fix: default token only on public github (#157)

* fix: default token only on public github

* docs: document token

.github/actions/compare-bun-version/action.yml

@@ -0,0 +1,86 @@
+name: ⚖️ Compare Bun Version
+description: Compare the installed Bun version against a version specification.
+
+inputs:
+  bun-version:
+    description: The version spec to compare against (e.g., '1.1.0', 'canary', '>1.2.0', '1.x').
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: 🛠️ Get installed Bun version and revision
+      id: bun
+      shell: bash
+      run: |
+        echo "version=$(bun --version | tr -d '\r\n')" >> $GITHUB_OUTPUT
+        echo "revision=$(bun --revision 2>/dev/null || true)" >> $GITHUB_OUTPUT
+
+    - name: ⚖️ Compare versions
+      shell: bash
+      env:
+        REQUESTED_SPEC: ${{ inputs.bun-version }}
+        ACTUAL_VERSION: ${{ steps.bun.outputs.version }}
+        ACTUAL_REVISION: ${{ steps.bun.outputs.revision }}
+      run: |
+        set -euo pipefail
+
+        # Function to compare two semantic versions (e.g., version_compare 1.2.3 1.10.0)
+        # Returns: 0 if v1 == v2, 1 if v1 > v2, 2 if v1 < v2
+        version_compare() {
+          if [[ "$1" == "$2" ]]; then return 0; fi
+          local lowest=$(printf '%s\n' "$1" "$2" | sort -V | head -n1)
+          if [[ "$1" == "$lowest" ]]; then return 2; else return 1; fi
+        }
+
+        echo "Requested spec: ${REQUESTED_SPEC}"
+        echo "Actual version: ${ACTUAL_VERSION}"
+
+        # Case 1: 'latest' - always passes
+        if [[ "${REQUESTED_SPEC}" == "latest" ]]; then
+          echo "OK: Skipping explicit version check for 'latest'."
+          exit 0
+        fi
+
+        # Case 2: 'canary' - check for 'canary' in revision or version string
+        if [[ "${REQUESTED_SPEC}" == "canary" ]]; then
+          if [[ "${ACTUAL_REVISION}" == *canary* ]] || [[ "${ACTUAL_VERSION}" == *canary* ]]; then
+            echo "OK: Detected canary build (version: ${ACTUAL_VERSION}, revision: ${ACTUAL_REVISION:-n/a})."
+            exit 0
+          else
+            echo "Error: Expected a canary build, but got ${ACTUAL_VERSION} (revision: ${ACTUAL_REVISION:-n/a})."
+            exit 1
+          fi
+        fi
+
+        # Case 3: Semver ranges (e.g., >1.0.0, <2, 1.x, 1.1.0)
+        op_part=$(echo "${REQUESTED_SPEC}" | sed -E 's/^([><=]*).*/\1/')
+        version_part=$(echo "${REQUESTED_SPEC}" | sed -E 's/^[><= ]*//')
+
+        op="${op_part:-==}"
+        version_base="${version_part//.x/}"
+
+        # Handle wildcards like '1.x' or '1'
+        if [[ "${version_part}" == *.x* ]] || { [[ ! "${version_part}" == *.* ]] && [[ "${op}" == "==" ]]; }; then
+           if [[ "${ACTUAL_VERSION}" == "${version_base}" || "${ACTUAL_VERSION}" == "${version_base}".* ]]; then
+              echo "OK: Version ${ACTUAL_VERSION} matches wildcard spec '${REQUESTED_SPEC}'."
+              exit 0
+           else
+              echo "Error: Version ${ACTUAL_VERSION} does not match wildcard spec '${REQUESTED_SPEC}'."
+              exit 1
+           fi
+        fi
+
+        # Perform comparison for >, <, >=, <=, ==
+        version_compare "${ACTUAL_VERSION}" "${version_part}" && result=0 || result=$?
+
+        case "${op}" in
+          '==') if [[ ${result} -ne 0 ]]; then echo "Error: Expected version ${version_part}, but got ${ACTUAL_VERSION}." && exit 1; fi ;;
+          '>')  if [[ ${result} -ne 1 ]]; then echo "Error: Expected version > ${version_part}, but got ${ACTUAL_VERSION}." && exit 1; fi ;;
+          '<')  if [[ ${result} -ne 2 ]]; then echo "Error: Expected version < ${version_part}, but got ${ACTUAL_VERSION}." && exit 1; fi ;;
+          '>=') if [[ ${result} -eq 2 ]]; then echo "Error: Expected version >= ${version_part}, but got ${ACTUAL_VERSION}." && exit 1; fi ;;
+          '<=') if [[ ${result} -eq 1 ]]; then echo "Error: Expected version <= ${version_part}, but got ${ACTUAL_VERSION}." && exit 1; fi ;;
+          *)    echo "Error: Unsupported operator '${op}' in spec '${REQUESTED_SPEC}'." && exit 1 ;;
+        esac
+
+        echo "OK: Version ${ACTUAL_VERSION} satisfies spec '${REQUESTED_SPEC}'."

.github/workflows/format.yml

@@ -14,17 +14,19 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Setup Node
-        uses: actions/setup-node@v4
-        with:
-          node-version: 20.x
-      - name: Install Dependencies
-        run: npm install
-      - name: Format
+      - name: 📥 Checkout
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+
+      - name: 🛠️ Setup Bun
+        uses: ./
+
+      - name: 📦 Install Dependencies
+        run: bun install
+
+      - name: 🧹 Format
         run: |
-          npm run format
-          npm run build
-      - name: Commit
-        uses: autofix-ci/action@d3e591514b99d0fca6779455ff8338516663f7cc
+          bun run format
+          bun run build
+
+      - name: 💾 Commit
+        uses: autofix-ci/action@551dded8c6cc8a1054039c8bc0b8b48c51dfc6ef

.github/workflows/release.yml

@@ -0,0 +1,27 @@
+name: 🚀 Release new action version
+
+on:
+  release:
+    types: [released]
+
+  workflow_dispatch:
+    inputs:
+      TAG_NAME:
+        description: Tag name that the major tag will point to
+        required: true
+
+permissions:
+  contents: write
+
+jobs:
+  update_tag:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+
+      - uses: actions/publish-action@f784495ce78a41bac4ed7e34a73f0034015764bb # v0.3.0
+        env:
+          TAG_NAME: ${{ github.event.inputs.TAG_NAME || github.event.release.tag_name }}
+        with:
+          source-tag: ${{ env.TAG_NAME }}

