Run npm run build to generate the production output

3. Text-search for "string1" and "string2" in the static output folder js files (.next/static)

4. See that both strings show up in the js bundles for the /test and /test2 routes (.next/static/pages/test-[hash].js, .next/static/pages/test2-[hash].js)

   Expected behavior: Since /test only uses STRING1 and /test2 only uses STRING2, each respective route's bundled js should only include the relevant getString function.

   Note that STRING3, which is also defined in the same file, is correctly omitted from all routes' bundles.