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Use the official setup-bun GitHub Action to install bun in your GitHub Actions runner.
workflow.yml
name: my-workflow
jobs:
  my-job:
    name: my-job
    runs-on: ubuntu-latest
    steps:
      # ...
      - uses: actions/checkout@v4
      - uses: oven-sh/setup-bun@v2 // [!code ++]

      # run any `bun` or `bunx` command
      - run: bun install // [!code ++]
      - run: bun index.ts // [!code ++]
      - run: bun run build // [!code ++]
To specify a version of Bun to install:
workflow.yml
name: my-workflow
jobs:
  my-job:
    name: my-job
    runs-on: ubuntu-latest
    steps:
      # ...
      - uses: oven-sh/setup-bun@v2
        with:
          bun-version: 1.2.0 # or "latest", "canary", <sha>
Refer to the README.md for complete documentation of the setup-bun GitHub Action.
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