[ryansolid]

Before: the store family's private fields (fam on a store target, and overlaid, asked, woke, shallow on the family) had plain names, so the minifier kept them in full in every store bundle.

After: they are _fam, _overlaid, _asked, _woke and _shallow, which the build mangles. Store bundles lose 65 to 150 B minified. There is no behaviour, type or public API change.

How: a rename across packages/signals/src (store/*, affects-marks.ts, deferred.ts, core/async.ts, core/seat.ts, core/verdict.ts) and two store tests. Nothing outside packages/signals reads these fields. live, node, st, opt, key, map and run stay unprefixed: they are read in core-side files, and prefixing them pushed hot core fields (_fn, _verdictLane, _gated) off one-character names, which grew every non-store bundle. The build pinned the five new names in packages/signals/scripts/mangle-props.json at the next free short names (#4503); every existing pin keeps its name.

Size vs next @ 4a4803c, measured locally (linux), brotli / minified:

scenario	brotli	minified
hello world (app: compiled floor)	−9 (9,971 B)	−2
signals: core floor	−3	−2
signals: + createStore	+41	−65
signals: + isPending/latest	−12	−4
signals: + until/refresh	−2	−2
app: render + one signal	−31	−2
app: hydrating (no stores)	−39	−2
app: hydrating + every store primitive family	−64	−150
app: CSR	−2	−2
app: CSR, observe tier	+27	−2
app: CSR, observe tier + attribution	+18	−2
app: compiled CSR	−19	−67
app: compiled hydrating	−8	−67
page: base server components	−58	−5
page: live server components	+23	−7
page: compiled base server components	−17	−5
page: compiled live server components	−8	−7
page: base + router	+41	−5
page: live + router	−12	−7
frames, server floor, renderToString	0	0

Minified drops in every changed scenario, and brotli falls by 134 B across the table. The five brotli rises all come with a minified drop: they are mangle-layout noise from _fam, which core files read (core/async.ts, core/verdict.ts), so even bundles without stores change by two bytes there. Leaving fam unprefixed zeroes four of them (one +13 appears on app: compiled CSR) but gives up most of the store savings: −16 instead of −65 minified on createStore, and 75 B less brotli saved overall. Three rows sit a few bytes over their brotli cap (observe tier +7, observe tier + attribution +2, live server components +5) but within 20 B of their recorded minified, so the gate passes. This PR changes no caps or records.

How did you test this change?

suite (after merging next @ 4a4803c)	passed	expected fail
signals	6,164	21
solid	918	0
web	1,599	7
web hydrate	716	10
web server	1,910	3

The one web server failure, server-functions-adapter-request.spec.tsx "keeps a rebuild failure's own error…", fails on plain next in the same environment. pnpm --filter @solidjs/web test-types and the signals src typecheck are clean.

The earlier red job run failed async-gen/store-unread-derive-e3.spec.ts ("an unread store's derive does not hold a plain write"): core/verdict.ts still read a derive's family as .fam, so the no-reader skip never fired. It now reads ._fam, and that spec passes.

🤖 Generated with Claude Code

https://claude.ai/code/session_015hPxMkC3jg3Uivh65gvaf2

[changeset-bot]

🦋 Changeset detected

Latest commit: 1752f8d

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

This PR includes changesets to release 15 packages

Name	Type
@solidjs/signals	Patch
test-integration	Patch
@solidjs/web	Patch
@solidjs/babel-plugin	Patch
@solidjs/compiler	Patch
@solidjs/diagnostics	Patch
@solidjs/element	Patch
@solidjs/h	Patch
@solidjs/html	Patch
solid-js	Patch
@solidjs/universal	Patch
board-example	Patch
canvas-example	Patch
server-dbmon-example	Patch
todos-server-example	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

[github-actions]

Size (brotli, eager entry chunk)