.github/workflows/test.yml

@@ -1,4 +1,4 @@
-name: Test
+name: 🧪 Test
 
 on:
   workflow_dispatch:
@@ -8,71 +8,276 @@ on:
       - main
 
 permissions:
-  contents: read
+  contents: write
 
 jobs:
+  remove-cache:
+    runs-on: ubuntu-latest
+    permissions: write-all
+    steps:
+      - name: 📥 Checkout
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+
+      - name: 🗑️ Remove cache
+        run: gh cache delete --all || true
+        env:
+          GH_TOKEN: ${{ github.token }}
+
+  tests:
+    name: Tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+
+      - name: Setup Bun
+        uses: ./
+        with:
+          no-cache: true
+
+      - name: Install dependencies
+        run: bun install
+
+      - name: Run tests
+        run: bun test --coverage
+
   setup-bun:
     runs-on: ${{ matrix.os }}
     continue-on-error: true
+    needs: [remove-cache, tests]
+
     strategy:
       matrix:
-        include:
-          - os: windows-latest
-            bun-version: canary
         os:
           - ubuntu-latest
           - macos-latest
+          - windows-latest
+          - windows-11-arm
         bun-version:
           - latest
           - canary
-          - "0.8.1" # last version before 1.0
-          - "0.x"
-          - "1.0.0"
+          - "1.1.0"
           - "1.x"
           - "1"
           - "> 1.0.0"
           - "< 2"
+          # https://github.com/oven-sh/setup-bun/issues/37
+          # - "1.x"
+          # - "1"
+          # - "> 1.0.0"
+          # - "< 2"
           # Disable <sha> support for now. This is because Github Artifacts
           # expire after 90 days, and we don't have another source of truth yet.
           # - "822a00c4d508b54f650933a73ca5f4a3af9a7983" # 1.0.0 commit
+
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Setup Bun
+      - name: 📥 Checkout
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+
+      - name: 🛠️ Setup Bun
         uses: ./
+        id: setup_bun
         with:
           bun-version: ${{ matrix.bun-version }}
-      - name: Run Bun
+          no-cache: true
+
+      - name: ▶️ Run Bun
+        id: run_bun
         run: |
           bun --version
-  setup-bun-from-package-json-version:
+
+      - name: ⚖️ Verify Bun version
+        uses: ./.github/actions/compare-bun-version
+        with:
+          bun-version: ${{ matrix.bun-version }}
+
+  setup-bun-from-file:
+    name: setup-bun from (${{ matrix.os }}, ${{ matrix.file.name }})
     runs-on: ${{ matrix.os }}
+    continue-on-error: true
+    needs: [remove-cache, tests]
     strategy:
       matrix:
         os:
           - ubuntu-latest
           - macos-latest
-        packageManager:
-          - bun@1.0.0
-          - yarn@bun@1.0.0
+          - windows-latest
+          - windows-11-arm
+
+        file:
+          - name: package.json (packageManager bun@1.1.0)
+            file: package.json
+            run: |
+              echo "$(jq '. += {"packageManager": "bun@1.1.0"}' package.json)" > package.json
+
+          - name: foo/package.json (packageManager bun@1.1.0)
+            file: foo/package.json
+            run: |
+              mkdir -p foo
+              echo "$(jq '. += {"packageManager": "bun@1.1.0"}' package.json)" > foo/package.json
+
+          - name: package.json (packageManager yarn@bun@1.1.0)
+            file: package.json
+            run: |
+              echo "$(jq '. += {"packageManager": "yarn@bun@1.1.0"}' package.json)" > package.json
+
+          - name: package.json (engines bun@1.1.0)
+            file: package.json
+            run: |
+              echo "$(jq '.engines = {"bun": "1.1.0"}' package.json)" > package.json
+
+          - name: .tool-versions (bun 1.1.0)
+            file: .tool-versions
+            run: echo "bun 1.1.0" > .tool-versions
+
+          - name: .tool-versions (bun1.1.0)
+            file: .tool-versions
+            run: echo "bun1.1.0" > .tool-versions
+
+          - name: .tool-versions (bun  1.1.0)
+            file: .tool-versions
+            run: echo "bun 1.1.0" > .tool-versions
+
+          - name: .bumrc (1.1.0)
+            file: .bumrc
+            run: echo "1.1.0" > .bumrc
+
+          - name: .bun-version (1.1.0)
+            file: .bun-version
+            run: echo "1.1.0" > .bun-version
+
     steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Setup package.json
-        run: |
-          echo "$(jq '. += {"packageManager": "${{ matrix.packageManager }}"}' package.json)" > package.json
-      - name: Setup Bun
+      - name: 📥 Checkout
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+
+      - name: 📄 Setup file
+        run: ${{ matrix.file.run }}
+
+      - name: 🛠️ Setup Bun
         uses: ./
-      - name: Run Bun
-        id: bun
+        with:
+          bun-version-file: ${{ matrix.file.file }}
+          no-cache: true
+
+      - name: ⚖️ Compare versions
+        uses: ./.github/actions/compare-bun-version
+        with:
+          bun-version: "1.1.0"
+
+  setup-bun-from-package-json-without-specified-field:
+    name: setup-bun from (${{ matrix.os }}, ${{ matrix.file.name }}) without specified field
+    runs-on: ${{ matrix.os }}
+    continue-on-error: true
+    needs: [remove-cache, tests]
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+          - windows-11-arm
+
+        file:
+          - name: package.json (packageManager bun@1.1.0)
+            file: package.json
+            run: |
+              echo "$(jq '. += {"packageManager": "bun@1.1.0"}' package.json)" > package.json
+
+          - name: package.json (packageManager yarn@bun@1.1.0)
+            file: package.json
+            run: |
+              echo "$(jq '. += {"packageManager": "yarn@bun@1.1.0"}' package.json)" > package.json
+
+          - name: package.json (engines bun@1.1.0)
+            file: package.json
+            run: |
+              echo "$(jq '.engines = {"bun": "1.1.0"}' package.json)" > package.json
+
+    steps:
+      - name: 📥 Checkout
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+
+      - name: 📄 Setup file
+        run: ${{ matrix.file.run }}
+
+      - name: 🛠️ Setup Bun
+        uses: ./
+        with:
+          no-cache: true
+
+      - name: ⚖️ Compare versions
+        uses: ./.github/actions/compare-bun-version
+        with:
+          bun-version: "1.1.0"
+
+  setup-bun-download-url:
+    name: setup-bun from (${{ matrix.os }}, download url)
+    runs-on: ${{ matrix.os }}
+    continue-on-error: true
+    needs: [remove-cache, tests]
+
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+
+    steps:
+      - name: 📥 Checkout
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+
+      - name: 🛠️ Setup Bun
+        uses: ./
+        id: setup_bun
+        with:
+          bun-download-url: "https://github.com/oven-sh/bun/releases/latest/download/bun-${{runner.os == 'macOS' && 'darwin' || runner.os}}-${{ runner.arch == 'X64' && 'x64' || 'aarch64' }}.zip"
+
+      - name: ▶️ Run Bun
+        id: run_bun
         run: |
           bun --version
-          echo "version=$(bun --version)" >> $GITHUB_OUTPUT
-      - name: Check version
+
+  test-custom-registries:
+    name: test installing deps from custom registries (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    continue-on-error: true
+    needs: [remove-cache, tests]
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+
+    steps:
+      - name: 📥 Checkout
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+
+      - name: 🛠️ Setup Bun
+        uses: ./
+        id: setup_bun
+        with:
+          registries: |
+            https://registry.npmjs.org
+            @types:https://registry.yarnpkg.com
+
+      - name: ▶️ Install from default registry
         run: |
-          if [[ "${{ steps.bun.outputs.version }}" == "1.0.0" ]]; then
-            echo "Version is 1.0.0"
+          output=$(bun add is-odd --verbose --force 2>&1)
+
+          if echo "$output" | grep -q "HTTP/1.1 GET https://registry.npmjs.org/is-odd"; then
+            echo "Successfully installed from default registry"
           else
-            echo "Expected version to be 1.0.0, got ${{ steps.bun.outputs.version }}"
+            echo "Failed to install from default registry"
             exit 1
-          fi
+          fi
+
+      - name: ▶️ Install from @types registry
+        run: |
+          output=$(bun add @types/bun --verbose --force 2>&1)
+
+          if echo "$output" | grep -q "HTTP/1.1 GET https://registry.yarnpkg.com/@types%2fbun"; then
+            echo "Successfully installed from @types registry"
+          else
+            echo "Failed to install from @types registry"
+            exit 1
+          fi

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "semi": true,
+  "quoteProps": "preserve"
+}

.vscode/extensions.json

@@ -0,0 +1,3 @@
+{
+  "recommendations": ["esbenp.prettier-vscode", "github.vscode-github-actions"]
+}

.vscode/settings.json

@@ -0,0 +1,12 @@
+{
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "search.exclude": {
+    "dist/**": true
+  },
+  // Lock changes to these files
+  "files.readonlyInclude": {
+    "dist/**": true,
+    "bun.lock": true,
+    "package-lock.json": true
+  },
+}

README.md

@@ -5,41 +5,95 @@ Download, install, and setup [Bun](https://bun.sh) in GitHub Actions.
 ## Usage
 
 ```yaml
-- uses: oven-sh/setup-bun@v1
+- uses: oven-sh/setup-bun@v2
+```
+
+By default, if no version is specified, the action will:
+
+1. Check `package.json` for the `packageManager` field (e.g., `"packageManager": "bun@1.0.25"`)
+2. If `packageManager` doesn't exist, check `package.json` for `engines.bun`
+3. If neither exists or `package.json` is not found, use `latest`
+
+You can also explicitly specify a version:
+
+```yaml
+- uses: oven-sh/setup-bun@v2
   with:
     bun-version: latest
 ```
 
-### Using a custom NPM registry
+## Using version file
 
 ```yaml
-- uses: oven-sh/setup-bun@v1
+- uses: oven-sh/setup-bun@v2
   with:
-    registry-url: "https://npm.pkg.github.com/"
-    scope: "@foo"
+    bun-version-file: ".bun-version"
 ```
 
-If you need to authenticate with a private registry, you can set the `BUN_AUTH_TOKEN` environment variable.
+## Using custom registries
+
+You can configure multiple package registries using the `registries` input. This supports both default and scoped registries with various authentication methods.
+
+### Registry configuration
 
 ```yaml
-- name: Install Dependencies
+- uses: oven-sh/setup-bun@v2
+  with:
+    registries: |
+      https://registry.npmjs.org/
+      @myorg:https://npm.pkg.github.com/|$GITHUB_TOKEN
+      @internal:https://username:$INTERNAL_PASSWORD@registry.internal.com/
+
+- name: Install dependencies
   env:
-    BUN_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    INTERNAL_PASSWORD: ${{ secrets.INTERNAL_PASSWORD }}
   run: bun install
 ```
 
+#### Registry format options
+
+| Type                                 | Format                                                    |
+| ------------------------------------ | --------------------------------------------------------- |
+| Default registry                     | `https://registry.example.com/`                           |
+| Default registry with token          | `https://registry.example.com/\|$TOKEN`                   |
+| Scoped registry                      | `@scope:https://registry.example.com/`                    |
+| Scoped registry with token           | `@scope:https://registry.example.com/\|$TOKEN`            |
+| Scoped registry with URL credentials | `@scope:https://username:$PASSWORD@registry.example.com/` |
+
+> [!IMPORTANT]
+> When using authentication, make sure to set the corresponding environment variables in your workflow steps that need access to the registries.
+
+For more information about configuring registries in Bun, see the [official documentation](https://bun.sh/docs/install/registries).
+
+### Override download url
+
+If you need to override the download URL, you can use the `bun-download-url` input.
+
+```yaml
+- uses: oven-sh/setup-bun@v2
+  with:
+    bun-download-url: "https://github.com/oven-sh/bun/releases/latest/download/bun-linux-x64.zip"
+```
+
 ## Inputs
 
-| Name           | Description                                        | Default     | Examples                        |
-| -------------- | -------------------------------------------------- | ----------- | ------------------------------- |
-| `bun-version`  | The version of Bun to download and install.        | `latest`    | `canary`, `1.0.0`, `1.0.x`      |
-| `registry-url` | Registry URL where some private package is stored. | `undefined` | `"https://npm.pkg.github.com/"` |
-| `scope`        | Scope for private pacakages.                       | `undefined` | `"@foo"`, `"@orgname"`          |
+| Name               | Description                                                                       | Default                                  | Examples                                         |
+| ------------------ | --------------------------------------------------------------------------------- | ---------------------------------------- | ------------------------------------------------ |
+| `bun-version`      | The version of Bun to download and install.                                       | Version from `package.json`, or `latest` | `canary`, `1.0.0`, `1.0.x`                       |
+| `bun-version-file` | The version of Bun to download and install from file.                             | `undefined`                              | `package.json`, `.bun-version`, `.tool-versions` |
+| `bun-download-url` | URL to download .zip file for Bun release                                         |                                          |                                                  |
+| `registry-url`     | Registry URL where some private package is stored.                                | `undefined`                              | `"https://npm.pkg.github.com/"`                  |
+| `scope`            | Scope for private packages.                                                       | `undefined`                              | `"@foo"`, `"@orgname"`                           |
+| `no-cache`         | Disable caching of the downloaded executable.                                     | `false`                                  | `true`, `false`                                  |
+| `token`            | Personal access token (PAT) used to fetch tags from the `oven-sh/bun` repository. | `${{ github.token }}`                    | `${{ secrets.GITHUB_TOKEN }}`                    |
 
