Add support for tsconfig.json files with `extends` property

[cmolina]

Hello, thanks for maintaining this project!

I am trying to run tsc-files twice as part of a pre-commit hook, once for my app files and then for my test ones.

The app works fine, since there is a tsconfig.json at the root of my project.

However I haven't been able to run tsc-files for my test files, where I have another tsconfig file with this content:

// test/tsconfig.json
{
  "extends": "../tsconfig.json"
}

when I run tsc-files -p -test/tsconfig.json from <parent-directory>/my-repo/ I get:

error TS5083: Cannot read file '<parent-directory>/tsconfig.json'.
# notice how "my-repo/" is not in the path!

If I go into the test directory and run tsc-files, I get:

error TS6053: File '<parent-directory>/my-repo/<path-to-file>' not found.
# and <path-to-file> doesn't start with "test/"

Am I missing something?

If this is not supported yet, are you interested in receiving PRs for adding this functionality?

[tal-rofe]

@cmolina

Actually I can see the index.js file would append "extends" as well to the temporary tsconfig file. As far as I know he is interested in PRs.

[jjcfatras]

Has there been any updates on this? I'm trying to add this to a monorepo but I'm having issues where path aliases defined in a child package's tsconfig.json file are being ignored.

[gustavopch]

@jjcfatras No updates on this. Unfortunately, I'm not finding any time to dedicate to this project. But the whole thing is about 50 lines of code, so I recommend copying the code and adjusting to your needs.

[cmolina]

I am going to go a little off-topic here, but maybe I can save some time to the future reader.

I was very eager to add support for extends; but then I realized that this project is not doing what I was expecting. I was hoping to determine if my current changes would break my app. But it is not enough to compile the edited files; you still need to run tsc over all the other files that depends on the edited files. You can read more about it in #6.

I am not sure if TypeScript has an API for this (i.e. get a list of all the files that are affected by a single update). Until then, if your purpose here is to make sure your change didn't break your app/library, you will probably need to run tsc anyway.

---

Having said that, if you are okay with this limitation and you still need support for extends, it should be pretty straightforward to add.

[gustavopch]

Agreed, I'm just using plain tsc these days myself. One can also use --incremental flag if it's slow.