Experiment: auto-import from yet-unimported referenced projects

[andrewbranch]

Still to-do:

• Deduplicate files from multiple programs
  • How does this change based on useSourceOfProjectReferenceRedirect? Are there cases where the main program will directly contain .d.ts outputs but the referenced project will show us equivalent .ts inputs?
• Audit which program should be used to create the module specifier resolution host—it probably should be the main program (look at paths)
• Test cache invalidation (I think it should be working without changes based on conversation with @amcasey. If it doesn’t, this PR is likely not worth it.)
• Consider limiting how many total files/projects we put into the ExportInfoMap
• Test paths module specifier resolution
• Add perf telemetry

Fixes #39778

[andrewbranch]

@typescript-bot pack this

[typescript-bot]

Heya @andrewbranch, I've started to run the tarball bundle task on this PR at cba8f31. You can monitor the build here.

[andrewbranch]

@typescript-bot pack this

[typescript-bot]

Heya @andrewbranch, I've started to run the tarball bundle task on this PR at 38def47. You can monitor the build here.

[typescript-bot]

Hey @andrewbranch, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
    "devDependencies": {
        "typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/119062/artifacts?artifactName=tgz&fileId=C04E800E60475982E62CAB23E0ED257AC83FFA902C56C9A536757DE329E9D18D02&fileName=/typescript-4.6.0-insiders.20220203.tgz"
    }
}

and then running npm install.

---

There is also a playground for this build and an npm module you can use via "typescript": "npm:@typescript-deploys/pr-build@4.6.0-pr-47690-4".;

[amcasey]

Nit: I think the cancellationToken is usually the last parameter.

[andrewbranch]

So it turns out that in TS Server, referenced project changes do not trigger any kind of notification / update / reload of the referencing project, so cache invalidation here doesn’t automatically work. Probably the best thing for this feature will be not to add any referenced-project exports into the ExportMapCache. Seeing as there’s been zero feedback since I’ve started working on this, I’m going to table it for now.

[juanrgm]

I come from #39778 and I tried this patch but I was not lucky.

None suggestions of referenced projects unless I do the first import.