Add experimental TSRX compiler frontends by ryansolid · Pull Request #3086 · solidjs/solid

ryansolid · 2026-08-28T04:33:12Z

Summary

add first-class .tsrx syntax routing to both @solidjs/babel-plugin and @solidjs/compiler
lower TSRX control flow, statement containers, dynamic tags, and lazy destructuring through the existing Solid JSX pipelines with shared parity/runtime coverage
compile scoped <style> blocks into scoped CSS sidecars and class maps without browser runtime helpers
support composing lowered .tsrx modules with Solid's function-level \"use server\" transform while preserving path-stable IDs
document current experimental constraints, including omitted native TSRX source maps until projection mappings can be represented accurately

Vite integration: solidjs/solid-vite-plugin#333

Test plan

pnpm --filter @solidjs/babel-plugin test
pnpm --filter @solidjs/compiler test
Rust tests with default, no-default, and TSRX-only feature configurations
Clippy with warnings denied across feature configurations
Babel/native TSRX output, runtime, lazy-binding, directive, and scoped-style oracle parity tests
Vite integration verified against both compiler backends

Release plan

Keep this PR in draft while the current Solid release is prepared. Rebase onto the post-release next branch and refresh the experimental parser pins before marking it ready.

Made with Cursor

.tsrx sources desugar TSRX constructs into the shared Solid JSX lowering in @solidjs/babel-plugin (via @tsrx/core) and @solidjs/compiler (via a pinned oxc-tsrx text projection), with byte-parity enforced by the fixture corpus and parity harness. Also fixes DOM insert markers to ride the following sibling's declared walk variable, matching Babel. Co-authored-by: Cursor <cursoragent@cursor.com>

Exercise Unicode spans, lexical traps, nested backend lowering, accessor scope, and early-error constraints so the shared corpus catches frontend drift. Rewrite lazy binding update targets in the native compiler to match the Babel frontend. Co-authored-by: Cursor <cursoragent@cursor.com>

Execute the same authored fixtures through Babel and Oxc against the real Solid DOM and SSR runtimes, asserting reactive updates, keyed identity, events, lazy writes, branches, and empty fallbacks independently of code-generation parity. Co-authored-by: Cursor <cursoragent@cursor.com>

Add full lazy destructuring semantics and close parser parity gaps so both frontends support expression containers, accessor-backed patterns, and lazy arrow parameters. Co-authored-by: Cursor <cursoragent@cursor.com>

Compile TSRX style blocks into parity-tested scoped CSS sidecars across Babel and native pipelines without runtime helpers. Co-authored-by: Cursor <cursoragent@cursor.com>

changeset-bot · 2026-08-28T04:33:20Z

🦋 Changeset detected

Latest commit: 66cce98

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

This PR includes changesets to release 11 packages

Name	Type
@solidjs/compiler	Major
@solidjs/babel-plugin	Major
test-integration	Patch
solid-js	Major
@solidjs/web	Major
@solidjs/html	Major
@solidjs/h	Major
@solidjs/universal	Major
@solidjs/element	Major
@solidjs/signals	Major
@solidjs/diagnostics	Major

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github-actions · 2026-08-28T04:35:31Z

size-limit report 📦

Path	Size
signals: core floor (createSignal/Memo/Effect/Root/flush)	7.59 KB (0%)
signals: + createStore	13.22 KB (0%)
signals: + isPending/latest	9.53 KB (0%)
app: render + one signal (the simple-app floor)	10.24 KB (0%)
app: hydrating (no stores) with Show/For/Loading/Errored/lazy	16.9 KB (0%)
app: hydrating + every store primitive family	24.33 KB (0%)
app: CSR with Show/For/Loading/Errored/lazy	12.34 KB (0%)
frames: eager client consumer (frames client + transport, lazy codec)	10.6 KB (0%)

coveralls · 2026-08-28T04:37:41Z

Coverage Report for CI Build 33159014288

Warning

Build has drifted: This PR's base is out of sync with its target branch, so coverage data may include unrelated changes.
Quick fix: rebase this PR. Learn more →

Coverage remained the same at 72.216%

Details

Coverage remained the same as the base build.
Patch coverage: No coverable lines changed in this PR.
No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

Coverage Stats


Relevant Lines:	996
Covered Lines:	767
Line Coverage:	77.01%
Relevant Branches:	782
Covered Branches:	517
Branch Coverage:	66.11%
Branches in Coverage %:	Yes
Coverage Strength:	14.64 hits per line

💛 - Coveralls

codspeed-hq · 2026-08-28T04:46:20Z

Merging this PR will not alter performance

✅ 136 untouched benchmarks
⏩ 132 skipped benchmarks¹

_{Comparing tsrx-frontend (66cce98) with next (f422bf7)}

132 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. ↩

Allow secondary compiler passes to retain the authored TSRX path so server-function IDs stay aligned with Vite's manifest. Co-authored-by: Cursor <cursoragent@cursor.com>

Scope selectors against known elements instead of allowing unrelated selectors whenever a dynamic child is present. Co-authored-by: Cursor <cursoragent@cursor.com>

Compose Oxc mappings through exact projection ranges while leaving generated scaffolding unmapped. Co-authored-by: Cursor <cursoragent@cursor.com>

socket-security · 2026-08-28T09:22:07Z

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/@tsrx/core@0.1.63

View full report

ryansolid and others added 5 commits August 25, 2026 16:09

Complete TSRX container and lazy binding support.

82868c6

Add full lazy destructuring semantics and close parser parity gaps so both frontends support expression containers, accessor-backed patterns, and lazy arrow parameters. Co-authored-by: Cursor <cursoragent@cursor.com>

Add scoped styles to TSRX frontends.

774aad5

Compile TSRX style blocks into parity-tested scoped CSS sidecars across Babel and native pipelines without runtime helpers. Co-authored-by: Cursor <cursoragent@cursor.com>

ryansolid and others added 2 commits August 27, 2026 22:25

Support server functions in lowered TSRX modules.

d9a10b8

Allow secondary compiler passes to retain the authored TSRX path so server-function IDs stay aligned with Vite's manifest. Co-authored-by: Cursor <cursoragent@cursor.com>

Fix TSRX style pruning around dynamic children.

ed9993f

Scope selectors against known elements instead of allowing unrelated selectors whenever a dynamic child is present. Co-authored-by: Cursor <cursoragent@cursor.com>

ryansolid mentioned this pull request Aug 28, 2026

Add experimental TSRX support solidjs/solid-vite-plugin#333

Draft

7 tasks

Add authored source maps for native TSRX.

66cce98

Compose Oxc mappings through exact projection ranges while leaving generated scaffolding unmapped. Co-authored-by: Cursor <cursoragent@cursor.com>

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Add experimental TSRX compiler frontends - #3086

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