solid-js@2.0.0-rc.8

Patch Changes

• 01ac18c: Compiler componentNames option: component owner labels that survive minification. With the flag on, DOM output carries the tag as written in source as a third createComponent argument — <Home /> compiles to createComponent(Home, props, "Home"), <Ui.Button /> to "Ui.Button", <this.Row /> to "this.Row" — and the dev and observe runtimes label the component's owner with it (<Home> in diagnostic ownerPaths, attribution chains, and the devtools _component.name), falling back to Comp.name as before. Until now an observe-tier production bundle reported hot scopes and holds under whatever the minifier left of the function name (<Xt> › <Kn>), and a lazy() or HMR wrapper hid the tag name even in dev. Off by default and byte-identical output when off; SSR (which inlines the call) and universal output never emit it; the production createComponent ignores the argument. Both compilers implement it in parity (shared fixtures, cross-mode ratchet). @solidjs/vite-plugin enables it for the dev and observe postures.

• 711b557: Move the #3338 diagnostics out of prod bytes. The lazy() "not preloaded" explanation and the document-root preload-failure framing are dev-only; prod keeps terse messages and, at a document root, hands the preload failure itself to reportError (no wrapper Error). The haltReactivity reportError hand-off is compacted.

• 7d985b6: Fix SSR XSS: strings yielded by flow-control memos rendered unescaped

  <Show when={s}>{s}</Show>, <For>{v => v}</For>, <Dynamic component={() => s} />,
  <Switch>/<Match>, boundary fallbacks and any component that returns a string through a
  memo rendered that string raw on the server. The server flow controls return memos for
  hydration-id alignment; escape() passed functions through by identity, and the resolver
  appended whatever they later produced without escaping.

  One rule now: escape(x) at a hole covers everything reachable from x — strings, array
  items, and what a function yields when the resolver calls it (a deferred-escape wrapper).
  Finished { t } nodes pass through. Loading escapes its content the way it already
  escaped its fallback. The compilers stop wrapping fragment / mixed component children in
  _$escape (they are values; escaping them too double-escaped through
  <Comp>{props.children}</Comp>), and a single-expression fragment at a hole keeps the
  hole's wrap. Live-hole tags ride the wrapper and $slot survives the array copy, so
  frames behave as before.

• fe3ab92: Make a failed lazy() hydration observable instead of a silently dead page (#3338):

  • The client's "was not preloaded before hydration" error no longer says to add a Loading boundary — none is required for root-level lazy(). It now names the actual cause: the server serialized no client entry for the module (check the server log for "Asset manifest returned no client assets for module"), or the hydration id namespaces are misaligned.
  • An uncaught error that halts the reactive system is handed to reportError where the platform provides it, so it reaches window.onerror / error monitoring. Creation-time throws (a lazy miss during the hydration render) are converted to status by ancestor recomputes and never reached the top; console.error was their only trace.
  • hydrate()'s "module preload failed → fall back to client render" path no longer runs for a document root, where a client render is impossible (the shell cannot be created) and died deep in the walk with an unrelated "Hydration Mismatch" as an unhandled rejection. It now reports an explicit error carrying the preload failure as its cause.

• 0961d97: Observe tier: first-class interaction records and a typed record channel.

  • attribution.interactions() and InteractionEvent: one record per withInteraction dispatch with at, handlerMs, writes, runs, created (computations built in its runs), runMs, the holds and navigations attached, and settledMs/outcome (idle | committed | held) once everything it caused is through.
  • attribution.subscribe(type, listener) for "rerun" | "interaction" | "hold" | "navigation", delivered synchronously as each record completes; the bare subscribe(listener) form is unchanged.
  • RerunEvent.at and HoldEvent.at — absolute times on the performance.now() clock beside the existing durations.
  • HoldEvent.acknowledgements replaces acknowledgedBy: one { kind, source, reader? } per affordance, reader the owner path of the effect that painted it. feedback().sources[].acknowledgedBy still ranks by kind:source. @solidjs/diagnostics artifact format version 4 (holds carry acknowledgements; assertion evidence likewise).
  • NavigationRef.params values may be undefined (an optional segment left unbound).
  • OBSERVE.exclude(owner) / OBSERVE.isExcluded(subject) — an observer rendering inside the app it watches marks its own subtree; diagnostics about it are suppressed and the engine records none of its runs.
  • solid-js re-exports the tier types from its root: InteractionRef, NavigationRef, OriginRef, DiagnosticEvent and friends, and the engine's record types (ChangeOrigin, RerunEvent, HoldEvent, NavigationEvent, InteractionEvent, …).

• 1807f7f: Observe tier: split dev-only checks from production-legal observability wiring.

  Breaking (pre-release): DEV.diagnostics moved to a new OBSERVE export
  — OBSERVE.diagnostics.{subscribe,capture,emit}, OBSERVE.subjectOf(event).
  DEV keeps the devtools surface (hooks, getChildren/getSignals/
  getParent/getSources/getObservers) and gains the console face
  (DEV.report, DEV.setConsoleFooter — formerly
  DEV.diagnostics.setConsoleFooter). Both are exported from @solidjs/signals
  and solid-js (client and server).

