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denoland-deno/cli/tsc
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Nayeem Rahman 5dbf5c8293
fix(bench): explicit timers don't force high precision measurements (#20272) 
Disables `BenchContext::start()` and `BenchContext::end()` for low
precision benchmarks (less than 0.01s per iteration). Prints a warning
when they are used in such benchmarks, suggesting to remove them.

```ts
Deno.bench("noop", { group: "noops" }, () => {});

Deno.bench("noop with start/end", { group: "noops" }, (b) => {
  b.start();
  b.end();
});
```

Before:
```
cpu: 12th Gen Intel(R) Core(TM) i9-12900K
runtime: deno 1.36.2 (x86_64-unknown-linux-gnu)

file:///home/nayeem/projects/deno/temp3.ts
benchmark                    time (avg)        iter/s             (min … max)       p75       p99      p995
----------------------------------------------------------------------------- -----------------------------


noop                          2.63 ns/iter 380,674,131.4    (2.45 ns … 27.78 ns)   2.55 ns   4.03 ns   5.33 ns
noop with start and end     302.47 ns/iter   3,306,146.0     (200 ns … 151.2 µs)    300 ns    400 ns    400 ns

summary
  noop
   115.14x faster than noop with start and end
```

After:
```
cpu: 12th Gen Intel(R) Core(TM) i9-12900K
runtime: deno 1.36.1 (x86_64-unknown-linux-gnu)

file:///home/nayeem/projects/deno/temp3.ts
benchmark                    time (avg)        iter/s             (min … max)       p75       p99      p995
----------------------------------------------------------------------------- -----------------------------


noop                          3.01 ns/iter 332,565,561.7    (2.73 ns … 29.54 ns)   2.93 ns   5.29 ns   7.45 ns
noop with start and end       7.73 ns/iter 129,291,091.5    (6.61 ns … 46.76 ns)   7.87 ns  13.12 ns  15.32 ns
Warning start() and end() calls in "noop with start and end" are ignored because it averages less than 0.01s per iteration. Remove them for better results.

summary
  noop
   2.57x faster than noop with start and end
```
2023-08-26 11:29:45 +02:00
..
dts fix(bench): explicit timers don't force high precision measurements (#20272) 2023-08-26 11:29:45 +02:00
00_typescript.js feat: upgrade to TypeScript 5.1.6 (#19695) 2023-07-04 00:36:35 +02:00
99_main_compiler.js feat(lsp): update imports on file rename (#20245) 2023-08-26 02:50:47 +02:00
compiler.d.ts feat(lsp): update imports on file rename (#20245) 2023-08-26 02:50:47 +02:00
diagnostics.rs fix(tsc): more informative diagnostic when Deno does not exist (#19825) 2023-07-13 23:29:51 +00:00
mod.rs fix(check): should bust check cache when json module or npm resolution changes (#19941) 2023-07-26 17:23:07 -04:00
README.md feat: upgrade to TypeScript 4.9.3 (#16973) 2022-12-07 12:59:59 -05:00

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
gulp local
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/