feat(template-webpack-plugin): parallelize TASM encode in a shared worker pool by upupming · Pull Request #2634 · lynx-family/lynx-stack

upupming · 2026-05-14T07:57:59Z

Summary

Move template encoding into a process-wide tinypool worker pool so multi-entry builds encode in parallel (cpus().length - 1 threads) instead of serializing on the main thread.
Watch-mode rebuilds reuse warm workers across compiles — the pool is a static field on LynxEncodePlugin, lazily spawned on first encode.
Buffer.from(uint8Array) rewraps the postMessage-demoted buffer back to a real Buffer so downstream consumers (rspack's WasmHash) can still call .copy() on it.
The worker file URL always resolves to the built lib/worker/encode.js, so the static pool initializer works both from src/ (in-tree tests) and lib/ (installed consumers).

Test plan

pnpm exec rstest run in packages/webpack/template-webpack-plugin — 346 / 346 pass (including 2 new tests in test/encode-worker-pool.test.ts)
pnpm build in examples/react succeeds with the new pool path
New tests assert pool.completed += N for N-entry builds and that rebuild does not spawn new workers

Summary by CodeRabbit

New Features
- Enabled parallel TASM template encoding for multi-entry builds.
- Optimized watch-mode rebuilds with encoder worker reuse for faster iteration.
Chores
- Tightened Node.js version requirement to ^18.14 || >=19.4.

…rker pool Move template encoding into a process-wide `tinypool` worker pool so: - Multi-entry builds encode in parallel up to `cpus().length - 1` threads instead of serializing on the main thread. - Watch-mode rebuilds reuse warm workers across compiles. `Buffer.from(uint8Array)` rewraps the postMessage-demoted buffer back to a real `Buffer` so downstream consumers (rspack's `WasmHash`) can still call `.copy()` on it. The worker file URL always resolves to the built `lib/worker/encode.js` so the static pool initializer works both from `src/` (in-tree tests) and `lib/` (installed consumers).

changeset-bot · 2026-05-14T07:58:05Z

🦋 Changeset detected

Latest commit: d3dfcfe

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@lynx-js/template-webpack-plugin	Patch
@lynx-js/react-rsbuild-plugin	Patch
@lynx-js/react-alias-rsbuild-plugin	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

coderabbitai · 2026-05-14T07:58:07Z

📝 Walkthrough

Walkthrough

This PR introduces parallel TASM template encoding via a shared Tinypool worker pool in the webpack plugin, enabling concurrent multi-entry builds and warm worker reuse during watch-mode rebuilds. The implementation adds a worker module, configures a static pool in LynxEncodePlugin, updates package dependencies and the public API surface, and includes tests verifying parallel execution and worker thread reuse.

Changes

Parallel Template Encoding via Tinypool

Layer / File(s)	Summary
Worker module for isolated encoding `packages/webpack/template-webpack-plugin/src/worker/encode.ts`	New `encode.ts` exports `EncodeWorkerOptions` interface and an async `encode` function that dynamically loads TASM and executes template encoding in an isolated worker thread context, returning serialized `EncodeResult`.
LynxEncodePlugin pool configuration and hook `packages/webpack/template-webpack-plugin/src/LynxEncodePlugin.ts`	Imports ESM interop utilities, resolves the worker module path via `require.resolve`, initializes a static `encodePool` Tinypool with CPU-aware thread sizing, and updates the `templateHooks.encode` hook to dispatch encoding through the shared pool instead of calling TASM directly; restructures the hook to deserialize the worker's `buffer` result.
Package dependencies, Node version, and API surface `packages/webpack/template-webpack-plugin/package.json`, `packages/webpack/template-webpack-plugin/etc/template-webpack-plugin.api.md`, `.changeset/parallel-template-encode.md`	Adds `tinypool` runtime dependency and tightens Node engine constraint to `^18.14
Worker pool parallelism and reuse verification tests `packages/webpack/template-webpack-plugin/test/encode-worker-pool.test.ts`	Adds test suite with `runWebpack` helper that confirms multi-entry builds dispatch parallel encode tasks through the pool (checking `completed` counter and thread count), and validates that subsequent compiles in the same process reuse warm worker threads without spawning new ones.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

lynx-family/lynx-stack#2519: Both PRs modify the template-webpack-plugin's LynxEncodePlugin encode/emit pipeline around cssDiagnostics (the main PR moves encoding into a Tinypool worker that returns cssDiagnostics, while the retrieved PR changes how cssDiagnostics sourcemaps are resolved per template and wires it into beforeEmit).

