build: use pkgroll

[privatenumber]

Problem

• Using TypeScript to build is slow and requires a complicated setup
• Benchmark:

$ hyperfine 'npm run build'
Benchmark 1: npm run build
  Time (mean ± σ):      7.043 s ±  0.184 s    [User: 13.169 s, System: 0.690 s]
  Range (min … max):    6.815 s …  7.372 s    10 runs

Changes

• Use pkgroll for a simpler & faster build step

• Restructure dist directory to be simpler

  • This could be a breaking change for users that are directly importing a specific path

• Remove tools/post-build.js as pkgroll automatically outputs .mjs file

• I decided not to output sourcemaps because the distribution file is not very different from the source file. Also, because Node.js is the primary use-case, which can't load source-maps out of the box. I can add it back if you'd like.

• Removed unused tsconfig files

• Refactored tsconfig.json to remove irrelevant properties and speed it up

• Benchmark:

$ hyperfine 'npm run build'
Benchmark 1: npm run build
  Time (mean ± σ):      1.928 s ±  0.073 s    [User: 2.906 s, System: 0.295 s]
  Range (min … max):    1.873 s …  2.075 s    10 runs

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4698137

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[privatenumber]

Since we're no longer using tsc to build, this is just a convenience to use tsc only for type-checking during development. Can be removed if you rely on the IDE for type-checking.

For building, npm run build still type-checks because it uses TypeScript to generate the .d.ts file.

[privatenumber]

No longer used. Building is now handled by pkgroll.

[privatenumber]

kolorist doesn't import anything so not really relevant.

[privatenumber]

Faster type-checking.