 ## Outputs
 
-| Name           | Description                                | Example          |
-| -------------- | ------------------------------------------ | ---------------- |
-| `cache-hit`    | If the Bun executable was read from cache. | `true`           |
-| `bun-version`  | The output from `bun --version`.           | `1.0.0`          |
-| `bun-revision` | The output from `bun --revision`.          | `1.0.0+822a00c4` |
+| Name               | Description                                | Example                                                            |
+| ------------------ | ------------------------------------------ | ------------------------------------------------------------------ |
+| `bun-version`      | The output from `bun --version`.           | `1.0.0`                                                            |
+| `bun-revision`     | The output from `bun --revision`.          | `1.0.0+822a00c4`                                                   |
+| `bun-path`         | The path to the Bun executable.            | `/path/to/bun`                                                     |
+| `bun-download-url` | The URL from which Bun was downloaded.     | `https://bun.sh/download/latest/linux/x64?avx2=true&profile=false` |
+| `cache-hit`        | If the Bun executable was read from cache. | `true`                                                             |

action.yml

@@ -1,26 +1,63 @@
 name: Setup Bun
 description: Download, install, and setup Bun to your path.
 author: robobun
+
 branding:
   icon: play-circle
   color: white
+
 inputs:
   bun-version:
-    description: 'The version of Bun to install. (e.g. "latest", "canary", "1.0.0", "1.0.x", <sha>)'
+    description: The version of Bun to install. (e.g. "latest", "canary", "1.0.0", "1.0.x", <sha>)
+    required: false
+  bun-version-file:
+    description: The version of Bun to install from file. (e.g. "package.json", ".bun-version", ".tool-versions")
+    default: null
+    required: false
+  bun-download-url:
+    description: Override the URL to download Bun from. This skips version resolution and verifying AVX2 support.
+    required: false
+  registries:
+    description: |
+      List of package registries with authentication support. Format:
+      - Default registry: https://registry.npmjs.org/
+      - Default with token: https://registry.npmjs.org/|token
+      - Scoped registry: @scope:https://registry.example.com/
+      - Scoped with token: @scope:https://registry.example.com/|token
+      - Scoped with credentials: @scope:https://user:pass@registry.example.com/
     required: false
   registry-url:
     required: false
-    description: "The URL of the package registry to use for installing Bun. Set the $BUN_AUTH_TOKEN environment variable to authenticate with the registry."
+    description: The URL of the package registry to use for installing Bun. Set the $BUN_AUTH_TOKEN environment variable to authenticate with the registry.
+    deprecationMessage: "Use 'registries' input instead."
   scope:
     required: false
     description: "The scope for authenticating with the package registry."
+    deprecationMessage: "Use 'registries' input instead."
+  no-cache:
+    required: false
+    type: boolean
+    default: false
+    description: Disable caching of bun executable.
+  token:
+    required: false
+    default: ${{ github.server_url == 'https://github.com' && github.token || '' }}
+    description: Personal access token (PAT) used to fetch tags from oven-sh/bun repository. Recommended for resolving wildcard/range versions to avoid GitHub API rate limiting. When running this action on github.com, the default value is sufficient. When running on GHES, you can pass a personal access token for github.com if you are experiencing rate limiting.
+
 outputs:
   bun-version:
     description: The version of Bun that was installed.
   bun-revision:
     description: The revision of Bun that was installed.
+  bun-path:
+    description: The path to the Bun executable.
+  bun-download-url:
+    description: The URL from which Bun was downloaded.
   cache-hit:
     description: If the version of Bun was cached.
+
 runs:
-  using: node20
-  main: dist/index.js
+  using: "node20"
+  main: "dist/setup/index.js"
+  post: "dist/cache-save/index.js"
+  post-if: success()

bun.lock

@@ -0,0 +1,239 @@
+{
+  "lockfileVersion": 1,
+  "configVersion": 0,
+  "workspaces": {
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+        "@actions/io": "^1.1.2",
+        "@actions/tool-cache": "^2.0.1",
+        "@iarna/toml": "^2.2.5",
+        "compare-versions": "^6.1.1",
+      },
+      "devDependencies": {
+        "@types/bun": "^1.1.13",
+        "@types/node": "^20.8.2",
+        "esbuild": "^0.19.2",
+        "prettier": "^3.4.2",
+        "typescript": "^4.9.5",
+      },
+    },
+  },
+  "patchedDependencies": {
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+  },
+  "overrides": {
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+    "esbuild": ["esbuild@0.19.2", "", { "optionalDependencies": { "@esbuild/android-arm": "0.19.2", "@esbuild/android-arm64": "0.19.2", "@esbuild/android-x64": "0.19.2", "@esbuild/darwin-arm64": "0.19.2", "@esbuild/darwin-x64": "0.19.2", "@esbuild/freebsd-arm64": "0.19.2", "@esbuild/freebsd-x64": "0.19.2", "@esbuild/linux-arm": "0.19.2", "@esbuild/linux-arm64": "0.19.2", "@esbuild/linux-ia32": "0.19.2", "@esbuild/linux-loong64": "0.19.2", "@esbuild/linux-mips64el": "0.19.2", "@esbuild/linux-ppc64": "0.19.2", "@esbuild/linux-riscv64": "0.19.2", "@esbuild/linux-s390x": "0.19.2", "@esbuild/linux-x64": "0.19.2", "@esbuild/netbsd-x64": "0.19.2", "@esbuild/openbsd-x64": "0.19.2", "@esbuild/sunos-x64": "0.19.2", "@esbuild/win32-arm64": "0.19.2", "@esbuild/win32-ia32": "0.19.2", "@esbuild/win32-x64": "0.19.2" }, "bin": "bin/esbuild" }, ""],
+
+    "event-target-shim": ["event-target-shim@5.0.1", "", {}, ""],
+
+    "events": ["events@3.3.0", "", {}, ""],
+
+    "form-data": ["form-data@4.0.5", "", { "dependencies": { "asynckit": "^0.4.0", "combined-stream": "^1.0.8", "es-set-tostringtag": "^2.1.0", "hasown": "^2.0.2", "mime-types": "^2.1.12" } }, "sha512-8RipRLol37bNs2bhoV67fiTEvdTrbMUYcFTiy3+wuuOnUog2QBHCZWXDRijWQfAkhBj2Uf5UnVaiWwA5vdd82w=="],
+
+    "function-bind": ["function-bind@1.1.2", "", {}, "sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA=="],
+
+    "get-intrinsic": ["get-intrinsic@1.3.0", "", { "dependencies": { "call-bind-apply-helpers": "^1.0.2", "es-define-property": "^1.0.1", "es-errors": "^1.3.0", "es-object-atoms": "^1.1.1", "function-bind": "^1.1.2", "get-proto": "^1.0.1", "gopd": "^1.2.0", "has-symbols": "^1.1.0", "hasown": "^2.0.2", "math-intrinsics": "^1.1.0" } }, "sha512-9fSjSaos/fRIVIp+xSJlE6lfwhES7LNtKaCBIamHsjr2na1BiABJPo0mOjjz8GJDURarmCPGqaiVg5mfjb98CQ=="],
+
+    "get-proto": ["get-proto@1.0.1", "", { "dependencies": { "dunder-proto": "^1.0.1", "es-object-atoms": "^1.0.0" } }, "sha512-sTSfBjoXBp89JvIKIefqw7U2CCebsc74kiY6awiGogKtoSGbgjYE/G/+l9sF3MWFPNc9IcoOC4ODfKHfxFmp0g=="],
+
+    "gopd": ["gopd@1.2.0", "", {}, "sha512-ZUKRh6/kUFoAiTAtTYPZJ3hw9wNxx+BIBOijnlG9PnrJsCcSjs1wyyD6vJpaYtgnzDrKYRSqf3OO6Rfa93xsRg=="],
+
+    "has-symbols": ["has-symbols@1.1.0", "", {}, "sha512-1cDNdwJ2Jaohmb3sg4OmKaMBwuC48sYni5HUw2DvsC8LjGTLK9h+eb1X6RyuOHe4hT0ULCW68iomhjUoKUqlPQ=="],
+
+    "has-tostringtag": ["has-tostringtag@1.0.2", "", { "dependencies": { "has-symbols": "^1.0.3" } }, "sha512-NqADB8VjPFLM2V0VvHUewwwsw0ZWBaIdgo+ieHtK3hasLz4qeCRjYcqfB6AQrBggRKppKF8L52/VqdVsO47Dlw=="],
+
+    "hasown": ["hasown@2.0.2", "", { "dependencies": { "function-bind": "^1.1.2" } }, "sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ=="],
+
+    "math-intrinsics": ["math-intrinsics@1.1.0", "", {}, "sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g=="],
+
+    "mime-db": ["mime-db@1.52.0", "", {}, ""],
+
+    "mime-types": ["mime-types@2.1.35", "", { "dependencies": { "mime-db": "1.52.0" } }, ""],
+
+    "minimatch": ["minimatch@3.0.8", "", { "dependencies": { "brace-expansion": "^1.1.7" } }, ""],
+
+    "node-fetch": ["node-fetch@2.7.0", "", { "dependencies": { "whatwg-url": "^5.0.0" }, "peerDependencies": { "encoding": "^0.1.0" }, "optionalPeers": ["encoding"] }, ""],
+
+    "prettier": ["prettier@3.4.2", "", { "bin": "bin/prettier.cjs" }, "sha512-e9MewbtFo+Fevyuxn/4rrcDAaq0IYxPGLvObpQjiZBMAzB9IGmzlnG9RZy3FFas+eBMu2vA0CszMeduow5dIuQ=="],
+
+    "process": ["process@0.11.10", "", {}, ""],
+
+    "sax": ["sax@1.2.4", "", {}, ""],
+
+    "semver": ["semver@6.3.1", "", { "bin": "bin/semver.js" }, ""],
+
+    "tr46": ["tr46@0.0.3", "", {}, ""],
+
+    "tslib": ["tslib@2.6.2", "", {}, ""],
+
+    "tunnel": ["tunnel@0.0.6", "", {}, ""],
+
+    "typescript": ["typescript@4.9.5", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, ""],
+
+    "undici-types": ["undici-types@5.26.5", "", {}, "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA=="],
+
+    "uuid": ["uuid@3.4.0", "", { "bin": "bin/uuid" }, ""],
+
+    "webidl-conversions": ["webidl-conversions@3.0.1", "", {}, ""],
+
+    "whatwg-url": ["whatwg-url@5.0.0", "", { "dependencies": { "tr46": "~0.0.3", "webidl-conversions": "^3.0.0" } }, ""],
+
+    "xml2js": ["xml2js@0.5.0", "", { "dependencies": { "sax": ">=0.6.0", "xmlbuilder": "~11.0.0" } }, ""],
+
+    "xmlbuilder": ["xmlbuilder@11.0.1", "", {}, ""],
+
+    "@actions/cache/@actions/glob": ["@actions/glob@0.1.2", "", { "dependencies": { "@actions/core": "^1.2.6", "minimatch": "^3.0.4" } }, ""],
+
+    "@azure/core-http/uuid": ["uuid@8.3.2", "", { "bin": "dist/bin/uuid" }, ""],
+
+    "@azure/ms-rest-js/tslib": ["tslib@1.14.1", "", {}, ""],
+
+    "@azure/ms-rest-js/uuid": ["uuid@8.3.2", "", { "bin": "dist/bin/uuid" }, ""],
+
+    "@protobuf-ts/plugin/typescript": ["typescript@3.9.10", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q=="],
+
+    "@protobuf-ts/plugin-framework/typescript": ["typescript@3.9.10", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q=="],
+  }
+}