Suggested reviewers

colinaaa
luhc228

Poem

🐰 In threads so warm, our TASM spins fast,
Parallel pools where workers are cast,
Multi-entry builds now dance with glee,
Reused warm threads in harmony! 🔄✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly describes the main change: parallelizing TASM template encoding using a shared worker pool in the template-webpack-plugin.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
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codecov · 2026-05-14T08:04:22Z

Codecov Report

❌ Patch coverage is 20.83333% with 19 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...bpack/template-webpack-plugin/src/worker/encode.ts	7.69%	12 Missing ⚠️
...ck/template-webpack-plugin/src/LynxEncodePlugin.ts	36.36%	7 Missing ⚠️

📢 Thoughts on this report? Let us know!

…rker/encode.js')` Drops the conditional `.ts`/`.js` detection and `--experimental-strip-types` plumbing. Tests now require `lib/` to be built first, but the resolution itself is a single line and works the same in src/ and lib/ contexts via `createRequire(import.meta.url)`.

codspeed-hq · 2026-05-14T09:06:16Z

Merging this PR will not alter performance

✅ 81 untouched benchmarks
⏩ 26 skipped benchmarks¹

_{Comparing feat/parallel-template-encode (d3dfcfe) with main (189be6c)}

26 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. ↩

relativeci · 2026-05-14T09:16:43Z

React Example

#8214 Bundle Size — 236.51KiB (0%).

d3dfcfe(current) vs 189be6c main#8210(baseline)

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^{Generated by RelativeCI Documentation Report issue}

relativeci · 2026-05-14T09:16:44Z

React External

#1328 Bundle Size — 693.04KiB (0%).

d3dfcfe(current) vs 189be6c main#1324(baseline)

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	Current #1328	Baseline #1324
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Bundle analysis report Branch feat/parallel-template-encode Project dashboard

^{Generated by RelativeCI Documentation Report issue}

relativeci · 2026-05-14T09:16:44Z

React Example with Element Template

#480 Bundle Size — 199.83KiB (0%).

d3dfcfe(current) vs 189be6c main#476(baseline)

Bundle metrics

2 changes

	Current #480	Baseline #476
Initial JS	`0B`	`0B`
Initial CSS	`0B`	`0B`
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Bundle size by type no changes

	Current #480	Baseline #476
IMG	`145.76KiB`	`145.76KiB`
Other	`54.08KiB`	`54.08KiB`

Bundle analysis report Branch feat/parallel-template-encode Project dashboard

^{Generated by RelativeCI Documentation Report issue}

relativeci · 2026-05-14T09:17:11Z

Web Explorer

#9788 Bundle Size — 901.38KiB (0%).

d3dfcfe(current) vs 189be6c main#9784(baseline)

Bundle metrics

2 changes

	Current #9788	Baseline #9784
Initial JS	`45.06KiB`	`45.06KiB`
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Chunks	`9`	`9`
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	Current #9788	Baseline #9784
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Bundle analysis report Branch feat/parallel-template-encode Project dashboard

^{Generated by RelativeCI Documentation Report issue}

relativeci · 2026-05-14T09:17:47Z

React MTF Example

#1347 Bundle Size — 207.46KiB (0%).

d3dfcfe(current) vs 189be6c main#1343(baseline)

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Initial JS	`0B`	`0B`
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Bundle analysis report Branch feat/parallel-template-encode Project dashboard

^{Generated by RelativeCI Documentation Report issue}

`availableParallelism()` already reflects cgroup CPU limits on container hosts, so subtracting one for the main thread is wasted capacity rather than safety margin. Drops the `-1`. Bumps `engines.node` to `^18.14 || >=19.4` — the version range where the backported `os.availableParallelism()` is actually available.

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coderabbitai

🧹 Nitpick comments (2)

packages/webpack/template-webpack-plugin/test/encode-worker-pool.test.ts (1)
11-11: ⚡ Quick win

Use fileURLToPath for cross-platform compatibility.

new URL(import.meta.url).pathname can produce invalid paths on Windows (e.g., /C:/path/to/file). Import and use fileURLToPath from node:url instead:
🔧 Suggested fix
-import { dirname } from 'node:path';
+import { dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';

-const context = dirname(new URL(import.meta.url).pathname);
+const context = dirname(fileURLToPath(import.meta.url));
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/webpack/template-webpack-plugin/test/encode-worker-pool.test.ts` at
line 11, Replace the platform-unsafe pathname extraction used to build context:
instead of dirname(new URL(import.meta.url).pathname) use
fileURLToPath(import.meta.url) and dirname(...) around that; import
fileURLToPath from 'node:url' and update the code that defines the context
variable (the usage of dirname and import.meta.url) to call
fileURLToPath(import.meta.url) so paths are correct on Windows.
packages/webpack/template-webpack-plugin/src/LynxEncodePlugin.ts (1)
21-23: 💤 Low value

Clarify worker path resolution assumption.

