feat(compiler,babel-plugin,solid): componentNames flag — component owner labels that survive minification

[ryansolid]

Summary

Compiler flag componentNames (off by default): DOM output carries the tag as written in source as a third createComponent argument, and the dev/observe runtimes label the component's owner with it. Observe-tier production bundles currently report hot scopes and holds under whatever the minifier left of the function name; with the flag, the same ownerPath reads by component.

Before (minified observe build, Sentry adapter spike):

<o> › <r> › computed › <mc> › <children> › <pq> › computed › <hc> › computed › <ro> › value › <r> › computed › <IK>

After:

<Router> › <RouterContextObj> › computed › <Root> › <RootComp> › <Layout> › computed › <Routes> › computed › <Show> › value › <RouteContextObj> › computed › <RK> › <For> › <For>

(<RK> is the route component the router invokes by value — createComponent(route.component, props) — so no tag exists to name it from; that's a router-side call.)

Compilers (@solidjs/babel-plugin, @solidjs/compiler)

• componentNames: boolean, default false. <Home /> → createComponent(Home, props, "Home"); <Ui.Button /> → "Ui.Button"; <For> → "For" (the source name, not the _$For alias); <this.Row /> → "this.Row" (both compilers rewrite this to _self$ before component lowering — Babel tracks the rewritten identifiers in a WeakSet, Rust checks the span's source text).
• DOM output only. SSR keeps inlining Comp(props); universal/dynamic never emit (the renderer owns a two-argument createComponent).
• Off → byte-identical output.
• Parity: shared fixture dir (__dom_component_names_fixtures__, including a generate: "ssr" case proving inertness), a dom-component-names mode in the parity harness so the cross-mode ratchet compiles every existing fixture through the flag too (zero divergences, no expectation files), and the harness now honors per-fixture options.json the way Babel's runner does.

Runtime (solid-js)

• createComponent(Comp, props, name?). observedComponent labels the owner <${name || Comp.name || "Anonymous"}> and uses the resolved name for the devtools _component.name (anonymous stays ""). Prod ignores the argument. Size scenarios within limits.

Integration

@solidjs/vite-plugin turns the flag on for the dev posture and a new observe posture (solidjs/vite-plugin PR follows; it needs the compiler release that carries the option).

Tests

babel-plugin 257, compiler 5741, solid 595, web 725 — green. scripts/size scenarios all within limits.

Co-authored with Claude via Cursor.

[changeset-bot]

🦋 Changeset detected

Latest commit: adc5cd1

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

This PR includes changesets to release 11 packages

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

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[coveralls]

Coverage Report for CI Build 34518563542

Coverage increased (+0.02%) to 71.842%

Details

• Coverage increased (+0.02%) from the base build.
• Patch coverage: 3 of 3 lines across 2 files are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	1007
Covered Lines:	772
Line Coverage:	76.66%
Relevant Branches:	790
Covered Branches:	519
Branch Coverage:	65.7%
Branches in Coverage %:	Yes
Coverage Strength:	15.01 hits per line

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💛 - Coveralls

[codspeed-hq]

Merging this PR will not alter performance

✅ 151 untouched benchmarks

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_{Comparing observe-component-names (adc5cd1) with next (51c201f)}