bunfig.toml

@@ -0,0 +1,2 @@
+[install]
+saveTextLockfile = true

package-lock.json

@@ -1,33 +1,37 @@
 {
   "name": "setup-bun",
-  "version": "1.1.1",
+  "version": "2.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "setup-bun",
-      "version": "1.1.1",
+      "version": "2.1.0",
       "license": "MIT",
       "dependencies": {
-        "@actions/cache": "^3.1.4",
-        "@actions/core": "^1.10.0",
+        "@actions/cache": "^4.0.0",
+        "@actions/core": "^1.11.0",
         "@actions/exec": "^1.1.1",
         "@actions/glob": "^0.4.0",
         "@actions/io": "^1.1.2",
-        "@actions/tool-cache": "^2.0.1"
+        "@actions/tool-cache": "^2.0.1",
+        "@iarna/toml": "^2.2.5",
+        "compare-versions": "^6.1.1"
       },
       "devDependencies": {
+        "@types/bun": "^1.1.13",
         "@types/node": "^20.8.2",
         "esbuild": "^0.19.2",
-        "prettier": "^2.8.4",
+        "prettier": "^3.4.2",
         "typescript": "^4.9.5"
       }
     },
     "node_modules/@actions/cache": {
-      "version": "3.2.2",
-      "license": "MIT",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/@actions/cache/-/cache-4.0.3.tgz",
+      "integrity": "sha512-SvrqFtYJ7I48A/uXNkoJrnukx5weQv1fGquhs3+4nkByZThBH109KTIqj5x/cGV7JGNvb8dLPVywUOqX1fjiXg==",
       "dependencies": {
-        "@actions/core": "^1.10.0",
+        "@actions/core": "^1.11.1",
         "@actions/exec": "^1.0.1",
         "@actions/glob": "^0.1.0",
         "@actions/http-client": "^2.1.1",
@@ -35,8 +39,8 @@
         "@azure/abort-controller": "^1.1.0",
         "@azure/ms-rest-js": "^2.6.0",
         "@azure/storage-blob": "^12.13.0",
-        "semver": "^6.1.0",
-        "uuid": "^3.3.3"
+        "@protobuf-ts/plugin": "^2.9.4",
+        "semver": "^6.3.1"
       }
     },
     "node_modules/@actions/cache/node_modules/@actions/glob": {
@@ -48,18 +52,12 @@
       }
     },
     "node_modules/@actions/core": {
-      "version": "1.10.1",
-      "license": "MIT",
+      "version": "1.11.1",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.11.1.tgz",
+      "integrity": "sha512-hXJCSrkwfA46Vd9Z3q4cpEpHB1rL5NG04+/rbqW9d3+CSvtB1tYe8UTpAlixa1vj0m/ULglfEK2UKxMGxCxv5A==",
       "dependencies": {
-        "@actions/http-client": "^2.0.1",
-        "uuid": "^8.3.2"
-      }
-    },
-    "node_modules/@actions/core/node_modules/uuid": {
-      "version": "8.3.2",
-      "license": "MIT",
-      "bin": {
-        "uuid": "dist/bin/uuid"
+        "@actions/exec": "^1.1.1",
+        "@actions/http-client": "^2.0.1"
       }
     },
     "node_modules/@actions/exec": {
@@ -145,18 +143,6 @@
         "node": ">=14.0.0"
       }
     },
-    "node_modules/@azure/core-http/node_modules/form-data": {
-      "version": "4.0.0",
-      "license": "MIT",
-      "dependencies": {
-        "asynckit": "^0.4.0",
-        "combined-stream": "^1.0.8",
-        "mime-types": "^2.1.12"
-      },
-      "engines": {
-        "node": ">= 6"
-      }
-    },
     "node_modules/@azure/core-http/node_modules/uuid": {
       "version": "8.3.2",
       "license": "MIT",
@@ -261,6 +247,57 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.19.2.tgz",
+      "integrity": "sha512-tM8yLeYVe7pRyAu9VMi/Q7aunpLwD139EY1S99xbQkT4/q2qa6eA4ige/WJQYdJ8GBL1K33pPFhPfPdJ/WzT8Q==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.19.2.tgz",
+      "integrity": "sha512-lsB65vAbe90I/Qe10OjkmrdxSX4UJDjosDgb8sZUKcg3oefEuW2OT2Vozz8ef7wrJbMcmhvCC+hciF8jY/uAkw==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/android-x64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.19.2.tgz",
+      "integrity": "sha512-qK/TpmHt2M/Hg82WXHRc/W/2SGo/l1thtDHZWqFq7oi24AjZ4O/CpPSu6ZuYKFkEgmZlFoa7CooAyYmuvnaG8w==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/@esbuild/darwin-arm64": {
       "version": "0.19.2",
       "cpu": [
@@ -276,6 +313,318 @@
         "node": ">=12"
       }
     },
+    "node_modules/@esbuild/darwin-x64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.19.2.tgz",
+      "integrity": "sha512-tP+B5UuIbbFMj2hQaUr6EALlHOIOmlLM2FK7jeFBobPy2ERdohI4Ka6ZFjZ1ZYsrHE/hZimGuU90jusRE0pwDw==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/freebsd-arm64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-arm64/-/freebsd-arm64-0.19.2.tgz",
+      "integrity": "sha512-YbPY2kc0acfzL1VPVK6EnAlig4f+l8xmq36OZkU0jzBVHcOTyQDhnKQaLzZudNJQyymd9OqQezeaBgkTGdTGeQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/freebsd-x64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/freebsd-x64/-/freebsd-x64-0.19.2.tgz",
+      "integrity": "sha512-nSO5uZT2clM6hosjWHAsS15hLrwCvIWx+b2e3lZ3MwbYSaXwvfO528OF+dLjas1g3bZonciivI8qKR/Hm7IWGw==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/linux-arm": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.19.2.tgz",
+      "integrity": "sha512-Odalh8hICg7SOD7XCj0YLpYCEc+6mkoq63UnExDCiRA2wXEmGlK5JVrW50vZR9Qz4qkvqnHcpH+OFEggO3PgTg==",
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+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
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+      }
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+    "node_modules/@esbuild/linux-arm64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.19.2.tgz",
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+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@esbuild/linux-ia32": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-ia32/-/linux-ia32-0.19.2.tgz",
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+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@esbuild/linux-loong64": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.19.2.tgz",
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+        "loong64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
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+      "engines": {
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+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/math-intrinsics": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",
+      "integrity": "sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
       }
     },
     "node_modules/mime-db": {
@@ -473,14 +1108,16 @@
       }
     },
     "node_modules/prettier": {
-      "version": "2.8.8",
+      "version": "3.4.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.4.2.tgz",
+      "integrity": "sha512-e9MewbtFo+Fevyuxn/4rrcDAaq0IYxPGLvObpQjiZBMAzB9IGmzlnG9RZy3FFas+eBMu2vA0CszMeduow5dIuQ==",
       "dev": true,
       "license": "MIT",
       "bin": {
-        "prettier": "bin-prettier.js"
+        "prettier": "bin/prettier.cjs"
       },
       "engines": {
-        "node": ">=10.13.0"
+        "node": ">=14"
       },
       "funding": {
         "url": "https://github.com/prettier/prettier?sponsor=1"

package.json

@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "setup-bun",
-  "version": "1.1.1",
+  "version": "2.1.0",
   "description": "Setup Bun on GitHub Actions.",
   "keywords": [
     "bun",
@@ -18,24 +18,30 @@
   "author": "xHyroM",
   "scripts": {
     "format": "prettier --write src *.yml *.json *.md",
-    "build": "esbuild --target=node20 --outdir=dist --bundle --minify --platform=node --format=cjs src/index.ts",
-    "start": "npm run build && node dist/index.js"
+    "build": "esbuild --target=node20 --outfile=dist/setup/index.js --bundle --keep-names --minify --platform=node --format=cjs src/index.ts && esbuild --target=node20 --outfile=dist/cache-save/index.js --bundle --keep-names --minify --platform=node --format=cjs src/cache-save.ts",
+    "start": "npm run build && node dist/setup/index.js"
   },
   "dependencies": {
-    "@actions/cache": "^3.1.4",
-    "@actions/core": "^1.10.0",
+    "@actions/cache": "^4.0.0",
+    "@actions/core": "^1.11.0",
     "@actions/exec": "^1.1.1",
     "@actions/glob": "^0.4.0",
     "@actions/io": "^1.1.2",
-    "@actions/tool-cache": "^2.0.1"
+    "@actions/tool-cache": "^2.0.1",
+    "@iarna/toml": "^2.2.5",
+    "compare-versions": "^6.1.1"
   },
   "devDependencies": {
+    "@types/bun": "^1.1.13",
     "@types/node": "^20.8.2",
     "esbuild": "^0.19.2",
-    "prettier": "^2.8.4",
+    "prettier": "^3.4.2",
     "typescript": "^4.9.5"
   },
-  "prettier": {
-    "quoteProps": "preserve"
+  "patchedDependencies": {
+    "compare-versions@6.1.1": "patches/compare-versions@6.1.1.patch"
+  },
+  "overrides": {
+    "form-data": "^4.0.4"
   }
 }

