Support for import path rewriting

I use paths in tsconfig.json and tsc doesn’t transform import paths automatically.

Basically, just need a way to intercept import statements (using the programmatic API) so I can change where they are pointing.

Alternatively, this package could respect paths in tsconfig.json and do the mapping for me, which could be opt-in if that’s a concern.

[timocov]

@igorpupkinable Sorry for late reply here.

Remove paths from packages/fe-components/tsconfig.json

The reason why this step makes the tool is working is that there are 2 “levels” of linking packages:

• fs symlinks, which are generated by yarn monorepo I guess
• TS paths, compiler-only “links”

It looks like they are applying in opposite order, i.e. paths are first, then fs symlinks. By removing paths you let compiler to use fs symlinks and that’s why it is working.

The original issue is the tool relies on fs path rather that import query (which obviously might be different across the project).

Relying on paths is kind of tricky, because if you’re using paths it doesn’t mean that this folder (or a file) should be treated as an “external”. You could add one of your folders to the paths just to decrease level of exiting while writing a path in import statement ('../../../../../../../file' vs '~root/file').

Moreover, I’m not sure, but most likely ts compiler resolves a module’s name internally before accessing FS api (you said that enabling disable-symlinks-following doesn’t work, but all this flag does is preventing accessing FS to resolve a module path). Probably it should be handled in resolveModuleNames to replace the file path with its request instead (but it might be tricky since it should be a path and ts could rely on it internally).

Let me know if you’ll have any thoughts on it.

[igorpupkinable]

Just faced this issue in my monorepo. Having "paths": { "@xxx/ui-core": ["../ui-core/src"], } entry in tsconfig.json treats @xxx/ui-core as internal package thereby inlining its types even if importedLibraries: ['@xxx/ui-core'] is set.

DTS is bundled properly if I remove "paths": { "@xxx/ui-core": ["../ui-core/src"], } from tsconfig.json. Unfortunately --disable-symlinks-following does not help with TS paths.

Does anyone have a solution for this issue?

Reproducible example: https://github.com/igorpupkinable/dts-bundle-generator-issues-50 Steps to reproduce:

1. yarn install
2. yarn check:types
3. cd packages/ui-core
4. yarn build:types
5. cd …/fe-components
6. yarn build:types <= Error: lib/index.d.ts(10,35): error TS2304: Cannot find name 'ThisShouldNotBeInlined'.
7. Remove paths from packages/fe-components/tsconfig.json
8. yarn build:types <= Success. ThisShouldNotBeInlined is imported as expected.

@timocov please let me know if I can provide more information or where to start investigation.