scenario	head	vs base	minified vs base	minified vs recorded	cap		lazy chunks (not counted)
signals: core floor (createSignal/Memo/Effect/Root/flush)	7.41 KB	−3 B (−0.0%)	−2 B	−5 B	7.43 KB	✅
signals: + createStore	14.96 KB	+41 B (+0.3%)	−65 B	−65 B	14.99 KB	✅
signals: + isPending/latest	11.37 KB	−12 B (−0.1%)	−4 B	−4 B	11.40 KB	✅
signals: + until/refresh (truth readers, no optimism)	8.04 KB	−2 B (−0.0%)	−2 B	−3 B	8.06 KB	✅
app: render + one signal (the simple-app floor)	9.76 KB	−31 B (−0.3%)	−2 B	−5 B	9.80 KB	✅
app: hydrating (no stores) with Show/For/Loading/Errored/lazy	18.74 KB	−39 B (−0.2%)	−2 B	−2 B	18.80 KB	✅	lazy-page.js 0.04 KB
app: hydrating + every store primitive family	32.47 KB	−64 B (−0.2%)	−150 B	−142 B	32.51 KB	✅	lazy-page.js 0.04 KB
app: CSR with Show/For/Loading/Errored/lazy	13.43 KB	−2 B (−0.0%)	−2 B	+11 B	13.47 KB	✅	lazy-page.js 0.04 KB
app: CSR, observe tier (same app on the observe artifacts)	15.21 KB	+27 B (+0.2%)	−2 B	+11 B	15.20 KB	⚠️ over by 7 B, 9 B minified headroom	lazy-page.js 0.04 KB
app: CSR, observe tier + attribution engine enabled	29.80 KB	+18 B (+0.1%)	−2 B	−2 B	29.80 KB	⚠️ over by 2 B, 22 B minified headroom	lazy-page.js 0.04 KB
app: compiled floor (one template, one text hole, one delegated click)	9.97 KB	−9 B (−0.1%)	−2 B	−3 B	9.98 KB	✅
app: compiled CSR (JSX todo app: spread/merge/omit, events, class/style, keyed For, Show, Loading + lazy, store)	26.29 KB	−19 B (−0.1%)	−67 B	−67 B	26.36 KB	✅	stats.js 0.18 KB
app: compiled hydrating (the same JSX todo app through hydrate(), compiled hydratable)	32.53 KB	−8 B (−0.0%)	−67 B	−67 B	32.56 KB	✅	stats.js 0.20 KB
frames: eager client consumer (frames client + transport, lazy codec)	11.75 KB	0 B	0 B	0 B	11.77 KB	✅
page: base server components (hydrating + dynamic + frames + sf reference)	33.69 KB	−58 B (−0.2%)	−5 B	−5 B	33.81 KB	✅	assets.js 0.78 KB, decode.js 7.09 KB, lazy-page.js 0.04 KB, regions.js 1.06 KB, trace.js 9.18 KB, wire.js 3.47 KB
page: live server components (base + live/GET + action + isPending/latest)	39.10 KB	+23 B (+0.1%)	−7 B	+9 B	39.10 KB	⚠️ over by 5 B, 11 B minified headroom	assets.js 0.78 KB, decode.js 7.09 KB, lazy-page.js 0.04 KB, regions.js 1.06 KB, trace.js 9.20 KB, wire.js 3.47 KB
page: compiled base server components (the base page as JSX: templates with class/style/attributes/events, For/Show; no spread)	35.71 KB	−17 B (−0.0%)	−5 B	−5 B	35.74 KB	✅	assets.js 0.78 KB, decode.js 7.09 KB, regions.js 1.06 KB, sc-comments.js 0.20 KB, trace.js 9.14 KB, wire.js 3.47 KB
page: compiled live server components (the compiled base page + live/GET + action + isPending/latest)	43.04 KB	−8 B (−0.0%)	−7 B	−7 B	43.06 KB	✅	eager (counted): web.js 23.00 KB; assets.js 0.78 KB, decode.js 7.09 KB, regions.js 1.07 KB, sc-comments.js 0.19 KB, trace.js 9.21 KB, wire.js 3.47 KB
page: base + router (base page + @solidjs/router: createRouter, two routes, preload, useNavigate)	41.25 KB	+41 B (+0.1%)	−5 B	−30 B	41.25 KB	✅	assets.js 0.78 KB, decode.js 7.09 KB, lazy-page.js 0.04 KB, regions.js 1.07 KB, server.js 1.03 KB, serverForms.js 3.58 KB, trace.js 9.13 KB, wire.js 3.48 KB
page: live + router (live page + @solidjs/router: createRouter, two routes, preload, useNavigate)	48.67 KB	−12 B (−0.0%)	−7 B	−7 B	48.69 KB	✅	eager (counted): client.js 28.15 KB; assets.js 0.78 KB, decode.js 7.09 KB, lazy-page.js 0.04 KB, regions.js 1.07 KB, server.js 1.03 KB, serverForms.js 3.30 KB, trace.js 9.11 KB, wire.js 3.49 KB
server: floor (getRequestEvent + isServer)	1.27 KB	0 B	0 B	0 B	1.29 KB	✅
server: renderToString (the server-render floor)	22.85 KB	0 B	0 B	0 B	22.87 KB	✅

⚠️ Over the brotli cap within the minified allowance (passes)

• app: CSR, observe tier (same app on the observe artifacts): over brotli cap by 7 B; minified 41,993 B vs 41,982 B recorded with the cap (+11 B) — 9 B of the 20 B minified allowance left; −2 B minified over this PR's base
• app: CSR, observe tier + attribution engine enabled: over brotli cap by 2 B; minified 88,327 B vs 88,329 B recorded with the cap (−2 B) — 22 B of the 20 B minified allowance left; −2 B minified over this PR's base
• page: live server components (base + live/GET + action + isPending/latest): over brotli cap by 5 B; minified 118,132 B vs 118,123 B recorded with the cap (+9 B) — 11 B of the 20 B minified allowance left; −7 B minified over this PR's base

_{Bundled with Rolldown (what Vite ships), brotli q11, decimal KB. A scenario fails only when it is over its brotli cap and its minified size is more than 20 B over the minified recorded with the cap; over the cap within that allowance is brotli layout noise and passes with a warning. Caps and their recorded minified in scripts/size/scenarios.js; the floor and page caps in floor-caps.json are frozen (lower only, or Size-Exception: in the PR body). npm run ratchet lowers caps per RC; it never raises one (scripts/size/README.md).}

[codspeed]

Merging this PR will not alter performance

1 warning

⚠️ 4 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

✅ 200 untouched benchmarks
⏩ 5 skipped benchmarks¹

---

_{Comparing claude/project-thread-x1ore2-famrename (1752f8d) with next (322fa07)}

Footnotes

1. 5 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. ↩

[coveralls]

Coverage Report for CI Build 41185182826

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Coverage remained the same at 78.134%

Details

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

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Coverage Stats

Relevant Lines:	1367
Covered Lines:	1129
Line Coverage:	82.59%
Relevant Branches:	1098
Covered Branches:	797
Branch Coverage:	72.59%
Branches in Coverage %:	Yes
Coverage Strength:	29.82 hits per line

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