patches/compare-versions@6.1.1.patch

@@ -0,0 +1,67 @@
+diff --git a/lib/esm/satisfies.js b/lib/esm/satisfies.js
+index 7586b71657332f855431c4dd4f05e9394fd9aac3..a6ec29bfc98907c67ed4af71fca73bd8bff88798 100644
+--- a/lib/esm/satisfies.js
++++ b/lib/esm/satisfies.js
+@@ -40,8 +40,9 @@ export const satisfies = (version, range) => {
+     // else range of either "~" or "^" is assumed
+     const [v1, v2, v3, , vp] = validateAndParse(version);
+     const [r1, r2, r3, , rp] = validateAndParse(range);
+-    const v = [v1, v2, v3];
++    const v = [v1, v2 !== null && v2 !== void 0 ? v2 : 'x', v3 !== null && v3 !== void 0 ? v3 : 'x'];
+     const r = [r1, r2 !== null && r2 !== void 0 ? r2 : 'x', r3 !== null && r3 !== void 0 ? r3 : 'x'];
++
+     // validate pre-release
+     if (rp) {
+         if (!vp)
+diff --git a/lib/esm/utils.js b/lib/esm/utils.js
+index b5cc8b9927ab38fc67032c133b531e95ec4cec15..ec56105fd2d806aa922f1488a27b02c56aff1865 100644
+--- a/lib/esm/utils.js
++++ b/lib/esm/utils.js
+@@ -28,7 +28,7 @@ const compareStrings = (a, b) => {
+ };
+ export const compareSegments = (a, b) => {
+     for (let i = 0; i < Math.max(a.length, b.length); i++) {
+-        const r = compareStrings(a[i] || '0', b[i] || '0');
++        const r = compareStrings(a[i] || 'x', b[i] || 'x');
+         if (r !== 0)
+             return r;
+     }
+diff --git a/lib/umd/index.js b/lib/umd/index.js
+index 2cfef261bca520e21ed41fc14950732b8aa6339b..1059784db86635f3aaaba83b5a72c5015e1d8490 100644
+--- a/lib/umd/index.js
++++ b/lib/umd/index.js
+@@ -152,7 +152,7 @@
+         // else range of either "~" or "^" is assumed
+         const [v1, v2, v3, , vp] = validateAndParse(version);
+         const [r1, r2, r3, , rp] = validateAndParse(range);
+-        const v = [v1, v2, v3];
++        const v = [v1, v2 !== null && v2 !== void 0 ? v2 : 'x', v3 !== null && v3 !== void 0 ? v3 : 'x'];
+         const r = [r1, r2 !== null && r2 !== void 0 ? r2 : 'x', r3 !== null && r3 !== void 0 ? r3 : 'x'];
+         // validate pre-release
+         if (rp) {
+diff --git a/package.json b/package.json
+index b05b3daf706d7ba4e594233f8791fc3007a8e2cd..e51e76b86f95e9ebf0b5dba3b82aeb119628528d 100644
+--- a/package.json
++++ b/package.json
+@@ -26,7 +26,7 @@
+     "prepublishOnly": "npm run build",
+     "test": "c8 --reporter=lcov mocha"
+   },
+-  "main": "./lib/umd/index.js",
++  "main": "./lib/src/index.ts",
+   "module": "./lib/esm/index.js",
+   "types": "./lib/esm/index.d.ts",
+   "sideEffects": false,
+diff --git a/src/satisfies.ts b/src/satisfies.ts
+index 66cb171d7f32e68fdda6929d2da223b97a053737..6b4973f037843f264338a01efdc4ace5dcf042cd 100644
+--- a/src/satisfies.ts
++++ b/src/satisfies.ts
+@@ -43,7 +43,7 @@ export const satisfies = (version: string, range: string): boolean => {
+   // else range of either "~" or "^" is assumed
+   const [v1, v2, v3, , vp] = validateAndParse(version);
+   const [r1, r2, r3, , rp] = validateAndParse(range);
+-  const v = [v1, v2, v3];
++  const v = [v1, v2 ?? 'x', v3 ?? 'x'];
+   const r = [r1, r2 ?? 'x', r3 ?? 'x'];
+ 
+   // validate pre-release

src/action.ts

@@ -1,3 +1,4 @@
+import { createHash } from "node:crypto";
 import { homedir } from "node:os";
 import { join } from "node:path";
 import {
@@ -6,12 +7,18 @@ import {
   symlinkSync,
   renameSync,
   copyFileSync,
+  existsSync,
 } from "node:fs";
 import { addPath, info, warning } from "@actions/core";
-import { isFeatureAvailable, restoreCache, saveCache } from "@actions/cache";
+import { isFeatureAvailable, restoreCache } from "@actions/cache";
 import { downloadTool, extractZip } from "@actions/tool-cache";
 import { getExecOutput } from "@actions/exec";
+import { Registry } from "./registry";
 import { writeBunfig } from "./bunfig";
+import { saveState } from "@actions/core";
+import { addExtension } from "./utils";
+import { getDownloadUrl } from "./download-url";
+import { cwd } from "node:process";
 
 export type Input = {
   customUrl?: string;
@@ -20,21 +27,31 @@ export type Input = {
   arch?: string;
   avx2?: boolean;
   profile?: boolean;
-  scope?: string;
-  registryUrl?: string;
+  registries?: Registry[];
+  noCache?: boolean;
+  token?: string;
 };
 
 export type Output = {
   version: string;
   revision: string;
+  bunPath: string;
+  url: string;
   cacheHit: boolean;
 };
 
-export default async (options: Input): Promise<Output> => {
-  const bunfigPath = join(process.cwd(), "bunfig.toml");
-  writeBunfig(bunfigPath, options);
+export type CacheState = {
+  cacheEnabled: boolean;
+  cacheHit: boolean;
+  bunPath: string;
+  url: string;
+};
 
-  const url = getDownloadUrl(options);
+export default async (options: Input): Promise<Output> => {
+  const bunfigPath = join(cwd(), "bunfig.toml");
+  writeBunfig(bunfigPath, options.registries);
+
+  const url = await getDownloadUrl(options);
   const cacheEnabled = isCacheEnabled(options);
 
   const binPath = join(homedir(), ".bun", "bin");
@@ -60,60 +77,114 @@ export default async (options: Input): Promise<Output> => {
 
   let revision: string | undefined;
   let cacheHit = false;
-  if (cacheEnabled) {
-    const cacheRestored = await restoreCache([bunPath], url);
-    if (cacheRestored) {
-      revision = await getRevision(bunPath);
-      if (revision) {
-        cacheHit = true;
-        info(`Using a cached version of Bun: ${revision}`);
-      } else {
-        warning(
-          `Found a cached version of Bun: ${revision} (but it appears to be corrupted?)`
-        );
-      }
+
+  // Check if Bun executable already exists and matches requested version
+  if (!options.customUrl && existsSync(bunPath)) {
+    const existingRevision = await getRevision(bunPath);
+    if (existingRevision && isVersionMatch(existingRevision, options.version)) {
+      revision = existingRevision;
+      cacheHit = true; // Treat as cache hit to avoid unnecessary network requests
+      info(`Using existing Bun installation: ${revision}`);
     }
   }
 
-  if (!cacheHit) {
-    info(`Downloading a new version of Bun: ${url}`);
-    const zipPath = await downloadTool(url);
-    const extractedZipPath = await extractZip(zipPath);
-    const extractedBunPath = await extractBun(extractedZipPath);
-    try {
-      renameSync(extractedBunPath, bunPath);
-    } catch {
-      // If mv does not work, try to copy the file instead.
-      // For example: EXDEV: cross-device link not permitted
-      copyFileSync(extractedBunPath, bunPath);
+  if (!revision) {
+    if (cacheEnabled) {
+      const cacheKey = createHash("sha1").update(url).digest("base64");
+
+      const cacheRestored = await restoreCache([bunPath], cacheKey);
+      if (cacheRestored) {
+        revision = await getRevision(bunPath);
+        if (revision) {
+          cacheHit = true;
+          info(`Using a cached version of Bun: ${revision}`);
+        } else {
+          warning(
+            `Found a cached version of Bun: ${revision} (but it appears to be corrupted?)`,
+          );
+        }
+      }
+    }
+
+    if (!cacheHit) {
+      info(`Downloading a new version of Bun: ${url}`);
+      revision = await downloadBun(url, bunPath);
     }
-    revision = await getRevision(bunPath);
   }
 
   if (!revision) {
     throw new Error(
-      "Downloaded a new version of Bun, but failed to check its version? Try again."
+      "Downloaded a new version of Bun, but failed to check its version? Try again.",
     );
   }
 
-  if (cacheEnabled && !cacheHit) {
-    try {
-      await saveCache([bunPath], url);
-    } catch (error) {
-      warning("Failed to save Bun to cache.");
-    }
-  }
-
   const [version] = revision.split("+");
+
+  const cacheState: CacheState = {
+    cacheEnabled,
+    cacheHit,
+    bunPath,
+    url,
+  };
+
+  saveState("cache", JSON.stringify(cacheState));
+
   return {
     version,
     revision,
+    bunPath,
+    url,
     cacheHit,
   };
 };
 
+function isVersionMatch(
+  existingRevision: string,
+  requestedVersion?: string,
+): boolean {
+  // If no version specified, default is "latest" - don't match existing
+  if (!requestedVersion) {
+    return false;
+  }
+
+  // Non-pinned versions should never match existing installations
+  if (/^(latest|canary|action)$/i.test(requestedVersion)) {
+    return false;
+  }
+
+  const [existingVersion] = existingRevision.split("+");
+
+  const normalizeVersion = (v: string) => v.replace(/^v/i, "");
+
+  return (
+    normalizeVersion(existingVersion) === normalizeVersion(requestedVersion)
+  );
+}
+
+async function downloadBun(
+  url: string,
+  bunPath: string,
+): Promise<string | undefined> {
+  // Workaround for https://github.com/oven-sh/setup-bun/issues/79 and https://github.com/actions/toolkit/issues/1179
+  const zipPath = addExtension(await downloadTool(url), ".zip");
+  const extractedZipPath = await extractZip(zipPath);
+  const extractedBunPath = await extractBun(extractedZipPath);
+  try {
+    renameSync(extractedBunPath, bunPath);
+  } catch {
+    // If mv does not work, try to copy the file instead.
+    // For example: EXDEV: cross-device link not permitted
+    copyFileSync(extractedBunPath, bunPath);
+  }
+
+  return await getRevision(bunPath);
+}
+
 function isCacheEnabled(options: Input): boolean {
-  const { customUrl, version } = options;
+  const { customUrl, version, noCache } = options;
+  if (noCache) {
+    return false;
+  }
   if (customUrl) {
     return false;
   }
@@ -123,24 +194,6 @@ function isCacheEnabled(options: Input): boolean {
   return isFeatureAvailable();
 }
 
-function getDownloadUrl(options: Input): string {
-  const { customUrl } = options;
-  if (customUrl) {
-    return customUrl;
-  }
-  const { version, os, arch, avx2, profile } = options;
-  const eversion = encodeURIComponent(version ?? "latest");
-  const eos = encodeURIComponent(os ?? process.platform);
-  const earch = encodeURIComponent(arch ?? process.arch);
-  const eavx2 = encodeURIComponent(avx2 ?? true);
-  const eprofile = encodeURIComponent(profile ?? false);
-  const { href } = new URL(
-    `${eversion}/${eos}/${earch}?avx2=${eavx2}&profile=${eprofile}`,
-    "https://bun.sh/download/"
-  );
-  return href;
-}
-
 async function extractBun(path: string): Promise<string> {
   for (const entry of readdirSync(path, { withFileTypes: true })) {
     const { name } = entry;

src/bunfig.ts

@@ -1,50 +1,81 @@
-import { EOL } from "node:os";
-import { appendFileSync } from "node:fs";
+import { existsSync, readFileSync, writeFileSync } from "node:fs";
 import { info } from "@actions/core";
+import { parse, stringify } from "@iarna/toml";
+import { Registry } from "./registry";
 
-type BunfigOptions = {
-  registryUrl?: string;
-  scope?: string;
+type BunfigConfig = {
+  install?: {
+    registry?: {
+      url: string;
+      token?: string;
+    };
+    scopes?: Record<string, { url: string; token?: string }>;
+  };
+  [key: string]: any;
 };
 
