Import behavior mismatch from typescript 5 (bwip-js)

[ryanrasti]

I'm getting an issue where tsgo doesn't recognize an import that is working with normal tsc.

relevant versions:

{
  "dependencies": {
    "@typescript/native-preview": "^7.0.0-dev.20250529.1",
    "bwip-js": "^4.5.1",
    "typescript": "^5.8.3"
  }
}

To reproduce:

git clone https://github.com/ryanrasti/tsgo-import-mismatch-repro
cd tsgo-import-mismatch-repro
npm i

./node_modules/.bin/tsc # works fine

./node_modules/.bin/tsgo # get error "main.ts:1:23 - error TS2307: Cannot find module 'bwip-js' or its corresponding type declarations."

[joshcartme]

I don't understand what's causing the issue, but if you add "include": ["node_modules"] to your tsconfig it'll work under tsgo

[anilanar]

Related: #982

[ryanrasti]

Related: #982

Nice that seems to work for this example, but it has some side-effects -- e.g., now I run into an issue where I can't include graphql because node_modules/graphql/NotSupportedTSVersion.d.ts gets imported (underlying issue is that it seems that for a package.json in node_modules, typesVersions is no longer respected)

[jakebailey]

Can you please file a new issue for your separate issue?

[ryanrasti]

Can you please file a new issue for your separate issue?

I didn't test if that is truly a separate issue (i.e., a mismatch between tsc and tsgo) -- I was just commenting that the proposed workaround has side-effects that make it not workable for me.

[jakebailey]

Sorry, did not notice that you were the original issue filer. Adding that kind of include is definitely not an intended fix.

The problem here is that you have "moduleResolution": "Node" set, which implies module=commonjs, which then all together breaks things. This setup isn't supported by tsgo (and is not recommended in general).

If you instead change to nodenext resolution, your code compiles correctly.

[jakebailey]

See also: https://www.typescriptlang.org/docs/handbook/modules/guides/choosing-compiler-options.html