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perf(binding): box dev and watcher napi futures#10103

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codex/box-napi-futures
Jul 3, 2026
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perf(binding): box dev and watcher napi futures#10103
graphite-app[bot] merged 1 commit into
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codex/box-napi-futures

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@Boshen

@Boshen Boshen commented Jul 2, 2026

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Box dev-engine and watcher NAPI futures through the shared binding helper to reduce async monomorphization in cold exported entry points.

Binary size impact from the profile build:

.text:                 ~11.4 MiB -> ~11.3 MiB
llvm-lines total:      1,891,214 / 51,330 copies -> 1,744,742 / 46,233 copies
tokio poll_future:     44,050 IR lines / 218 copies -> 27,890 / 138
tokio crate bucket:    226.1 KiB -> 183.6 KiB
napi crate bucket:     446.0 KiB -> 424.4 KiB
rolldown_binding:      782.4 KiB -> 765.6 KiB

Validated with cargo fmt --package rolldown_binding, cargo check -p rolldown_binding --lib, cargo llvm-lines, cargo bloat, just lint-rust, and just build-rolldown.

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Deploy Preview for rolldown-rs canceled.

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🔨 Latest commit 7161d23
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@Boshen
Boshen force-pushed the codex/box-napi-futures branch 2 times, most recently from 20190d1 to 7ce648f Compare July 3, 2026 00:13
@Boshen
Boshen marked this pull request as ready for review July 3, 2026 00:22
@codspeed-hq

codspeed-hq Bot commented Jul 3, 2026

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Merging this PR will not alter performance

✅ 7 untouched benchmarks
⏩ 10 skipped benchmarks1


Comparing codex/box-napi-futures (7ce648f) with main (3325bf7)

Open in CodSpeed

Footnotes

  1. 10 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports.

@IWANABETHATGUY

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watcher.rs keeps #[tracing::instrument(level = "debug", skip_all)] on run, wait_for_close, and close, which are now synchronous fns returning a future. tracing::instrument only wraps the future body for async fn; on a sync fn it enters the span only for the synchronous setup and exits before the boxed future is polled.

  • run is unaffected in substance — its body (inner.run()) is synchronous, so the span still covers the real work.
  • wait_for_close and close now have their meaningful .await running outside the span. Previously the wait_for_close span measured the whole watcher lifetime; now it measures just the Arc::clone + spawn and closes immediately.

If that span coverage matters, the fix is to instrument the async block instead, e.g.:

use tracing::Instrument;
let span = tracing::debug_span!("wait_for_close");
spawn_boxed_future(env, async move {
    inner.wait_for_close().await;
    Ok(())
}.instrument(span))

Boshen commented Jul 3, 2026

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Merge activity

Box dev-engine and watcher NAPI futures through the shared binding helper to reduce async monomorphization in cold exported entry points.

Binary size impact from the profile build:

```text
.text:                 ~11.4 MiB -> ~11.3 MiB
llvm-lines total:      1,891,214 / 51,330 copies -> 1,744,742 / 46,233 copies
tokio poll_future:     44,050 IR lines / 218 copies -> 27,890 / 138
tokio crate bucket:    226.1 KiB -> 183.6 KiB
napi crate bucket:     446.0 KiB -> 424.4 KiB
rolldown_binding:      782.4 KiB -> 765.6 KiB
```

Validated with `cargo fmt --package rolldown_binding`, `cargo check -p rolldown_binding --lib`, `cargo llvm-lines`, `cargo bloat`, `just lint-rust`, and `just build-rolldown`.
@graphite-app
graphite-app Bot force-pushed the codex/box-napi-futures branch from 7ce648f to 7161d23 Compare July 3, 2026 05:44
@graphite-app
graphite-app Bot merged commit 7161d23 into main Jul 3, 2026
34 checks passed
@graphite-app
graphite-app Bot deleted the codex/box-napi-futures branch July 3, 2026 05:49
@rolldown-guard rolldown-guard Bot mentioned this pull request Jul 8, 2026
shulaoda added a commit that referenced this pull request Jul 8, 2026
## [1.1.5] - 2026-07-08

### 🚀 Features

- detect top-level import-binding reads as execution-order sensitive (#10180) by @hyf0
- sourcemap_filenames: add a sourcemapFileNames option (#9271) by @V1OL3TF0X
- binding: record plugin hook result kind in tracing spans (#10154) by @IWANABETHATGUY
- linking: skip side-effect-free modules in per-entry reachability (#10111) by @IWANABETHATGUY
- improve error message for unresolved virtual imports (#10156) by @sapphi-red
- add descriptive metadata to plugin API (#10106) by @sapphi-red
- add `--configLoader=native` option (#10118) by @sapphi-red

