HyperEmitter (planning scaffold)

This package placeholder exists to host the benchmarking + DX scaffolding for the upcoming HyperEmitter implementation. The real emitter code will land later; for now we capture performance baselines for competitor libraries and set up build/CI expectations.

Baseline benchmarks

Run competitor baselines (Node EventEmitter, eventemitter2/3, emittery, mitt, tseep):

pnpm --filter @open-wa/hyperemitter bench:baseline

Options:

• --iterations <n> to adjust emit count (default: 500000)
• --output <file> to override output path
• --ci to suppress console tables

Outputs JSON to packages/hyperemitter/benchmarks/baseline/results/baseline-node-<version>.json.

If some competitors are not installed, the runner will skip them and record the reason. Install this package’s devDeps to populate all baselines.

Build/interop contract (snapshot)

• Dual ESM/CJS outputs with typed entrypoints.
• Adapters for EventTarget, Node EventEmitter, and worker threads.
• Optional plugins (TTL/maxListeners/tracing) kept out of the hot path.
• Perf budgets enforced via CI once HyperEmitter lands (5% envelope vs tseep for exact; ≥10x EE2 for wildcards).