GeezerVison

TypeScript Bot (@typescript-bot) test this
TypeScript Bot (@typescript-bot) user test this
TypeScript Bot (@typescript-bot) run dt
TypeScript Bot (@typescript-bot) perf test this faster

Heya Anders Hejlsberg (@ahejlsberg), I've started to run the abridged perf test suite on this PR at 8ac7030. You can monitor the build here.

Update: The results are in!

Heya Anders Hejlsberg (@ahejlsberg), I've started to run the parallelized community code test suite on this PR at 8ac7030. You can monitor the build here.

Heya Anders Hejlsberg (@ahejlsberg), I've started to run the extended test suite on this PR at 8ac7030. You can monitor the build here.

Heya Anders Hejlsberg (@ahejlsberg), I've started to run the parallelized Definitely Typed test suite on this PR at 8ac7030. You can monitor the build here.

Rob Palmer (@robpalme) This is the continuation PR I mentioned in #42149. Give it a try and let me know how it goes.

Anders Hejlsberg (@ahejlsberg)
The results of the perf run you requested are in!

The user suite test run you requested has finished and failed. I've opened a PR with the baseline diff from master.

Tests all look good, only changes are improved diagnostics. Performance is unaffected.

TypeScript Bot (@typescript-bot) pack this

Heya Daniel Rosenwasser (@DanielRosenwasser), I've started to run the tarball bundle task on this PR at 8ac7030. You can monitor the build here.

Hey Daniel Rosenwasser (@DanielRosenwasser), 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/93139/artifacts?artifactName=tgz&fileId=4FE49FBE4115C3F38EC02DE524EF9087A6729DD9744C9B257007FE5D69F77D1202&fileName=/typescript-4.2.0-insiders.20210111.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/[email protected]".;

Anders Hejlsberg (@ahejlsberg) This is even better than the previous attempt 🎉

As before, there are no inlining/size regressions - I reviewed every changed line and this PR is a pure win. This PR improves upon 2c2d06d by also handling aliases to Record and Pick<obj, union>.

// Previous: 2c2d06
  myRecordProp: Record<string, any>;
  myObjectProp: Pick<{
      lotsOfProps,
    }, "red" | "green" | "blue
  >;

...is replaced by...

// Master: Using PR#42284
  myRecordProp: MyRecordType;
  myObjectProp: MyColorsOnly<{
      lotsOfProps,
    }
  >;

On the large package I referred to in previous reports, this PR results in a further 10KB decrease vs the previous attempt, i.e the Record & Pick changes explains the 10KB win. Meaning the net effect of this PR is now:

• 50 declaration files out of 394 were affected by this PR
• Net size of all declaration files shrank by 41KB
  • 50 files shrank (total size of these files reduced by 41KB from 585KB to 544KB)
  • 0 files grew