### 🐛 Bug Fixes

- improve invalid annotation warnings (#10185) by @hyf0
- keep deduplicated asset filenames stable once they can be observed (#10191) by @shulaoda
- sourcemap_filenames: use public option name in pattern errors (#10188) by @IWANABETHATGUY
- sourcemap_filenames: hash prepared sourcemap content (#10178) by @hyf0
- tree-shake unused circular declarators exported via export list (#10166) by @IWANABETHATGUY
- dev: don't panic when an HMR rebuild hits an unresolved import (#10162) by @shulaoda
- propagate errors from output.globals function (#9880) by @shulaoda
- dev: revert cache mutations when a partial scan fails (#10110) by @shulaoda
- dev: update importer relationships of cached modules in incremental build (#10107) by @shulaoda
- hmr: fall back to full reload when a changed module is not registered as executed (#10132) by @shulaoda
- chunk-optimizer: follow entry facade edges in runtime placement cycle check (#10101) by @hyf0
- dev: ignore watcher events after close (#10113) by @hyf0
- emit async wrapper for TLA modules under onDemandWrapping (#10086) by @IWANABETHATGUY
- gate sideEffects:false modules' side effects on body demand (#10080) by @IWANABETHATGUY
- rolldown_plugin_vite_resolve: return empty object for `browser: false` mapped modules (#10082) by @sapphi-red
- reset the word-boundary state on newline in Hires::Boundary sourcemaps (#10025) by @shulaoda
- trim an emptied chunk's outro/intro instead of skipping past it (#10029) by @shulaoda
- test each edited chunk's own start against indent exclude ranges (#10026) by @shulaoda
- preserve sourcemap mappings for indented lines when a CJS module shares the chunk (#10074) by @hyf0

### 🚜 Refactor

- separate tree-shaking side effects from execution order sensitivity (#10168) by @hyf0
- type construct_vite_preload_call to take an ObjectPattern (#10135) by @shulaoda
- treeshake: single-source the own-export classification shared with the lazy-barrel loader (#10098) by @IWANABETHATGUY
- dev: reuse Vite's bundledDev server (#10081) by @h-a-n-a
- clippy: ban std HashMap/HashSet in favour of FxHashMap/FxHashSet (#10108) by @Boshen
- treeshake: make body demand a second module bit instead of a stmt multimap (#10097) by @IWANABETHATGUY
- seal used_symbol_refs by construction after its last writer (#10091) by @hyf0
- treeshake: replace inclusion mutual recursion with a worklist engine (#10096) by @IWANABETHATGUY
- treeshake: split include_statements.rs into focused modules (#10095) by @IWANABETHATGUY
- drop redundant is_user_defined filter on partitioned entries (#10050) by @shulaoda
- project the retained export interface out of used_symbol_refs (#10089) by @hyf0
- track used external symbols separately from used_symbol_refs (#10088) by @hyf0
- make module namespace inclusion an explicit linking metadata field (#10087) by @hyf0
- rename statement evaluation metadata (#10078) by @hyf0

### 📚 Documentation

- virtual modules user-facing id convention (#10155) by @sapphi-red
- cli: clarify disabling boolean/object flags like codeSplitting (#10153) by @IWANABETHATGUY
- chore: remove Vite+ alpha banner (#10105) by @mdong1909
- write down the used_symbol_refs contract (#10090) by @hyf0
- dev/lazy: update design and implementation (#10079) by @h-a-n-a

### ⚡ Performance

- ast_scanner: stop order-sensitivity checks once a module is flagged (#10190) by @IWANABETHATGUY
- return impl ExactSizeIterator from slice-backed accessors (#10133) by @Boshen
- binding: box dev and watcher napi futures (#10103) by @Boshen

### 🧪 Testing

- move string_wizard replace unit tests to the JS magic-string suite (#10176) by @IWANABETHATGUY
- dev: assert incremental scan state matches a fresh full build after each HMR step (#10115) by @shulaoda
- dev: restore runtime assertions of delete_file_not_used_anymore (#10112) by @shulaoda
- dev: fix flaky dev server tests in CI (#10152) by @h-a-n-a
- add regression test for #10099 (lazyBarrel drops default-import binding but keeps its property reads) (#10109) by @IWANABETHATGUY

### ⚙️ Miscellaneous Tasks

- deploy website to Void via GitHub OIDC (#10192) by @Boshen
- deps: update oxc to 0.139.0 (#10161) by @shulaoda
- deps: update test262 submodule for tests (#10160) by @rolldown-guard[bot]
- rolldown_plugin_utils: remove dead asset-url and css scaffolding (#10131) by @shulaoda
- deps: revert vite-plus to v0.2.1 (#10148) by @shulaoda
- deps: update github actions (#10141) by @renovate[bot]
- deps: update dependency rust to v1.96.1 (#10145) by @renovate[bot]
- deps: update npm packages (#10142) by @renovate[bot]
- deps: update rust crates (#10143) by @renovate[bot]
- deps: update napi to v3.10.3 (#10121) by @renovate[bot]
- rolldown_utils: remove unused time module (#10138) by @shulaoda
- remove dead CopyModulePlugin::is_active method (#10129) by @shulaoda
- remove dead LazyCompilationContext::is_lazy_module method (#10128) by @shulaoda
- remove dead BuildDiagnostic::downcast_ref method (#10127) by @shulaoda
- deps: update dependency vite-plus to v0.2.2 (#10084) by @renovate[bot]
- deps: update rust crate oxc_sourcemap to v8.1.0 (#10122) by @renovate[bot]
- deps: update crate-ci/typos action to v1.48.0 (#10124) by @renovate[bot]
- enable more clippy restriction lints (#10114) by @Boshen
- deps: update rust dependencies (#10100) by @Boshen
- deps: update oxc resolver to v11.23.0 (#10083) by @renovate[bot]

### ◀️ Revert

- Revert "chore(deps): revert vite-plus to v0.2.1" (#10157) by @h-a-n-a
- "fix(hmr): fall back to full reload when a changed module is not registered as executed (#10132)" (#10151) by @shulaoda

### ❤️ New Contributors

* @V1OL3TF0X made their first contribution in [#9271](#9271)

Co-authored-by: shulaoda <[email protected]>
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