-export function createBunfig(options: BunfigOptions): string | null {
-  const { registryUrl, scope } = options;
-
-  let url: URL | undefined;
-  if (registryUrl) {
-    try {
-      url = new URL(registryUrl);
-    } catch {
-      throw new Error(`Invalid registry-url: ${registryUrl}`);
-    }
-  }
-
-  let owner: string | undefined;
-  if (scope) {
-    owner = scope.startsWith("@")
-      ? scope.toLocaleLowerCase()
-      : `@${scope.toLocaleLowerCase()}`;
-  }
-
-  if (url && owner) {
-    return `[install.scopes]${EOL}'${owner}' = { token = "$BUN_AUTH_TOKEN", url = "${url}"}${EOL}`;
-  }
-
-  if (url && !owner) {
-    return `[install]${EOL}registry = "${url}"${EOL}`;
-  }
-
-  return null;
-}
-
-export function writeBunfig(path: string, options: BunfigOptions): void {
-  const bunfig = createBunfig(options);
-  if (!bunfig) {
+export function writeBunfig(path: string, registries: Registry[]): void {
+  if (!registries.length) {
     return;
   }
 
-  info(`Writing bunfig.toml to '${path}'.`);
-  appendFileSync(path, bunfig, {
-    encoding: "utf8",
+  let globalRegistryCount = 0;
+  registries.forEach((registry) => {
+    try {
+      new URL(registry.url);
+    } catch {
+      throw new Error(`Invalid registry URL: ${registry.url}`);
+    }
+
+    if (!registry.scope) {
+      globalRegistryCount++;
+    }
   });
+
+  if (globalRegistryCount > 1) {
+    throw new Error("You can't have more than one global registry.");
+  }
+
+  info(`Writing bunfig.toml to '${path}'.`);
+
+  let config: BunfigConfig = {};
+  if (existsSync(path)) {
+    try {
+      const content = readFileSync(path, { encoding: "utf-8" });
+      config = parse(content) as BunfigConfig;
+    } catch (error) {
+      info(`Error reading existing bunfig: ${error.message}`);
+      config = {};
+    }
+  }
+
+  config.install = config?.install || {};
+  config.install.scopes = config?.install.scopes || {};
+
+  const globalRegistry = registries.find((r) => !r.scope);
+  if (globalRegistry) {
+    config.install.registry = {
+      url: globalRegistry.url,
+      ...(globalRegistry.token ? { token: globalRegistry.token } : {}),
+    };
+  }
+
+  for (const registry of registries) {
+    if (registry.scope) {
+      const scopeName = registry.scope.startsWith("@")
+        ? registry.scope.toLowerCase()
+        : `@${registry.scope.toLowerCase()}`;
+
+      config.install.scopes[scopeName] = {
+        url: registry.url,
+        ...(registry.token ? { token: registry.token } : {}),
+      };
+    }
+  }
+
+  if (Object.keys(config.install.scopes).length === 0) {
+    delete config.install.scopes;
+  }
+
+  writeFileSync(path, stringify(config), { encoding: "utf8" });
 }

src/cache-save.ts

@@ -0,0 +1,17 @@
+import { saveCache } from "@actions/cache";
+import { getState, warning } from "@actions/core";
+import { CacheState } from "./action";
+import { createHash } from "node:crypto";
+(async () => {
+  const state: CacheState = JSON.parse(getState("cache"));
+  if (state.cacheEnabled && !state.cacheHit) {
+    const cacheKey = createHash("sha1").update(state.url).digest("base64");
+
+    try {
+      await saveCache([state.bunPath], cacheKey);
+      process.exit(0);
+    } catch (error) {
+      warning("Failed to save Bun to cache.");
+    }
+  }
+})();

src/download-url.ts

@@ -0,0 +1,69 @@
+import { compareVersions, satisfies, validate } from "compare-versions";
+import { Input } from "./action";
+import { getArchitecture, getAvx2, getPlatform, request } from "./utils";
+
+export async function getDownloadUrl(options: Input): Promise<string> {
+  const { customUrl } = options;
+  if (customUrl) {
+    return customUrl;
+  }
+
+  return await getSemverDownloadUrl(options);
+}
+
+async function getSemverDownloadUrl(options: Input): Promise<string> {
+  const res = (await (
+    await request("https://api.github.com/repos/oven-sh/bun/git/refs/tags", {
+      headers: options.token
+        ? { "Authorization": `Bearer ${options.token}` }
+        : {},
+    })
+  ).json()) as { ref: string }[];
+
+  let tags = res
+    .filter(
+      (tag) =>
+        tag.ref.startsWith("refs/tags/bun-v") || tag.ref === "refs/tags/canary",
+    )
+    .map((item) => item.ref.replace(/refs\/tags\/(bun-v)?/g, ""))
+    .filter(Boolean);
+
+  const { version, os, arch, avx2, profile } = options;
+
+  let tag = tags.find((t) => t === version);
+  if (!tag) {
+    tags = tags.filter((t) => validate(t)).sort(compareVersions);
+
+    const matchedTag =
+      version === "latest" || !version
+        ? tags.at(-1)
+        : tags.filter((t) => satisfies(t, version)).at(-1);
+
+    if (!matchedTag) {
+      throw new Error(`No Bun release found matching version '${version}'`);
+    }
+
+    tag = `bun-v${matchedTag}`;
+  } else if (validate(tag)) {
+    tag = `bun-v${tag}`;
+  }
+
+  const eversion = encodeURIComponent(tag ?? version);
+  const eos = encodeURIComponent(os ?? getPlatform());
+  const earch = encodeURIComponent(
+    getArchitecture(os ?? getPlatform(), arch ?? process.arch),
+  );
+  const eavx2 = encodeURIComponent(
+    getAvx2(os ?? getPlatform(), arch ?? process.arch, avx2) === false
+      ? "-baseline"
+      : "",
+  );
+  const eprofile = encodeURIComponent(profile === true ? "-profile" : "");
+
+  const { href } = new URL(
+    `${eversion}/bun-${eos}-${earch}${eavx2}${eprofile}.zip`,
+    "https://github.com/oven-sh/bun/releases/download/",
+  );
+
+  return href;
+}

src/index.ts

@@ -1,46 +1,47 @@
 import { tmpdir } from "node:os";
-import { join } from "node:path";
-import { existsSync, readFileSync } from "node:fs";
-import { getInput, setOutput, setFailed, warning } from "@actions/core";
+import { getInput, setOutput, setFailed, getBooleanInput } from "@actions/core";
 import runAction from "./action.js";
+import { readVersionFromFile } from "./utils.js";
+import { parseRegistries } from "./registry.js";
 
 if (!process.env.RUNNER_TEMP) {
   process.env.RUNNER_TEMP = tmpdir();
 }
 
-function readVersionFromPackageJson(): string | undefined {
-  const cwd = process.env.GITHUB_WORKSPACE;
-  if (!cwd) {
-    return;
-  }
-  const path = join(cwd, "package.json");
-  try {
-    if (!existsSync(path)) {
-      return;
-    }
-    const { packageManager } = JSON.parse(readFileSync(path, "utf8"));
-    if (!packageManager?.includes("bun@")) {
-      return;
-    }
-    const [_, version] = packageManager.split("bun@");
-    return version;
-  } catch (error) {
-    const { message } = error as Error;
-    warning(`Failed to read package.json: ${message}`);
-  }
+const registries = parseRegistries(getInput("registries"));
+
+// Backwards compatibility for the `registry-url` and `scope` inputs
+const registryUrl = getInput("registry-url");
+const scope = getInput("scope");
+
+if (registryUrl) {
+  registries.push({
+    url: registryUrl,
+    scope: scope,
+    token: "$BUN_AUTH_TOKEN",
+  });
 }
 
 runAction({
-  version: getInput("bun-version") || readVersionFromPackageJson() || undefined,
+  version:
+    getInput("bun-version") ||
+    readVersionFromFile(getInput("bun-version-file")) ||
+    readVersionFromFile("package.json", true) ||
+    undefined,
   customUrl: getInput("bun-download-url") || undefined,
-  registryUrl: getInput("registry-url") || undefined,
-  scope: getInput("scope") || undefined,
+  registries: registries,
+  noCache: getBooleanInput("no-cache") || false,
+  token: getInput("token"),
 })
-  .then(({ version, revision, cacheHit }) => {
+  .then(({ version, revision, bunPath, url, cacheHit }) => {
     setOutput("bun-version", version);
     setOutput("bun-revision", revision);
+    setOutput("bun-path", bunPath);
+    setOutput("bun-download-url", url);
     setOutput("cache-hit", cacheHit);
+    process.exit(0);
   })
   .catch((error) => {
     setFailed(error);
+    process.exit(1);
   });

src/registry.ts

@@ -0,0 +1,62 @@
+export type Registry = {
+  url: string;
+  scope: string;
+  token?: string;
+};
+
+/**
+ * Parse registries from the simplified format:
+ * - Default registry: https://registry.npmjs.org/
+ * - Default registry with token: https://registry.npmjs.org/|token123
+ * - With scope and credentials in URL: @myorg:https://username:password@registry.myorg.com/
+ * - With scope and separate token: @partner:https://registry.partner.com/|basic_token
+ */
+export function parseRegistries(input: string): Registry[] {
+  if (!input?.trim()) return [];
+
+  return input
+    .split("\n")
+    .map((line) => line.trim())
+    .filter(Boolean)
+    .map(parseLine)
+    .filter(Boolean) as Registry[];
+}
+
+function parseLine(line: string): Registry | null {
+  const scopeMatch = line.match(
+    /^(@[a-z0-9-_.]+|[a-z0-9-_.]+(?=:[a-z]+:\/\/)):(.+)$/i,
+  );
+
+  if (scopeMatch) {
+    const scope = scopeMatch[1];
+    const urlPart = scopeMatch[2].trim();
+
+    const [url, token] = urlPart.split("|", 2).map((p) => p?.trim());
+
+    try {
+      new URL(url);
+
+      return {
+        url,
+        scope,
+        ...(token && { token }),
+      };
+    } catch (e) {
+      throw new Error(`Invalid URL in registry configuration: ${url}`);
+    }
+  } else {
+    const [url, token] = line.split("|", 2).map((p) => p?.trim());
+
+    try {
+      new URL(url);
+
+      return {
+        url,
+        scope: "",
+        ...(token && { token }),
+      };
+    } catch (e) {
+      throw new Error(`Invalid URL in registry configuration: ${url}`);
+    }
+  }
+}

