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.
インストールする前に、エージェントに与えられる指示の中身を確認できます。
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.まだレビューはありません。使ってみた感想をお寄せください。
概要と使いどころ
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.
日本語の概要は準備中です。原文の説明を表示しています。
Example skill loaded from resources_discover
日本語の概要は準備中です。原文の説明を表示しています。
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.
日本語の概要は準備中です。原文の説明を表示しています。
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.
日本語の概要は準備中です。原文の説明を表示しています。
Release, publish, CalVer tag push, npm publish, 배포, 릴리즈 for senpi. Use for the canonical release flow, GitHub tag/release publication, and npm publishing.
日本語の概要は準備中です。原文の説明を表示しています。
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/.
日本語の概要は準備中です。原文の説明を表示しています。