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deno/cli/tsc
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Nathan Whitaker 33bccf9090
perf(check): use v8 code cache for extension sources in deno check (#28089) 
In particular this helps startup of the TSC isolate because
`00_typescript.js` can use the code cache.

Overall, this offsets a fair bit of the hit we took when we removed the
TSC snapshot.

```
❯ hyperfine --warmup 5 -p "rm -rf ~/Library/Caches/deno/check_cache_v2" "./deno-this-pr check main.ts" "./deno-no-snapshot check main.ts" "./deno-with-snapshot check main.ts"
Benchmark 1: ../../deno/target/release-lite/deno check main.ts
  Time (mean ± σ):     145.7 ms ±   3.6 ms    [User: 347.6 ms, System: 36.9 ms]
  Range (min … max):   142.2 ms … 155.9 ms    19 runs

Benchmark 2: ./deno-no-snapshot check main.ts
  Time (mean ± σ):     195.4 ms ±   3.3 ms    [User: 397.7 ms, System: 34.9 ms]
  Range (min … max):   192.1 ms … 206.0 ms    15 runs

Benchmark 3: ./deno-with-snapshot check main.ts
  Time (mean ± σ):     109.0 ms ±   2.2 ms    [User: 155.9 ms, System: 19.3 ms]
  Range (min … max):   106.5 ms … 118.0 ms    26 runs

Summary
  ./deno-with-snapshot check main.ts ran
    1.34 ± 0.04 times faster than ./deno-this-pr check main.ts
    1.79 ± 0.05 times faster than ./deno-no-snapshot check main.ts
```
2025-02-12 17:47:00 +00:00
..
dts perf(lsp): add built-in tracing support for the LSP (#27843) 2025-02-12 08:40:40 -08:00
00_typescript.js perf(lsp): add built-in tracing support for the LSP (#27843) 2025-02-12 08:40:40 -08:00
97_ts_host.js perf(lsp): add built-in tracing support for the LSP (#27843) 2025-02-12 08:40:40 -08:00
98_lsp.js perf(lsp): add built-in tracing support for the LSP (#27843) 2025-02-12 08:40:40 -08:00
99_main_compiler.js refactor: remove tsc snapshot (#28056) 2025-02-11 15:36:07 +01:00
_analyze_types_node.ts chore: Happy New Year 2025 (#27509) 2024-12-31 19:12:39 +00:00
compiler.d.ts chore: Happy New Year 2025 (#27509) 2024-12-31 19:12:39 +00:00
diagnostics.rs fix(check): compiler options from workspace members (#27785) 2025-01-28 10:49:58 -05:00
mod.rs perf(check): use v8 code cache for extension sources in deno check (#28089) 2025-02-12 17:47:00 +00:00
README.md feat: TypeScript 5.4 (#23086) 2024-03-26 18:52:57 -04:00

README.md

tsc

This directory contains the typescript compiler and a small compiler host for the runtime snapshot.

How to upgrade TypeScript.

The files in this directory are mostly from the TypeScript repository. We currently (unfortunately) have a rather manual process for upgrading TypeScript. It works like this currently:

  1. Checkout denoland/TypeScript repo in a separate directory.
  2. Add Microsoft/TypeScript as a remote and fetch its latest tags
  3. Checkout a new branch based on this tag.
  4. Cherry pick the custom commit we made in a previous release to the new one.
  5. This commit has a "deno.ts" file in it. Read the instructions in it.
  6. Copy typescript.js into Deno repo.
  7. Copy d.ts files into dts directory.
  8. Review the copied files, removing and reverting what's necessary

So that might look something like this:

git clone https://github.com/denoland/TypeScript.git
cd typescript
git remote add upstream https://github.com/Microsoft/TypeScript
git fetch upstream
git checkout v3.9.7
git checkout -b branch_v3.9.7
git cherry pick <previous-release-branch-commit-we-did>
npm install
npx hereby
rsync built/local/typescript.js ~/src/deno/cli/tsc/00_typescript.js
rsync --exclude=protocol.d.ts --exclude=tsserverlibrary.d.ts --exclude=typescriptServices.d.ts built/local/*.d.ts ~/src/deno/cli/tsc/dts/