src/utils.ts

@@ -0,0 +1,131 @@
+import { debug, warning } from "@actions/core";
+import { info } from "node:console";
+import { existsSync, readFileSync, renameSync } from "node:fs";
+import { resolve, basename } from "node:path";
+
+export async function request(
+  url: string,
+  init?: RequestInit,
+): Promise<Response> {
+  const headers = new Headers(init?.headers);
+  if (!headers.has("User-Agent")) {
+    headers.set("User-Agent", "@oven-sh/setup-bun");
+  }
+
+  const res = await fetch(url, {
+    ...init,
+    headers,
+  });
+  if (!res.ok) {
+    const body = await res.text().catch(() => "");
+    throw new Error(
+      `Failed to fetch url ${url}. (status code: ${res.status}, status text: ${res.statusText})${body ? `\n${body}` : ""}`,
+    );
+  }
+
+  return res;
+}
+
+export function addExtension(path: string, ext: string): string {
+  if (!path.endsWith(ext)) {
+    renameSync(path, path + ext);
+    return path + ext;
+  }
+
+  return path;
+}
+
+export function getPlatform(): string {
+  const platform = process.platform;
+  if (platform === "win32") return "windows";
+
+  return platform;
+}
+
+export function getArchitecture(os: string, arch: string): string {
+  if (os === "windows" && (arch === "aarch64" || arch === "arm64")) {
+    warning(
+      [
+        "⚠️ Bun does not provide native arm64 builds for Windows.",
+        "Using x64 baseline build which will run through Microsoft's x64 emulation layer.",
+        "This may result in reduced performance and potential compatibility issues.",
+        "💡 For best performance, consider using x64 Windows runners or other platforms with native support.",
+      ].join("\n"),
+    );
+
+    return "x64";
+  }
+
+  if (arch === "arm64") return "aarch64";
+  return arch;
+}
+
+export function getAvx2(os: string, arch: string, avx2?: boolean): boolean {
+  // Temporary workaround for absence of arm64 builds on Windows (#130)
+  if (os === "windows" && (arch === "aarch64" || arch === "arm64")) {
+    return false;
+  }
+
+  return avx2 ?? true;
+}
+
+const FILE_VERSION_READERS = {
+  "package.json": (content: string) => {
+    const pkg = JSON.parse(content);
+    return pkg.packageManager?.split("bun@")?.[1] ?? pkg.engines?.bun;
+  },
+  ".tool-versions": (content: string) =>
+    content.match(/^bun\s*(?<version>.*?)$/m)?.groups?.version,
+  ".bumrc": (content: string) => content, // https://github.com/owenizedd/bum
+  ".bun-version": (content: string) => content,
+};
+
+export function readVersionFromFile(
+  file: string,
+  silent = false,
+): string | undefined {
+  const cwd = process.env.GITHUB_WORKSPACE;
+  if (!cwd) {
+    return;
+  }
+
+  if (!file) {
+    return;
+  }
+
+  debug(`Reading version from ${file}`);
+
+  const path = resolve(cwd, file);
+  const base = basename(file);
+
+  if (!existsSync(path)) {
+    if (!silent) {
+      warning(`File ${path} not found`);
+    }
+    return;
+  }
+
+  const reader = FILE_VERSION_READERS[base] ?? (() => undefined);
+
+  let output: string | undefined;
+  try {
+    output = reader(readFileSync(path, "utf8"))?.trim();
+
+    if (!output) {
+      if (!silent) {
+        warning(`Failed to read version from ${file}`);
+      }
+      return;
+    }
+  } catch (error) {
+    const { message } = error as Error;
+    if (!silent) {
+      warning(`Failed to read ${file}: ${message}`);
+    }
+  } finally {
+    if (output) {
+      info(`Obtained version ${output} from ${file}`);
+      return output;
+    }
+  }
+}

tests/bunfig.spec.ts

@@ -0,0 +1,291 @@
+import { afterEach, describe, expect, it } from "bun:test";
+import { existsSync, unlinkSync } from "node:fs";
+import { writeBunfig } from "../src/bunfig";
+import { EOL } from "os";
+
+describe("writeBunfig", () => {
+  const filePath = "bunfig_test.toml";
+
+  async function getFileAndContents() {
+    const file = Bun.file(filePath);
+    const contents = (await file.text()).split(EOL);
+
+    return { file, contents };
+  }
+
+  afterEach(() => {
+    if (existsSync(filePath)) unlinkSync(filePath);
+    console.log(`${filePath} was deleted`);
+  });
+
+  describe("when no bunfig_test.toml file exists", () => {
+    it("should create a new file with scopes content", async () => {
+      writeBunfig(filePath, [
+        {
+          url: "https://npm.pkg.github.com",
+          scope: "foo-bar",
+          token: "$BUN_AUTH_TOKEN",
+        },
+      ]);
+
+      const { file, contents } = await getFileAndContents();
+
+      expect(file.exists()).resolves.toBeTrue();
+
+      const expectedContents = [
+        '[install.scopes."@foo-bar"]',
+        'url = "https://npm.pkg.github.com"',
+        'token = "$BUN_AUTH_TOKEN"',
+        "",
+      ];
+
+      contents.forEach((content, index) =>
+        expect(content).toBe(expectedContents[index])
+      );
+
+      expect(contents.length).toBe(expectedContents.length);
+    });
+
+    it("should create a new file with global registry", async () => {
+      writeBunfig(filePath, [
+        {
+          url: "https://npm.pkg.github.com",
+          scope: "",
+        },
+      ]);
+
+      const { file, contents } = await getFileAndContents();
+
+      expect(file.exists()).resolves.toBeTrue();
+
+      const expectedContents = [
+        "[install.registry]",
+        'url = "https://npm.pkg.github.com"',
+        "",
+      ];
+
+      contents.forEach((content, index) =>
+        expect(content).toBe(expectedContents[index])
+      );
+
+      expect(contents.length).toBe(expectedContents.length);
+    });
+
+    it("should create a new file with global registry & token", async () => {
+      writeBunfig(filePath, [
+        {
+          url: "https://npm.pkg.github.com",
+          scope: "",
+          token: "$BUN_AUTH_TOKEN",
+        },
+      ]);
+
+      const { file, contents } = await getFileAndContents();
+
+      expect(file.exists()).resolves.toBeTrue();
+
+      const expectedContents = [
+        "[install.registry]",
+        'url = "https://npm.pkg.github.com"',
+        'token = "$BUN_AUTH_TOKEN"',
+        "",
+      ];
+
+      contents.forEach((content, index) =>
+        expect(content).toBe(expectedContents[index])
+      );
+
+      expect(contents.length).toBe(expectedContents.length);
+    });
+  });
+
+  describe("when local bunfig_test.toml file exists", () => {
+    it("and no [install.scopes] exists, should concatenate file correctly", async () => {
+      const bunfig = `[install]${EOL}optional = true${EOL}${EOL}[install.cache]${EOL}disable = true`;
+
+      await Bun.write(filePath, bunfig);
+
+      writeBunfig(filePath, [
+        {
+          url: "https://npm.pkg.github.com",
+          scope: "foo-bar",
+          token: "$BUN_AUTH_TOKEN",
+        },
+      ]);
+
+      const { file, contents } = await getFileAndContents();
+
+      expect(file.exists()).resolves.toBeTrue();
+
+      const expectedContents = [
+        "[install]",
+        "optional = true",
+        "",
+        "  [install.cache]",
+        "  disable = true",
+        "",
+        '[install.scopes."@foo-bar"]',
+        'url = "https://npm.pkg.github.com"',
+        'token = "$BUN_AUTH_TOKEN"',
+        "",
+      ];
+
+      contents.forEach((content, index) =>
+        expect(content).toBe(expectedContents[index])
+      );
+
+      expect(contents.length).toBe(expectedContents.length);
+    });
+
+    it("and [install.scopes] exists and it's not the same registry, should concatenate file correctly", async () => {
+      const bunfig = `[install]${EOL}optional = true${EOL}${EOL}[install.scopes]${EOL}'@bla-ble' = { token = "$BUN_AUTH_TOKEN", url = "https://npm.pkg.github.com/" }${EOL}${EOL}[install.cache]${EOL}disable = true`;
+
+      await Bun.write(filePath, bunfig);
+
+      writeBunfig(filePath, [
+        {
+          url: "https://npm.pkg.github.com",
+          scope: "foo-bar",
+          token: "$BUN_AUTH_TOKEN",
+        },
+      ]);
+
+      const { file, contents } = await getFileAndContents();
+
+      expect(file.exists()).resolves.toBeTrue();
+
+      const expectedContents = [
+        "[install]",
+        "optional = true",
+        "",
+        '[install.scopes."@bla-ble"]',
+        'token = "$BUN_AUTH_TOKEN"',
+        'url = "https://npm.pkg.github.com/"',
+        "",
+        '[install.scopes."@foo-bar"]',
+        'url = "https://npm.pkg.github.com"',
+        'token = "$BUN_AUTH_TOKEN"',
+        "",
+        "  [install.cache]",
+        "  disable = true",
+        "",
+      ];
+
+      contents.forEach((content, index) =>
+        expect(content).toBe(expectedContents[index])
+      );
+
+      expect(contents.length).toBe(expectedContents.length);
+    });
+
+    it("and [install.scopes] exists and it's the same registry, should concatenate file correctly", async () => {
+      const bunfig = `[install]${EOL}optional = true${EOL}${EOL}[install.scopes]${EOL}'@foo-bar' = { token = "$BUN_AUTH_TOKEN", url = "https://npm.pkg.github.com/" }${EOL}'@bla-ble' = { token = "$BUN_AUTH_TOKEN", url = "https://npm.pkg.github.com/" }${EOL}${EOL}[install.cache]${EOL}disable = true`;
+
+      await Bun.write(filePath, bunfig);
+
+      writeBunfig(filePath, [
+        {
+          url: "https://npm.pkg.github.com",
+          scope: "foo-bar",
+          token: "$BUN_AUTH_TOKEN",
+        },
+      ]);
+
+      const { file, contents } = await getFileAndContents();
+
+      expect(file.exists()).resolves.toBeTrue();
+
+      const expectedContents = [
+        "[install]",
+        "optional = true",
+        "",
+        '[install.scopes."@foo-bar"]',
+        'url = "https://npm.pkg.github.com"',
+        'token = "$BUN_AUTH_TOKEN"',
+        "",
+        '[install.scopes."@bla-ble"]',
+        'token = "$BUN_AUTH_TOKEN"',
+        'url = "https://npm.pkg.github.com/"',
+        "",
+        "  [install.cache]",
+        "  disable = true",
+        "",
+      ];
+
+      contents.forEach((content, index) =>
+        expect(content).toBe(expectedContents[index])
+      );
+
+      expect(contents.length).toBe(expectedContents.length);
+    });
+
+    it("and [install.scopes] and [install] exists, should concantenate file correctly", async () => {
+      const bunfig = `[install]${EOL}optional = true${EOL}${EOL}[install.scopes]${EOL}'@foo-bar' = { token = "$BUN_AUTH_TOKEN", url = "https://npm.pkg.github.com/" }${EOL}'@bla-ble' = { token = "$BUN_AUTH_TOKEN", url = "https://npm.pkg.github.com/" }${EOL}${EOL}[install.cache]${EOL}disable = true`;
+
+      await Bun.write(filePath, bunfig);
+
+      writeBunfig(filePath, [
+        {
+          url: "https://npm.pkg.github.com",
+          scope: "foo-bar",
+          token: "$BUN_AUTH_TOKEN",
+        },
+        {
+          url: "https://bun.sh",
+          scope: "",
+          token: "$BUN_AUTH_TOKEN",
+        }, // global registry
+      ]);
+
+      const { file, contents } = await getFileAndContents();
+
+      expect(file.exists()).resolves.toBeTrue();
+
+      const expectedContents = [
+        "[install]",
+        "optional = true",
+        "",
+        '[install.scopes."@foo-bar"]',
+        'url = "https://npm.pkg.github.com"',
+        'token = "$BUN_AUTH_TOKEN"',
+        "",
+        '[install.scopes."@bla-ble"]',
+        'token = "$BUN_AUTH_TOKEN"',
+        'url = "https://npm.pkg.github.com/"',
+        "",
+        "  [install.cache]",
+        "  disable = true",
+        "",
+        "  [install.registry]",
+        '  url = "https://bun.sh"',
+        '  token = "$BUN_AUTH_TOKEN"',
+        "",
+      ];
+
+      contents.forEach((content, index) =>
+        expect(content).toBe(expectedContents[index])
+      );
+
+      expect(contents.length).toBe(expectedContents.length);
+    });
+  });
+
+  describe("when multiple global registries are provided", () => {
+    it("should throw an error", () => {
+      expect(() => {
+        writeBunfig(filePath, [
+          {
+            url: "https://npm.pkg.github.com",
+            scope: "",
+            token: "$BUN_AUTH_TOKEN",
+          },
+          {
+            url: "https://bun.sh",
+            scope: "",
+            token: "$BUN_AUTH_TOKEN",
+          },
+        ]);
+      }).toThrow("You can't have more than one global registry.");
+    });
+  });
+});

