Changelog

v0.3.0 - Production Hardening & Performance Optimization

Reactive engine nuclear optimization:

Dirty tracking: Uint8Array[65536] bitmap replaces Uint8Array[8192] — covers virtually all apps, eliminates Set fallback for IDs >= 8192
Batch draining: buffer-swap instead of copy+clear — swap two pointers instead of copying 65536 bytes per drain
Snapshot buffer: inline _snapBuf (Uint32Array) replaces .slice() — zero allocation on every effect flush
Dep array pooling: _depPool reuses number[] arrays — avoids GC pressure during effect re-creation
Running effects bitmap: Uint8Array[65536] replaces Set<number> — zero hash overhead for deduplication
Effect generation tracking: Int32Array replaces regular array

Before → After (measured):

Benchmark	Before	After	Improvement
`signal.set()` x100K (no effects)	5.1M ops/s	9.3M ops/s	1.8x
`set() + 1 effect` x100K	0.4M ops/s	1.5M ops/s	3.8x
`3 computed chain` x100K	0.1M ops/s	0.5M ops/s	5x
`batch(3000)` x100	5.4M ops/s	15.3M ops/s	2.8x
Viewport batching	27K/s	64K/s	2.4x
Signal creation	281/ms	1443/ms	5.1x
10K signals bitmap	18.5ms	8.0ms	57% faster
`computed()` read	5.4M/s	41.2M/s	7.6x

Event handler storage: flat string[] indexed by event type position replaces nested Map<Function, string> per type
Pre-allocated handler arrays with growing strategy — no per-registration allocation
Dynamic bubble path array (64 → 1024 max element types) — no fixed upper bound
removeAllEventListeners() for full cleanup

Compiler expression validation (codegen.ts): blocks require(), eval(), Function(), __proto__, process, import() — rejects at compile time with clear error
SSR HTML escaping (ssr.ts): &, <, >, ", ' escaped — prevents XSS in server-rendered markup

vnode.ts: VNodeProps typed as Record<string, string | number | boolean | ((e: Event) => void) | undefined>
mount.ts: _applyProps() helper — no more (el as any)[key]
patch.ts: Uses typed _applyProps(), fully typed
reconcile.ts: Generic ReconcileItem<T>, indexed loops instead of Map.forEach
parse.ts: attributes typed as Record<string, string | boolean>
compiler/ssa.ts: Instruction.args typed as (string | number | boolean)[] instead of any[]
signal.ts: All internal buffers typed (Uint8Array, Uint32Array, Int32Array)

codegen.ts: configurable stateImportPath and functionName options
codegen.ts: fixed identifier collector regex (was false-positiving on property chains)
optimize.ts: real constant folding — arithmetic on numeric literals, boolean/string literals, adjacent text merging
vite-plugin.ts: proper error handling

signal(): returns Signal<T> object with .set(), .update(), .subscribe() — .set() returns boolean (whether effect was scheduled)
EffectScope: effect() returns { dispose() } API
Bounds checking on signal/effect IDs with dev-mode warnings (warn once per threshold)
getSignalCount() / getEffectCount() introspection
batch() synchronous execution — runs fn inline, flushes after

Test File	Tests	Coverage
`signal.test.ts`	21	Read/write, effects, computed, batch, subscribe, dispose, multiple subscribers
`optimize.test.ts`	9	Dead code, constant folding, unused declarations
`pipeline.test.ts`	21	SSA, codegen, full pipeline, security validation, error handling
`perf.test.ts`	18	Time-based benchmarks: signal I/O, effects, computed, batch, memory/GC, extreme scale, dedup
`compiler.test.ts`	21	Parse, SSA, optimize, codegen, vite plugin
`stress-grid.test.ts`	35	Integration: DOM rendering, viewport updates, batch correctness
`ssr.test.ts`	9	Server rendering, hydration markers, HTML escaping
`events.test.ts`	6	Delegation, bubbling, capture, one-shot, dynamic elements
`reconcile.test.ts`	6	Diffing, keyed, children, typed interface
`patch.test.ts`	8	Props, events, styles, conditional
`vnode.test.ts`	6	Element/text/comment creation, props, children
`mount.test.ts`	6	Mount, props, events, children, namespace
`pool.test.ts`	8	Reuse, pre-allocation, return, type filtering
`core-benchmark.test.ts`	9	Stress grid benchmarks (3000 signals, viewport, fan-out, bitmap)

packages/core/package.json: npm-publishable config — exports, types, files, sideEffects, keywords, MIT license
.gitignore: comprehensive — generated/ dirs, IDE, coverage, artifacts
.github/workflows/ci.yml: lint → test → build pipeline
tsconfig.base.json + stress-grid/tsconfig.json: shared base config
Root package.json: clean/typecheck/lint scripts
Removed nul artifact files

pixel-canvas/state.ts: timer cleanup (startRandomPaint/stopRandomPaint), fixed _drawAt type casting
ralph-loop/state.ts: responsive dimensions — uses getWidth()/getHeight() functions
events.ts: cleanup of bubble path entries after traversal