hjemmesidekongen/nodejs-patterns
plugins/smedjen/skills/nodejs-patterns/SKILL.md
Node.js streams, worker threads, event loop, error handling, and clustering patterns. Covers when to use streams vs buffers, CPU-bound offloading decisions, async error propagation, and graceful shutdown.
testing
Updated Apr 5, 2026
$ install --global
skillsauthnpx skillsauth add hjemmesidekongen/ai nodejs-patternsInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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TrivyContainer and dependency vulnerability scanner
95%
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Last scanned: Apr 5, 2026, 5:29 PM21.6s3 files scanned
SKILL.md
- name:
- nodejs-patterns
- description:
- >
- user_invocable:
- false
- interactive:
- false
- model_tier:
- senior
- depends_on:
- []
- reads:
- []
- writes:
- []
- type:
- data_validation
- - name:
- graceful_shutdown_wired
- verify:
- SIGTERM and SIGINT handlers close servers and drain connections before exit
- fail_action:
- Add signal handlers that call server.close() and flush pending work
- on_fail:
- Node.js structure has reliability or performance gaps — address before merging
- on_pass:
- Node.js patterns are sound
- origin:
- smedjen
- inspired_by:
- original
- ported_date:
- 2026-03-10
- iteration:
- 2
- changes:
- Replaced known fundamentals with Node 22+ features, AbortController patterns, and diagnostic channels
nodejs-patterns
Beyond standard event loop and streams — Node 22+ features, structured cancellation, diagnostic channels, and ESM migration.
Node 22+ Features
Built-in test runner (node:test): describe, it, mock — no framework. node --test **/*.test.js + --experimental-test-coverage.
--env-file: node --env-file=.env server.js — no dotenv. Multiple files supported (last wins).
Watch mode: node --watch server.js replaces nodemon. Scope: --watch-path=./src.
Native fetch: Stable in 21+, undici-backed. Supports AbortSignal natively.
require(esm) (22.12+): require() of ES modules without flags. CJS consumers, ESM libraries.
AbortController Patterns
Propagate signals through async chains — fetch, setTimeout (node:timers/promises), and pipeline all accept { signal }. AbortSignal.timeout(5000) auto-aborts. AbortSignal.any([userSignal, timeoutSignal]) for composite cancellation.
Diagnostic Channels
node:diagnostics_channel — zero-overhead instrumentation, no APM coupling. dc.channel('app:db-query').publish({ query, duration }). Subscribers attach externally — app code never imports the observer. Undici publishes on undici:request:create for HTTP telemetry without middleware.
Custom Transform Streams
pipeline() + Transform with automatic backpressure:
const jsonLines = new Transform({
objectMode: true,
transform(chunk, enc, cb) { cb(null, JSON.stringify(chunk) + '\n'); }
});
await pipelinePromise(dataSource, jsonLines, response);
ESM Migration Decision
Stay CJS: consumers use require(), tooling assumes CJS, migration cost > benefit.
Go ESM: shipping a library, top-level await, Node 20+.
Dual publish: "type": "module" + "exports" with "import"/"require" conditions. Build CJS from ESM.
See references/process.md for worker thread pools, cluster, child processes, memory management, and anti-patterns.
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