refactor(ci): Extract platform-check into a reusable composite action

.github/actions/platform-check/action.yml

@@ -0,0 +1,62 @@
+name: 'Platform Check'
+description: 'Decides whether to skip a build/test based on detect-changes outputs'
+
+inputs:
+  platform:
+    description: 'Target platform (ios, macos, android, web)'
+    required: true
+  sample_changed:
+    description: 'Whether the sample app itself changed (true/false)'
+    required: true
+  needs_ios:
+    description: 'detect-changes needs_ios output'
+    required: false
+    default: 'false'
+  needs_android:
+    description: 'detect-changes needs_android output'
+    required: false
+    default: 'false'
+  needs_web:
+    description: 'detect-changes needs_web output'
+    required: false
+    default: 'false'
+
+outputs:
+  skip:
+    description: 'Whether to skip this platform (true/false)'
+    value: ${{ steps.check.outputs.skip }}
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Check if platform is needed
+      id: check
+      shell: bash
+      run: |
+        PLATFORM="${{ inputs.platform }}"
+        SAMPLE_CHANGED="${{ inputs.sample_changed }}"
+
+        if [[ "$SAMPLE_CHANGED" == "true" ]]; then
+          echo "skip=false" >> "$GITHUB_OUTPUT"
+          echo "Sample app changed — building/testing $PLATFORM."
+          exit 0
+        fi
+
+        # macOS uses the iOS change-detection flag
+        case "$PLATFORM" in
+          ios|macos) NEEDS="${{ inputs.needs_ios }}" ;;
+          android)   NEEDS="${{ inputs.needs_android }}" ;;
+          web)       NEEDS="${{ inputs.needs_web }}" ;;
+          *)
+            echo "::warning::Unknown platform '$PLATFORM' — not skipping."
+            echo "skip=false" >> "$GITHUB_OUTPUT"
+            exit 0
+            ;;
+        esac
+
+        if [[ "$NEEDS" != "true" ]]; then
+          echo "skip=true" >> "$GITHUB_OUTPUT"
+          echo "Skipping $PLATFORM — no relevant changes detected."
+        else
+          echo "skip=false" >> "$GITHUB_OUTPUT"
+        fi

.github/workflows/sample-application-expo.yml

@@ -59,27 +59,17 @@ jobs:
           - platform: 'android'
             ios-use-frameworks: 'dynamic-frameworks'
     steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
       - name: Check if platform is needed
         id: platform-check
-        run: |
-          SAMPLE_CHANGED="${{ needs.detect-changes.outputs.sample_expo }}"
-
-          if [[ "$SAMPLE_CHANGED" == "true" ]]; then
-            echo "skip=false" >> "$GITHUB_OUTPUT"
-            echo "Sample app changed — building ${{ matrix.platform }}."
-          elif [[ "${{ matrix.platform }}" == "ios" && "${{ needs.detect-changes.outputs.needs_ios }}" != "true" ]]; then
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            echo "Skipping iOS — no relevant changes detected."
-          elif [[ "${{ matrix.platform }}" == "android" && "${{ needs.detect-changes.outputs.needs_android }}" != "true" ]]; then
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            echo "Skipping Android — no relevant changes detected."
-          elif [[ "${{ matrix.platform }}" == "web" && "${{ needs.detect-changes.outputs.needs_web }}" != "true" ]]; then
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            echo "Skipping Web — no relevant changes detected."
-          fi
-
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
-        if: ${{ steps.platform-check.outputs.skip != 'true' }}
+        uses: ./.github/actions/platform-check
+        with:
+          platform: ${{ matrix.platform }}
+          sample_changed: ${{ needs.detect-changes.outputs.sample_expo }}
+          needs_ios: ${{ needs.detect-changes.outputs.needs_ios }}
+          needs_android: ${{ needs.detect-changes.outputs.needs_android }}
+          needs_web: ${{ needs.detect-changes.outputs.needs_web }}
 
       - name: Enable Corepack (NPM)
         if: ${{ steps.platform-check.outputs.skip != 'true' && matrix.platform != 'ios' }}

.github/workflows/sample-application.yml

@@ -74,32 +74,16 @@ jobs:
           - ios-use-frameworks: 'dynamic-frameworks'
             platform: 'macos'
     steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
       - name: Check if platform is needed
         id: platform-check
-        run: |
-          # Sample app changes should always build all platforms (that's the
-          # whole point of this workflow).  The needs_ios/needs_android flags
-          # only track SDK source & native code — not sample app files.
-          SAMPLE_CHANGED="${{ needs.detect-changes.outputs.sample_react_native }}"
-
-          if [[ "$SAMPLE_CHANGED" == "true" ]]; then
-            echo "skip=false" >> "$GITHUB_OUTPUT"
-            echo "Sample app changed — building ${{ matrix.platform }}."
-          elif [[ "${{ matrix.platform }}" == "ios" && "${{ needs.detect-changes.outputs.needs_ios }}" != "true" ]]; then
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            echo "Skipping iOS — no relevant changes detected."
-          elif [[ "${{ matrix.platform }}" == "macos" && "${{ needs.detect-changes.outputs.needs_ios }}" != "true" ]]; then
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            echo "Skipping macOS — no relevant changes detected."
-          elif [[ "${{ matrix.platform }}" == "android" && "${{ needs.detect-changes.outputs.needs_android }}" != "true" ]]; then
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            echo "Skipping Android — no relevant changes detected."
-          else
-            echo "skip=false" >> "$GITHUB_OUTPUT"
-          fi
-
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
-        if: ${{ steps.platform-check.outputs.skip != 'true' }}
+        uses: ./.github/actions/platform-check
+        with:
+          platform: ${{ matrix.platform }}
+          sample_changed: ${{ needs.detect-changes.outputs.sample_react_native }}
+          needs_ios: ${{ needs.detect-changes.outputs.needs_ios }}
+          needs_android: ${{ needs.detect-changes.outputs.needs_android }}
 
       - name: Enable Corepack (NPM)
         if: ${{ steps.platform-check.outputs.skip != 'true' && matrix.platform == 'android' }}
@@ -264,26 +248,16 @@ jobs:
             build-type: 'production'
 
     steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
       - name: Check if platform is needed
         id: platform-check
-        run: |
-          SAMPLE_CHANGED="${{ needs.detect-changes.outputs.sample_react_native }}"
-
-          if [[ "$SAMPLE_CHANGED" == "true" ]]; then
-            echo "skip=false" >> "$GITHUB_OUTPUT"
-            echo "Sample app changed — testing ${{ matrix.platform }}."
-          elif [[ "${{ matrix.platform }}" == "ios" && "${{ needs.detect-changes.outputs.needs_ios }}" != "true" ]]; then
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            echo "Skipping iOS — no relevant changes detected."
-          elif [[ "${{ matrix.platform }}" == "android" && "${{ needs.detect-changes.outputs.needs_android }}" != "true" ]]; then
-            echo "skip=true" >> "$GITHUB_OUTPUT"
-            echo "Skipping Android — no relevant changes detected."
-          else
-            echo "skip=false" >> "$GITHUB_OUTPUT"
-          fi
-
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
-        if: ${{ steps.platform-check.outputs.skip != 'true' }}
+        uses: ./.github/actions/platform-check
+        with:
+          platform: ${{ matrix.platform }}
+          sample_changed: ${{ needs.detect-changes.outputs.sample_react_native }}
+          needs_ios: ${{ needs.detect-changes.outputs.needs_ios }}
+          needs_android: ${{ needs.detect-changes.outputs.needs_android }}
 
       - name: Install Maestro
         if: ${{ steps.platform-check.outputs.skip != 'true' }}