Missing subfolder path completions with wildcard `typesVersions`

[kim3er]

Bug Report

Sub folders of a folder listed in typeVersions, do not resolve in VS Code's autocomplete. I originally believed the issue to be related to Support for NodeJS 12.7+ package exports.

🔎 Search Terms

typeVersions
autocomplete

🕗 Version & Regression Information

This is using Visual Studio Code 1.64.2 and TypeScript 4.5.5. I believe this bug to not be a revision, and is not resolved in TypeScript 4.7.0.

⏯ Playground Link

Code required relationship between two projects, so used Github instead.

Github repo

💻 Code

We have an internal package, written in TS, transpiled to a sub folder called 'dest'. The package.json of the package looks like:

{
  ...
  "type": "module",
  "exports": {
    "./*": "./dest/*"
  },
  "typesVersions": {
    "*": {
      "*": [
        "dest/*"
      ]
    }
  },
  ...
}

We're able to consume the package in our projects, like this:

import { something } from 'test-package/something'; // Actual file './dest/something.js'

This works. Our code is transpiled correctly. We get autocomplete on the import path, and typing on the imported whatever, within VS Code.

Until, we attempt to access a sub folder within the 'dest' folder. Within a subfolder, like:

import { somethingElse } from 'test-package/sub-folder/something-else'; // Actual file './js/sub-folder/something-else.js'

In this instance, we get everything from above, except autocomplete on the import path. The file still resolves, and we get typing. Our build script still runs, the files is just invisible.

This is using Visual Studio Code 1.64.2 and TypeScript 4.5.5. Both project and package have the following tsconfig.json:

{
  ...
    "target": "ES2016",
    "module": "ESNext",
  ...
}

🙁 Actual behavior

Autocomplete does not resolve the scripts with the sub folder.

🙂 Expected behavior

Autocomplete should resolve the scripts within a sub folder.

[jasonwilliams]

I was about to raise this too. I was following https://2ality.com/2021/07/simple-monorepos.html#a-better-solution%3A-npm-workspaces-and-typescript-project-references

I needed to have paths in a library instead of just one default export.

@andrewbranch I know you worked on this feature, is this a bug? It looks like the resolution works but just not on auto complete? Long term we would use TypeScript's ESM support when that's released, but in the meantime we need to use typeVersions.

Here is another example:

autocomplete.mp4

Here is a test case repository (shown in the video).
https://github.com/jasonwilliams/subpath-testcase

[kim3er]

Hey @jasonwilliams, that blog was also my starting point! 😁

[andrewbranch]

@jasonwilliams your case is a separate issue. Does it work after there is already one import of projecta elsewhere in projectb? If not, that’s another separate issue.

[jasonwilliams]

@jasonwilliams your case is a separate issue. Does it work after there is already one import of projecta elsewhere in projectb? If not, that’s another separate issue.

no it doesn't. And in the video you can see I have the top line, the second line still doesn't work.
But even if i import from another file in project B, it still won't auto complete elsewhere

[andrewbranch]

Answering my own question, that does work.

[andrewbranch]

Since typesVersions and exports are structured quite similarly, fixing @jasonwilliams’ issue would probably be a pretty straightforward parallel addition to the changes added here: https://github.com/microsoft/TypeScript/pull/47092/files#diff-fad6af6557c1406192e30af30e0113a5eb327d60f9e2588bdce6667d619ebd04

[jasonwilliams]

Hey @andrewbranch could you explain how both of our casing are different when we’re working from the same tutorial. It seems the issue is typeversions and using a wildcard which seems to be what we’re both doing.

[andrewbranch]

The way auto imports work and path completions work are just super different. Two different language features with completely different code paths.

[jasonwilliams]

I've just tested this again with the 4.7.0-dev.20220322 version and it still doesn't work. (auto complete doesn't work but the module is definitely there).

I have set VSCode to use the workspace version and it made no difference. Is this expected @andrewbranch ?

If i understand #47836 (comment) correctly we no longer need the "typeversions" hack as the completions are now coming from the exports mapping. Although that didn't make much different.

UPDATE

I've removed the asterisks in the pattern in exports (prev "./submodule/*" now "./submodule") and now the subpath auto completes. But the initial import doesn't autocomplete inside the import { | } block.

I can trigger auto complete here:
import { thing } from 'project/|' but ive already typed out most of it by this point

UPDATE 2

I've just switched from Node12 to NodeNext and its now working as expected. (not sure the difference between the 2).

[TheMrZZ]

Using Typescript 3.7 beta, I get the exact same issue with the exports field. I didn't find another issue specifically for this, is there already one?