Bun の使い方：インストール、bun init、bun add、npm との run 対照

公式インストール後、init/add/run で dev スクリプトを通し npm と対照。

初めてリポジトリで Bun を使うとき、bun init・bun add・bun run の役割と npm / Node との対応が分からず止まりがちです。

The query is Bun のインストールと bun init・bun add・npm との対照. This page follows bun.sh/docs for installation, projects, and the CLI. Bun is its own runtime and toolchain; trust bun --version and the live docs. For Python, see our uv vs pip/venv guide; for an earlier Bun intro, Bun install and TypeScript. To walk script output on a call, open wbroom; see create and join a room.

What Bun does in a repo

Bun (Oven) ships a JavaScript/TypeScript runtime, a package manager (npm/yarn/pnpm-like), and bundler/test tooling. Day to day you use bun init for package.json, bun add to install deps into the lockfile, bun run <script> for npm-style scripts, and bun run file.ts to execute sources without a separate compile step in many cases.

Install Bun

1. 1

   macOS / Linux script

   Run the documented install command (often curl -fsSL https://bun.sh/install | bash—confirm at bun.sh/docs/installation). Restart the shell or source the profile snippet the installer prints.

2. 2

   Verify

   bun --version and which bun should point at the official install. On Windows, follow PowerShell/WSL instructions on bun.sh.

3. 3

   Alongside mise / nvm

   If you use mise for Node, document whether this repo standardizes on Bun or Node so CI matches laptops.

bun init

1. 1

   Empty folder

   bun init in the target directory; pick a template (blank, React, etc.—CLI options vary). You get package.json and often tsconfig.json.

2. 2

   Existing npm repo

   With package.json already present, skip init and run bun install (Bun maintains bun.lock per docs).

3. 3

   First script

   Add "dev": "bun run src/index.ts" (or your framework default) so bun run dev proves the toolchain.

bun add

1. 1

   Production deps

   bun add lodash mirrors npm install lodash, updating dependencies and the lockfile. Dev deps: bun add -d typescript (flags per docs).

2. 2

   Clone then install

   After git clone, bun install; in CI use frozen lock installs as documented.

3. 3

   Don’t dual-lock blindly

   Pick npm or Bun lock strategy; when migrating from npm, follow bun.sh guidance for package-lock.json vs bun.lock.

bun run

1. 1

   package.json scripts

   bun run dev equals npm run dev. Some builtins omit run (e.g. bun test)—check bun --help.

2. 2

   Run TypeScript directly

   bun run src/index.ts (or forms in docs) often runs TS without a separate tsc step; production may still use bun build or framework bundlers.

3. 3

   Env and args

   Pass env vars like npm (PORT=3000 bun run dev) or use .env per Bun’s loading rules.

# First hour · Bun · 2026-10-20
curl -fsSL https://bun.sh/install | bash   # confirm on bun.sh/docs
bun --version
mkdir my-app && cd my-app && bun init
bun add -d typescript
# package.json → "dev": "bun run src/index.ts"
bun run dev

Bun vs npm / Node

Suggested path: official install → bun init or bun install → bun add → bun run dev. Trust bun.sh/docs and your local bun --help.

Vs our other Bun post

Earlier post focuses install + TypeScript; this one stresses init / add / run scripts vs npm.

Vs uv

uv is Python; Bun is JS/TS—see uv guide.

Not a wbroom feature guide

Bun CLI only; meetings on wbroom.

確認したい質問