Optimize the size for tsbuildinfo

[sheetalkamat]

This is simplified version of #43079 and additional optimizations for tsbuildinfo size

Changes are:

1. fileNames : new entry which is list of filenames tsbuildinfo will encounter, index of the file name is used as fileId everywhere
2. fileInfos: is now a list instead of map. FileFnfo is for the file at given fileId as index
3. Semantic diagnostics and affectedFilesPendingEmit also use fileId instead of file name
4. fileIdsList: is a list of fileIds that referenceMap or exportedModulesMap will use. Index of this list will be used as fileIdsListId for reference map
5. referenceMap and exportedModulesMap is converted to tuple array with first entry being fileId and second one being fileIdsListId
6. Instead of emitting tsbuildinfo with 2 space indent, its emitted without spaces
7. Testrunner emits the old format of readable tsbuildinfo as a readable.baseline.txt so that we can verify correctness easily

[sheetalkamat]

@typescript-bot pack this

[sheetalkamat]

@typescript-bot pack this

[typescript-bot]

Heya @sheetalkamat, I've started to run the tarball bundle task on this PR at 41026d7. You can monitor the build here.

[typescript-bot]

Hey @sheetalkamat, 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/97992/artifacts?artifactName=tgz&fileId=CCB541D9CC318BAC74920143D5E2DF0C64321E312E920809A6FF415858B299A602&fileName=/typescript-4.3.0-insiders.20210309.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@4.3.0-pr-43155-3".;

[sokra]

Looks good, I noticed a few minor nitpicks for the test runner

[sokra]

I tried this version in my project.

Total Size: 14.9MB -> 1.0MB
Gzipped size: 526KB -> 251KB

• fileNames size: 134KB
• fileInfos size: 547KB
• fileNamesList size: 283KB
• referencedMap size: 32KB
• exportedModulesMap size: 60KB

[amcasey]

Can you please summarize the high-level changes? Pulling out numeric identifiers seems like an easy win - what else changed?

[amcasey]

My review was somewhat shallow, but the explanation made sense and I didn't notice obvious bugs.