  Breaking (pre-release): the attribution engine is its own entry.
  DEV.attribution.enable() and friends are now
  import { attribution } from "solid-js/attribution" (or
  @solidjs/signals/attribution) — enable/disable/subscribe/history/why/ subscriptions/costs/waterfalls/holds/feedback/markFlight/format/formatOrigin,
  plus the record types (RerunEvent, ChangeRecord, ChangeOrigin,
  HoldEvent, …) which were previously unexported. The runtime keeps only the
  core's side as OBSERVE.attribution: install(hooks)/installed (the hook
  slot an engine — built-in or a devtools' own — installs into) and
  withInteraction(ref, fn) (the frame the web runtime opens around every event
  dispatch; fn() when no engine is installed). A build that never imports the
  engine never ships it: the observe tier costs ~1.3 KB brotli over prod on the
  CSR scenario, the engine 9.7 KB more when enabled. The import is legal in
  every tier — prod resolves an inert engine with the same surface.
  @solidjs/diagnostics requires OBSERVE and imports the engine itself; it now
  works against observe builds.

  New build tier. Every package with wiring ships <entry>.observe.{js,cjs}
  beside its prod and dev artifacts, selected by a new observe export condition
  (listed after development, so dev still wins when both are set): signals
  dist/observe/ + dist/node.observe.cjs (each with an attribution entry
  beside index; the flat dev/CJS builds are code-split so both entries share
  one module instance), solid-js solid.observe.* and
  server.observe.*, web web.observe.*, universal universal.observe.*.
  Observe builds keep attribution hook sites, owner labels (_name, flow-control
  memo names, component roots), graph edge counters and the diagnostics channel;
  they fold out strict-read checks, invariants, forbidden-scope guards, devtools
  brands and all console output. Entries without wiring (frames, server-functions,
  storage, h, html, element) fall through to prod under observe. Signals gates
  on __OBSERVE__ (dev implies observe; asserted at init), solid-js/web/universal
  on the "_SOLID_OBSERVE_" literal. Default prod artifacts are unchanged apart
  from the new OBSERVE = undefined export; _name is reserved from property
  mangling so the cross-package label survives in the observe tree.
  OBSERVE.diagnostics.emit accepts an explicit ownerPath for hosts whose
  owners are not signals' owners (the SSR runtime).

• a39415c: Breaking: all runtime packages are ESM only and declare engines.node >= 22.12.

  Every .cjs artifact, every require branch in the exports maps, and the types-cjs/ declaration mirrors are gone. Node 22.12+ loads ESM through require() natively, so a CommonJS host resolves the same files through the same export conditions it always did (browser, node, development, observe, …) — there is one module graph per tier rather than two to keep in step. main now points at the ESM server entry.

  For consumers:

  • ESM apps, Vite, Vitest, Bun, Deno, workers: no change.
  • CommonJS Node apps: require Node 22.12 or later. require("solid-js") keeps working.
  • TypeScript CommonJS projects: use module: "NodeNext" (TS 5.8+), which type-checks require() of ESM packages; module: "Node16" will report TS1479.
  • Jest: needs Node 22.12+ for require(esm); any preset that maps specifiers to .cjs paths (as solid-jest does for Solid 1.x) has nothing to map to and must be updated.

  @solidjs/signals drops its flat dist/node*.cjs builds; its ESM entries (dist/prod/, dist/observe/, dist/dev.js) are the only ones. @solidjs/babel-plugin and @solidjs/compiler (build-time tooling loaded by Babel/Node) are unchanged.

• 8cfa272: Require seroval and seroval-plugins ~1.6.7 (minor-locked, as before). Seroval 1.6 ships bundled declarations with no extensionless relative imports, so the @solidjs/web server-functions, serialization and frames type surfaces now type-check under module: NodeNext from a CommonJS project without skipLibCheck — the packaged-types check covers every public @solidjs/web specifier.

• 4e730a9: spread() reads a merge() proxy through its sources instead of through the proxy. A spread mixed with other attributes compiles to spread(el, merge(statics, () => rest)); going through the proxy cost merge's keys() (a Set plus an own-enumerable scan of every source) and then, per key, a right-to-left in walk of the sources, on every run. The spread now iterates the flattened sources directly — the union of own string keys, later sources overriding earlier, children/ref excluded — and enumerates each source through the same single-trap path as readShallow(). omit() is not a merge and stays opaque: it is enumerated through its own filtering trap. Own keys only, per source: a key an earlier source owns and a later source merely inherits resolves to the earlier source's value (the proxy's in walk saw the inherited one) — spread has always applied own properties only. @solidjs/signals gains an @internal mergeSources(). Guarded by the Tier-1 spread-enumerate bench (merge(static, reactive) row). readShallow() re-maps a class array element-wise instead of copy-on-write (−58 B brotli on web.js; className allocates for an array anyway, measured at parity).

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  • @solidjs/signals@2.0.0-rc.8