tests/registry.spec.ts

@@ -0,0 +1,170 @@
+import { describe, expect, it } from "bun:test";
+import { parseRegistries } from "../src/registry";
+
+describe("registry", () => {
+  describe("parseRegistries", () => {
+    it("should return an empty array for empty input", () => {
+      expect(parseRegistries("")).toEqual([]);
+      expect(parseRegistries("   ")).toEqual([]);
+      expect(parseRegistries(null as any)).toEqual([]);
+      expect(parseRegistries(undefined as any)).toEqual([]);
+    });
+
+    it("should parse default registry without token", () => {
+      const input = "https://registry.npmjs.org/";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.npmjs.org/",
+          scope: "",
+        },
+      ]);
+    });
+
+    it("should parse default registry with token", () => {
+      const input = "https://registry.npmjs.org/|npm_token123";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.npmjs.org/",
+          scope: "",
+          token: "npm_token123",
+        },
+      ]);
+    });
+
+    it("should parse scoped registry with URL credentials", () => {
+      const input = "@myorg:https://username:password@registry.myorg.com/";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://username:password@registry.myorg.com/",
+          scope: "@myorg",
+        },
+      ]);
+    });
+
+    it("should parse scoped registry with separate token", () => {
+      const input = "@partner:https://registry.partner.com/|token_abc123";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.partner.com/",
+          scope: "@partner",
+          token: "token_abc123",
+        },
+      ]);
+    });
+
+    it("should parse multiple registries", () => {
+      const input = `
+        https://registry.npmjs.org/
+        @myorg:https://username:password@registry.myorg.com/
+        @partner:https://registry.partner.com/|token_abc123
+      `;
+
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.npmjs.org/",
+          scope: "",
+        },
+        {
+          url: "https://username:password@registry.myorg.com/",
+          scope: "@myorg",
+        },
+        {
+          url: "https://registry.partner.com/",
+          scope: "@partner",
+          token: "token_abc123",
+        },
+      ]);
+    });
+
+    it("should handle scope names without @ prefix", () => {
+      const input = "myorg:https://registry.myorg.com/|token123";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.myorg.com/",
+          scope: "myorg",
+          token: "token123",
+        },
+      ]);
+    });
+
+    it("should throw error for invalid URLs", () => {
+      expect(() => {
+        parseRegistries("@myorg:not-a-valid-url");
+      }).toThrow("Invalid URL in registry configuration: not-a-valid-url");
+
+      expect(() => {
+        parseRegistries("also-not-a-valid-url");
+      }).toThrow("Invalid URL in registry configuration: also-not-a-valid-url");
+    });
+
+    it("should handle whitespace and empty lines", () => {
+      const input = `
+
+        https://registry.npmjs.org/
+
+        @myorg:https://registry.myorg.com/|token123
+
+      `;
+
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.npmjs.org/",
+          scope: "",
+        },
+        {
+          url: "https://registry.myorg.com/",
+          scope: "@myorg",
+          token: "token123",
+        },
+      ]);
+    });
+
+    it("should handle URLs with paths and query parameters", () => {
+      const input =
+        "@myorg:https://registry.myorg.com/npm/registry/?timeout=5000|token123";
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.myorg.com/npm/registry/?timeout=5000",
+          scope: "@myorg",
+          token: "token123",
+        },
+      ]);
+    });
+
+    it("should correctly handle scopes with hyphens and underscores", () => {
+      const input = `
+        @my-org:https://registry.myorg.com/
+        @my_org:https://registry.myorg.com/
+      `;
+
+      const result = parseRegistries(input);
+
+      expect(result).toEqual([
+        {
+          url: "https://registry.myorg.com/",
+          scope: "@my-org",
+        },
+        {
+          url: "https://registry.myorg.com/",
+          scope: "@my_org",
+        },
+      ]);
+    });
+  });
+});

tests/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "types": [
+      "bun"
+    ]
+  }
+}

tests/utils.spec.ts

@@ -0,0 +1,124 @@
+import { afterEach, describe, expect, it, spyOn } from "bun:test";
+import { getArchitecture, getAvx2 } from "../src/utils";
+import * as core from "@actions/core";
+
+describe("getArchitecture", () => {
+  let warningSpy: ReturnType<typeof spyOn>;
+
+  afterEach(() => {
+    warningSpy?.mockRestore();
+  });
+
+  it("should return x64 for Windows with arm64 architecture", () => {
+    warningSpy = spyOn(core, "warning");
+    const result = getArchitecture("windows", "arm64");
+
+    expect(result).toBe("x64");
+    expect(warningSpy).toHaveBeenCalledTimes(1);
+    expect(warningSpy).toHaveBeenCalledWith(
+      expect.stringContaining(
+        "⚠️ Bun does not provide native arm64 builds for Windows."
+      )
+    );
+  });
+
+  it("should return x64 for Windows with aarch64 architecture", () => {
+    warningSpy = spyOn(core, "warning");
+    const result = getArchitecture("windows", "aarch64");
+
+    expect(result).toBe("x64");
+    expect(warningSpy).toHaveBeenCalledTimes(1);
+    expect(warningSpy).toHaveBeenCalledWith(
+      expect.stringContaining(
+        "⚠️ Bun does not provide native arm64 builds for Windows."
+      )
+    );
+  });
+
+  it("should return aarch64 for non-Windows platforms with arm64", () => {
+    warningSpy = spyOn(core, "warning");
+    const result = getArchitecture("linux", "arm64");
+
+    expect(result).toBe("aarch64");
+    expect(warningSpy).not.toHaveBeenCalled();
+  });
+
+  it("should return aarch64 for macOS with arm64", () => {
+    warningSpy = spyOn(core, "warning");
+    const result = getArchitecture("darwin", "arm64");
+
+    expect(result).toBe("aarch64");
+    expect(warningSpy).not.toHaveBeenCalled();
+  });
+
+  it("should return original arch value for x64", () => {
+    warningSpy = spyOn(core, "warning");
+    const result = getArchitecture("windows", "x64");
+
+    expect(result).toBe("x64");
+    expect(warningSpy).not.toHaveBeenCalled();
+  });
+
+  it("should return original arch value for x86", () => {
+    warningSpy = spyOn(core, "warning");
+    const result = getArchitecture("linux", "x86");
+
+    expect(result).toBe("x86");
+    expect(warningSpy).not.toHaveBeenCalled();
+  });
+
+  it("should return original arch value for aarch64 on Linux", () => {
+    warningSpy = spyOn(core, "warning");
+    const result = getArchitecture("linux", "aarch64");
+
+    expect(result).toBe("aarch64");
+    expect(warningSpy).not.toHaveBeenCalled();
+  });
+});
+
+describe("getAvx2", () => {
+  it("should return false when called with os: 'windows' and arch: 'arm64'", () => {
+    const result = getAvx2("windows", "arm64");
+    expect(result).toBe(false);
+  });
+
+  it("should return false when called with os: 'windows' and arch: 'aarch64'", () => {
+    const result = getAvx2("windows", "aarch64");
+    expect(result).toBe(false);
+  });
+
+  it("should return false when called with os: 'windows', arch: 'arm64', and avx2: true", () => {
+    const result = getAvx2("windows", "arm64", true);
+    expect(result).toBe(false);
+  });
+
+  it("should return false when called with os: 'windows', arch: 'aarch64', and avx2: false", () => {
+    const result = getAvx2("windows", "aarch64", false);
+    expect(result).toBe(false);
+  });
+
+  it("should return the provided avx2 value (true) when specified and not on Windows ARM64", () => {
+    expect(getAvx2("linux", "x64", true)).toBe(true);
+    expect(getAvx2("darwin", "x64", true)).toBe(true);
+    expect(getAvx2("windows", "x64", true)).toBe(true);
+  });
+
+  it("should return the provided avx2 value (false) when specified and not on Windows ARM64", () => {
+    expect(getAvx2("linux", "x64", false)).toBe(false);
+    expect(getAvx2("darwin", "x64", false)).toBe(false);
+    expect(getAvx2("windows", "x64", false)).toBe(false);
+  });
+
+  it("should return true by default when avx2 is not specified and not on Windows ARM64", () => {
+    // x64 architecture on various platforms
+    expect(getAvx2("linux", "x64")).toBe(true);
+    expect(getAvx2("darwin", "x64")).toBe(true);
+    expect(getAvx2("windows", "x64")).toBe(true);
+
+    // ARM architecture on non-Windows platforms
+    expect(getAvx2("linux", "arm64")).toBe(true);
+    expect(getAvx2("linux", "aarch64")).toBe(true);
+    expect(getAvx2("darwin", "arm64")).toBe(true);
+    expect(getAvx2("darwin", "aarch64")).toBe(true);
+  });
+});