Read before a js eval cell that installs a package, spawns a server or PTY, or starts a long run, and before any bun -e, script, server, CLI, test, bundle, or package-management work: this session's eval js kernel runs Bun 1.4+ (this skill is present only when it does). Bun 1.4 ships builtins that replace 15+ npm deps — check here BEFORE installing sharp, puppeteer/playwright (scraping), marked, node-cron, node-pty, concurrently, serve-static, tar, json5, fast-xml-parser, string-width. Triggers: eval js, bun, Bun.serve, bun test, bun build, bun install, bun run, image resize, headless browser, markdown render, cron, PTY.
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Review the instructions the agent will receive before you install.
Bun 1.4 (2026) ships builtins that replace most utility npm packages. Before adding a dependency or writing a workaround, check the capability map below — if Bun ships it, use the builtin. This skill is loaded because this session's eval js kernel runs Bun >= 1.4; on other machines or pinned projects, confirm with bun --version ([v1.3.x]/[v1.4.0] tags in the references give exact minimums). Release post: https://bun.com/blog/bun-v1.4
| You want to... | Use | Replaces | Ref = references/<name>.md |
|---|---|---|---|
| Resize/convert/rotate images | Bun.file(p).image().resize().webp().write() | sharp | runtime-apis |
| Headless browser: navigate, click, screenshot, evaluate, CDP | new Bun.WebView() | puppeteer, playwright (scraping) | runtime-apis |
| Markdown → HTML / React / ANSI | Bun.markdown.html() / .react() / .render() | marked, react-markdown | runtime-apis |
| Schedule cron jobs | Bun.cron() | node-cron | runtime-apis |
| Drive a PTY (bash, vim, TUIs) from JS | Bun.spawn([...], { terminal }) | node-pty | runtime-apis |
| Run package scripts concurrently, glob-matched | bun run --parallel "build:*" | concurrently, npm-run-all | runtime-apis |
| Parse JSON5 / JSONL / JSONC / XML / TOML; tarballs | Bun.JSON5/.JSONL/.JSONC/.XML/.TOML, Bun.Archive | json5, ndjson, jsonc-parser, fast-xml-parser, @iarna/toml, tar | runtime-apis |
| ANSI-aware terminal text: width, slice, wrap | Bun.stringWidth(), Bun.sliceAnsi(), Bun.wrapAnsi() | string-width, slice-ansi, wrap-ansi | runtime-apis |
| Call C libraries 3x faster, plain strings back | bun:ffi (buffer_length, cstring) | — | runtime-apis |
| Serve a static dir (ETag/Range/304 handled) | Bun.serve({ routes: { "/x/*": { dir } } }) | express.static, serve-static, sirv | http-networking |
HTTP/3 server; fetch protocol/compress/proxy | http3: true, fetch(url, { protocol, compress, proxy }) | — | http-networking |
| Tests across CPU workers / CI shards / changed files / flaky retry | bun test --parallel --shard=1/3 --changed=main --retry | jest/vitest infra | test |
| Kill "passes alone, fails in suite" bugs | bun test --isolate | vitest default behavior | test |
| React Compiler auto-memoization | bun build --react-compiler | babel-plugin-react-compiler | build |
| Embed assets/dirs into a single-file executable | bun build --compile --asset ./public | pkg hacks | build |
| Compile-time feature flags, in-memory bundling, metafile | bun:bundle feature(), files:{}, metafile: true | esbuild define/plugins | build |
| Diff package versions, fix vulns, dedupe/prune, license audit | bun pm diff, bun audit fix, bun dedupe, bun prune, bun pm licenses | npm-diff, npm audit fix | install |
| 7x faster CI installs (global virtual store) | linker = "isolated" in bunfig.toml | pnpm store | install |
| Profile CPU/heap/bundle as grep-able Markdown | bun --cpu-prof-md, --heap-prof-md, bun build --metafile-md | Chrome DevTools round-trip | dev-tooling |
| Native REPL; render Markdown in terminal | bun repl, bun ./README.md | node repl, glow | runtime-apis |
| Run Playwright, vitest, Next.js 16, OpenTelemetry, dd-trace | they now just work | Node.js | node-compat-platforms |
Free wins (no code change): 2x lower CPU, 13-48% less server memory, 2-2.5x faster startup — full numbers in performance.
eval js kernel runs on Bun (that is why this skill is present): call Bun.* APIs directly inside js cells. Reach for bash or a spawned bun <file> / bun -e only for CLI surfaces (bun test, bun build, bun pm) or work that needs a separate process.Bun.markdown HTML is unsanitized, HTTP/3 is experimental) live there, not here..xml/.css import semantics, Bun.$ globbing, fetch header combining, and WebSocket close timing all changed.fetch, tls.connect, Bun.connect, RedisClient. See security before loosening anything.No reviews yet. Tell others what you thought.
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Implements a single feature in the pi-mono `todotools` builtin extension work. Use for refactoring, continuation runtime, config resolver, prompt builder, test authoring, golden snapshots, CHANGELOG entries, and harness helpers. Does NOT do manual tmux QA.
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Example skill loaded from resources_discover
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MUST read before generating images. Prompt-crafting guide for gpt-image-2.5 covering tool routing (native image_generation server tool vs the generate_image tool), model and quality selection, prompt structure, exact text rendering, reference-image editing, transparent assets, output formats, and multi-turn refinement.
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Sync a fork branch with an upstream remote using a history-preserving merge. Use this whenever the user says /merge-upstream, merge upstream, sync upstream, sync fork, or wants upstream changes integrated without rebasing or force-pushing.
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Release, publish, CalVer tag push, npm publish, 배포, 릴리즈 for senpi. Use for the canonical release flow, GitHub tag/release publication, and npm publishing.
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Manual QA harness for the senpi coding agent itself. MUST USE after changing packages/ai, packages/agent, packages/coding-agent, or packages/tui — a green typecheck and `npm test` are NOT QA. Drives the real CLI from source in an isolated sandbox (never touches ~/.senpi or real credentials) across four channels: remote RPC (--mode rpc JSONL stdio), TUI smoke (node-pty on Windows, tmux on POSIX), mock loop (a local fake model server for deterministic, zero-token agent-loop runs), and CLI smoke (--help/--print/--list-models). Every helper ships a --self-test. Use whenever someone says qa senpi, test the agent, verify my change, rpc qa, tui qa, mock-loop qa, smoke the cli, or needs evidence that an agent-loop, tool, keybinding, or provider change works end to end. Capture evidence to local-ignore/qa-evidence/.
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