The worker path require.resolve('../lib/worker/encode.js') assumes the TypeScript source has been compiled to lib/ before this code runs. The PR summary states this "enables the static pool initializer to work both from src/ (in-tree tests) and lib/ (installed consumers)," but actually it requires lib/worker/encode.js to exist in both cases.

Since tests pass, the build likely happens before test execution. Consider clarifying this in a comment or ensuring the README documents the build requirement for running tests.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/webpack/template-webpack-plugin/src/LynxEncodePlugin.ts` around
lines 21 - 23, The code currently sets ENCODE_WORKER_PATH via
require.resolve('../lib/worker/encode.js') which assumes compiled output exists;
update the file to either (a) add a short clarifying comment above
ENCODE_WORKER_PATH documenting that tests and consumers require the TS -> lib
build step, or (b) implement a robust resolution fallback for ENCODE_WORKER_PATH
that first tries require.resolve('../lib/worker/encode.js') and if that fails
falls back to resolving the in-tree source (e.g., ../src/worker/encode.ts or
../src/worker/encode.js) using createRequire(import.meta.url); reference the
ENCODE_WORKER_PATH constant and the createRequire/import.meta.url call when
changing the resolution logic, or update the README to state the build
requirement for running tests if you choose the comment-only option.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In `@packages/webpack/template-webpack-plugin/src/LynxEncodePlugin.ts`:
- Around line 21-23: The code currently sets ENCODE_WORKER_PATH via
require.resolve('../lib/worker/encode.js') which assumes compiled output exists;
update the file to either (a) add a short clarifying comment above
ENCODE_WORKER_PATH documenting that tests and consumers require the TS -> lib
build step, or (b) implement a robust resolution fallback for ENCODE_WORKER_PATH
that first tries require.resolve('../lib/worker/encode.js') and if that fails
falls back to resolving the in-tree source (e.g., ../src/worker/encode.ts or
../src/worker/encode.js) using createRequire(import.meta.url); reference the
ENCODE_WORKER_PATH constant and the createRequire/import.meta.url call when
changing the resolution logic, or update the README to state the build
requirement for running tests if you choose the comment-only option.

In `@packages/webpack/template-webpack-plugin/test/encode-worker-pool.test.ts`:
- Line 11: Replace the platform-unsafe pathname extraction used to build
context: instead of dirname(new URL(import.meta.url).pathname) use
fileURLToPath(import.meta.url) and dirname(...) around that; import
fileURLToPath from 'node:url' and update the code that defines the context
variable (the usage of dirname and import.meta.url) to call
fileURLToPath(import.meta.url) so paths are correct on Windows.

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📒 Files selected for processing (6)

.changeset/parallel-template-encode.md
packages/webpack/template-webpack-plugin/etc/template-webpack-plugin.api.md
packages/webpack/template-webpack-plugin/package.json
packages/webpack/template-webpack-plugin/src/LynxEncodePlugin.ts
packages/webpack/template-webpack-plugin/src/worker/encode.ts
packages/webpack/template-webpack-plugin/test/encode-worker-pool.test.ts

