{"slug":"mturac-bun-runtime","name":"bun-runtime","description":"Bun as runtime, package manager, bundler, and test runner. When to choose Bun vs Node, migration notes, and Vercel support.","long_description":"---\nname: bun-runtime\ndescription: Bun as runtime, package manager, bundler, and test runner. When to choose Bun vs Node, migration notes, and Vercel support.\n---\n\n# Bun Runtime\n\nBun is a fast all-in-one JavaScript runtime and toolkit: runtime, package manager, bundler, and test runner.\n\n## When to Use\n\n- **Prefer Bun** for: new JS/TS projects, scripts where install/run speed matters, Vercel deployments with Bun runtime, and when you want a single toolchain (run + install + test + build).\n- **Prefer Node** for: maximum ecosystem compatibility, legacy tooling that assumes Node, or when a dependency has known Bun issues.\n\nUse when: adopting Bun, migrating from Node, writing or debugging Bun scripts/tests, or configuring Bun on Vercel or other platforms.\n\n## How It Works\n\n- **Runtime**: Drop-in Node-compatible runtime (built on JavaScriptCore, implemented in Zig).\n- **Package manager**: `bun install` is significantly faster than npm/yarn. Lockfile is `bun.lock` (text) by default in current Bun; older versions used `bun.lockb` (binary).\n- **Bundler**: Built-in bundler and transpiler for apps and libraries.\n- **Test runner**: Built-in `bun test` with Jest-like API.\n\n**Migration from Node**: Replace `node script.js` with `bun run script.js` or `bun script.js`. Run `bun install` in place of `npm install`; most packages work. Use `bun run` for npm scripts; `bun x` for npx-style one-off runs. Node built-ins are supported; prefer Bun APIs where they exist for better performance.\n\n**Vercel**: Set runtime to Bun in project settings. Build: `bun run build` or `bun build ./src/index.ts --outdir=dist`. Install: `bun install --frozen-lockfile` for reproducible deploys.\n\n## Examples\n\n### Run and install\n\n```bash\n# Install dependencies (creates/updates bun.lock or bun.lockb)\nbun install\n\n# Run a script or file\nbun run dev\nbun run src/index.ts\nbun src/index.ts\n```\n\n### Scripts and env\n\n```bash\nbun run --env-file=.env dev\nFOO=bar bun run script.ts\n```\n\n### Testing\n\n```bash\nbun test\nbun test --watch\n```\n\n```typescript\n// test/example.test.ts\nimport { expect, test } from \"bun:test\";\n\ntest(\"add\", () => {\n  expect(1 + 2).toBe(3);\n});\n```\n\n### Runtime API\n\n```typescript\nconst file = Bun.file(\"package.json\");\nconst json = await file.json();\n\nBun.serve({\n  port: 3000,\n  fetch(req) {\n    return new Response(\"Hello\");\n  },\n});\n```\n\n## Best Practices\n\n- Commit the lockfile (`bun.lock` or `bun.lockb`) for reproducible installs.\n- Prefer `bun run` for scripts. For TypeScript, Bun runs `.ts` natively.\n- Keep dependencies up to date; Bun and the ecosystem evolve quickly.\n","tagline":"Bun as runtime, package manager, bundler, and test runner. When to choose Bun vs Node, migration notes, and Vercel support.","category":"coding-agents","tags":["agent-skill"],"author":"mturac","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"github candidate review","sourceDetail":"mturac/everything-openai-codex","creatorName":"mturac","creatorUrl":"https://github.com/mturac","sourceUrl":"https://github.com/mturac/everything-openai-codex/tree/main/.agents/skills/bun-runtime","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/mturac-bun-runtime#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. 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issue activity unavailable in current metadata","Dependency/runtime risk: command execution surface, credential or environment access","Permission surface: secrets or environment access, shell or command execution"]},"quality_signals":{"model":"v2","star_score":13.68,"usage_score":0,"review_score":5.7,"metadata_score":3,"freshness_score":15},"platforms":["Claude Code"],"use_cases":[{"slug":"coding-agents","title":"Coding agents","url":"https://www.openagentskill.com/use-cases/coding-agents"},{"slug":"testing-qa","title":"Testing and QA","url":"https://www.openagentskill.com/use-cases/testing-qa"},{"slug":"browser-automation","title":"Browser automation","url":"https://www.openagentskill.com/use-cases/browser-automation"},{"slug":"github-automation","title":"GitHub automation","url":"https://www.openagentskill.com/use-cases/github-automation"}],"stacks":[{"slug":"coding-review-agent","title":"Coding review agent","url":"https://www.openagentskill.com/collections/coding-review-agent"},{"slug":"browser-qa-agent","title":"Browser QA agent","url":"https://www.openagentskill.com/collections/browser-qa-agent"},{"slug":"frontend-product-ui","title":"Frontend and UI","url":"https://www.openagentskill.com/collections/frontend-product-ui"}],"install":"npx skills add mturac/everything-openai-codex --skill bun-runtime","install_targets":[{"id":"openagentskill-cli","label":"CLI","title":"OpenAgentSkill CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.3.0/openagentskill-0.3.0.tgz add mturac-bun-runtime","description":"Resolve policy, run the source installer safely, and report a verified install receipt.","copyLabel":"Copy command"},{"id":"codex","label":"Codex","title":"Codex install prompt","kind":"agent-prompt","value":"Install the \"bun-runtime\" agent skill from https://github.com/mturac/everything-openai-codex/tree/main/.agents/skills/bun-runtime. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Bun as runtime, package manager, bundler, and test runner. When to choose Bun vs Node, migration notes, and Vercel support. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"mturac-bun-runtime\",\"task\":\"Install bun-runtime\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Give Codex a repo-aware install prompt when the skill is not available through a local CLI.","copyLabel":"Copy prompt"},{"id":"claude-code","label":"Claude Code","title":"Claude Code skill prompt","kind":"agent-prompt","value":"Add \"bun-runtime\" as a Claude Code skill from https://github.com/mturac/everything-openai-codex/tree/main/.agents/skills/bun-runtime. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Bun as runtime, package manager, bundler, and test runner. When to choose Bun vs Node, migration notes, and Vercel support. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"mturac-bun-runtime\",\"task\":\"Install bun-runtime\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this prompt to ask Claude Code to add the skill and explain the local activation steps.","copyLabel":"Copy prompt"},{"id":"cursor","label":"Cursor","title":"Cursor rule prompt","kind":"agent-prompt","value":"Turn \"bun-runtime\" from https://github.com/mturac/everything-openai-codex/tree/main/.agents/skills/bun-runtime into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Bun as runtime, package manager, bundler, and test runner. When to choose Bun vs Node, migration notes, and Vercel support. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"mturac-bun-runtime\",\"task\":\"Install bun-runtime\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this when installing as Cursor project rules or reusable agent instructions.","copyLabel":"Copy prompt"}],"repository":"https://github.com/mturac/everything-openai-codex/tree/main/.agents/skills/bun-runtime","github_repo":"mturac/everything-openai-codex","version":"1.0.0","license":"MIT","urls":{"web":"https://www.openagentskill.com/skills/mturac-bun-runtime","repository":"https://github.com/mturac/everything-openai-codex/tree/main/.agents/skills/bun-runtime","api":"/api/agent/skills/mturac-bun-runtime","install_api":"/api/skills/mturac-bun-runtime/install"},"meta":{"created_at":"2026-09-07T11:10:33.671806+00:00","updated_at":"2026-09-07T11:10:33.8556+00:00","agent_friendly":true}}