This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## @lynx-js/autolink-codegen@0.1.0 ### Minor Changes - Add the Native Autolink codegen package. ([#2601](#2601)) ## create-lynx-extension@0.1.0 ### Minor Changes - Add the Native Autolink create-extension package. ([#2587](#2587)) ### Patch Changes - Use published package versions for scaffolded autolink codegen dependencies instead of workspace placeholders. ([#2628](#2628)) - Fix npm bin symlink entrypoint detection for the create extension CLI. ([#2623](#2623)) ## @lynx-js/react@0.121.0 ### Minor Changes - Support `React.createElement(type, props, children)` API. ([#2360](#2360)) ```jsx React.createElement("view", { style }, <text>hello</text>); // equivalent to <view style={style}> <text>hello</text> </view>; React.createElement(MyComponent, { style }, <view />); // equivalent to <MyComponent style={style}> <view /> </MyComponent>; ``` ### Patch Changes - Clear transient snapshot child props when removed snapshot subtrees are detached, preventing compiled `$*` child references from retaining deleted list holder or list item subtrees after removal. ([#2590](#2590)) - Add `createPortal` for rendering a subtree into a different ReactLynx element identified by a `NodesRef`. ([#2543](#2543)) ```tsx function App() { const [host, setHost] = useState(null); return ( <view> <view ref={setHost} /> {host && createPortal(<text>hi</text>, host)} </view> ); } ``` - Default `fireEvent` to `bubbles: true` for the TouchEvent family in testing-library to match Lynx runtime semantics, and stop reassigning the read-only `Event.prototype` accessors which threw `TypeError` in strict mode. ([#2532](#2532)) - Set `bundle-url` on lazy bundle border elements. ([#2537](#2537)) - Stop warning when `runWorklet` receives an invalid or missing main-thread function object. Invalid worklet contexts are still ignored, but nullish handler values no longer produce noisy `MainThreadFunction: Invalid function object` console output. ([#2586](#2586)) - Retain main-thread worklet context references before offscreen snapshot elements are materialized, so event, ref, gesture, and spread callbacks stay alive until the DOM update path can attach them. ([#2592](#2592)) - Update the @lynx-js/tasm dependency to 0.0.39 and align React template attribute descriptors with it. ([#2643](#2643)) - Avoid retaining transformed nested worklet contexts after worklet transformation. ([#2591](#2591)) Nested worklets transformed by the worklet runtime now keep their context recovery metadata through a weak reference, preventing cached transformed worklet functions from keeping list-item worklet contexts alive. ## @lynx-js/docs-mcp-server@0.2.3 ### Patch Changes - fix(docs-mcp): recursively crawl and register nested llms.txt resources ([#2317](#2317)) ## @lynx-js/rspeedy@0.14.4 ### Patch Changes - feat(qrcode): support get entry from api exposed from rspeedy.env.entries ([#2551](#2551)) - Updated dependencies \[[`ad1f90f`](ad1f90f)]: - @lynx-js/chunk-loading-webpack-plugin@0.3.4 - @lynx-js/web-rsbuild-server-middleware@0.20.4 - @lynx-js/cache-events-webpack-plugin@0.0.3 ## @lynx-js/lynx-bundle-rslib-config@0.3.3 ### Patch Changes - Update the @lynx-js/tasm dependency to 0.0.39 and align React template attribute descriptors with it. ([#2643](#2643)) ## @lynx-js/qrcode-rsbuild-plugin@0.4.7 ### Patch Changes - feat(qrcode): support get entry from api exposed from rspeedy.env.entries ([#2551](#2551)) ## @lynx-js/react-rsbuild-plugin@0.16.2 ### Patch Changes - Updated dependencies \[[`3e627b3`](3e627b3), [`7b8d63c`](7b8d63c), [`13a0776`](13a0776), [`a973c54`](a973c54), [`353b1b7`](353b1b7)]: - @lynx-js/template-webpack-plugin@0.11.1 - @lynx-js/react-refresh-webpack-plugin@0.3.6 - @lynx-js/react-alias-rsbuild-plugin@0.16.2 - @lynx-js/use-sync-external-store@1.5.0 - @lynx-js/react-webpack-plugin@0.9.2 - @lynx-js/css-extract-webpack-plugin@0.7.1 ## @lynx-js/web-core@0.20.4 ### Patch Changes - Always clone touch event lists when creating cross-thread events so synthetic touch events only carry structured-clone-safe primitive fields. ([#2636](#2636)) - Conditionally pass Card and Component params based on cardType in background thread. ([#2610](#2610)) - Add bidirectional decode worker heartbreak liveness messages. ([#2599](#2599)) - Add web support for the `<frame>` element by mapping it to `<lynx-view>`. ([#2604](#2604)) - Stop redeclaring `fetch` as a chunk-scope binding. Reusing the host ([#2562](#2562)) `window.fetch` from BTS chunks (instead of capturing the no-op stub the chunk wrapper used to install) lets the renderer issue real network requests. - Updated dependencies \[[`c1db603`](c1db603)]: - @lynx-js/web-elements@0.12.2 - @lynx-js/web-worker-rpc@0.20.4 ## @lynx-js/web-elements@0.12.2 ### Patch Changes - fix: xmarkdown create img incorrectly ([#2540](#2540)) ## @lynx-js/chunk-loading-webpack-plugin@0.3.4 ### Patch Changes - Override `__webpack_require__.e` so a single sync-then chunk load (the ([#2597](#2597)) typical lazy bundle case) bypasses `Promise.all`. It will make first screen in main thread can load lazy bundle synchronously when using dynamic import. ## @lynx-js/react-refresh-webpack-plugin@0.3.6 ### Patch Changes - Widen `@lynx-js/react-webpack-plugin` peer range to include `^0.9.0`. ([#2626](#2626)) ## @lynx-js/template-webpack-plugin@0.11.1 ### Patch Changes - feat(web): enable web binary template by default ([#2545](#2545)) The default encoding format for the web platform template has been changed from JSON to Binary. **Benefits for developers:** - **Smaller output size:** Binary templates are more compact than JSON strings, reducing the final bundle size. - **Faster load performance:** Binary templates parse faster than JSON in the runtime, improving the time-to-interactive for web applications. **How to turn off this feature:** If you encounter any issues with the new binary template format, you can revert to the previous JSON format by setting the environment variable `EXPERIMENTAL_USE_WEB_BINARY_TEMPLATE` to `'false'` or `'0'` before running your build commands. For example: `EXPERIMENTAL_USE_WEB_BINARY_TEMPLATE=false rspeedy build` **Upgrade to `@lynx-js/web-core@0.20.2` could support the new output format** See [`@lynx-js/web-core` Changelog](https://lynx-stack.dev/changelog/lynx-js--web-core) - Run TASM template encoding in a shared `tinypool` worker pool so multi-entry builds encode in parallel and watch-mode rebuilds reuse warm workers. ([#2634](#2634)) - Make `LynxTemplatePlugin.getLynxTemplatePluginHooks` a cross-module singleton so duplicate copies of this package (e.g. from npm hoist conflicts) share the same hooks per compilation. ([#2624](#2624)) - Update the @lynx-js/tasm dependency to 0.0.39 and align React template attribute descriptors with it. ([#2643](#2643)) - Updated dependencies \[[`ee79eff`](ee79eff), [`ded4de9`](ded4de9), [`cf01e94`](cf01e94), [`b989c1c`](b989c1c), [`8417e68`](8417e68)]: - @lynx-js/web-core@0.20.4 ## @lynx-js/react-umd@0.121.0 ## create-rspeedy@0.14.4 ## @lynx-js/react-alias-rsbuild-plugin@0.16.2 ## upgrade-rspeedy@0.14.4 ## @lynx-js/web-rsbuild-server-middleware@0.20.4 ## @lynx-js/web-worker-rpc@0.20.4 Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

upupming added 2 commits May 14, 2026 16:21

fixup: regenerate api-extractor report for new encodePool static

e86d182

colinaaa previously approved these changes May 14, 2026

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upupming dismissed colinaaa’s stale review via d3dfcfe May 14, 2026 09:54

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upupming marked this pull request as ready for review May 14, 2026 10:04

upupming requested a review from luhc228 as a code owner May 14, 2026 10:04

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Comment thread packages/webpack/template-webpack-plugin/src/LynxEncodePlugin.ts

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upupming merged commit 7b8d63c into main May 14, 2026
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upupming deleted the feat/parallel-template-encode branch May 14, 2026 10:58

github-actions Bot mentioned this pull request May 14, 2026

chore: Release 2026-05-18 01:41:54 #2535

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🦋 Changeset detected

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Walkthrough

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Codecov Report

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Merging this PR will not alter performance

Footnotes

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React Example

#8214 Bundle Size — 236.51KiB (0%).

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React External

#1328 Bundle Size — 693.04KiB (0%).

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React Example with Element Template

#480 Bundle Size — 199.83KiB (0%).

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Web Explorer

#9788 Bundle Size — 901.38KiB (0%).

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React MTF Example

#1347 Bundle Size — 207.46KiB (0%).

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2 participants

upupming commented May 14, 2026 •

edited by coderabbitai Bot

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changeset-bot Bot commented May 14, 2026 •

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coderabbitai Bot commented May 14, 2026 •

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codecov Bot commented May 14, 2026 •

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relativeci Bot commented May 14, 2026 •

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relativeci Bot commented May 14, 2026 •

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relativeci Bot commented May 14, 2026 •

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relativeci Bot commented May 14, 2026 •

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relativeci Bot commented May 14, 2026 •

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