chore: Rework deduplication github actions

.github/actions/deduplicate/action.yml

@@ -0,0 +1,24 @@
+name: 'Deduplicate'
+
+inputs:
+  strategy:
+    description: 'yarn-deduplicate strategy'
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - name: Run yarn-deduplicate (highest)
+      if: ${{ env.STRATEGY == 'highest' }}
+      run: |
+        yarn global add yarn-deduplicate
+        yarn-deduplicate --strategy highest
+        yarn-deduplicate --strategy fewer --packages @types/node # @types/node@* causes unneeded duplication in highest mode
+        yarn
+
+    - name: Run yarn-deduplicate (fewer)
+      if: ${{ env.STRATEGY == 'fewer' }}
+      run: |
+        yarn global add yarn-deduplicate
+        yarn-deduplicate --strategy fewer --exclude @types/unist # @types/unist gets downgraded in this mode
+        yarn

.github/workflows/check-pr.yml

@@ -43,10 +43,9 @@ jobs:
       - name: 'Prepare workflow'
         uses: ./.github/actions/prepare
       - name: 'Deduplicate dependencies'
-        run: |
-          yarn global add yarn-deduplicate
-          yarn-deduplicate
-          yarn
+        uses: ./.github/actions/deduplicate
+        with:
+          strategy: 'highest'
       - name: 'Verify yarn.lock is intact'
         run: git diff --exit-code yarn.lock
       - name: 'Notify of duplicates'

.github/workflows/deduplicate.yml

@@ -38,13 +38,10 @@ jobs:
       - name: 'Prepare workflow'
         uses: ./.github/actions/prepare
 
-      - name: Run yarn-deduplicate
-        env:
-          ARGS: ${{ contains(github.event.comment.body, 'fewer') && '--exclude @types/unist' || '' }}
-        run: |
-          yarn global add yarn-deduplicate
-          yarn-deduplicate --strategy $STRATEGY $ARGS
-          yarn
+      - name: 'Deduplicate dependencies'
+        uses: ./.github/actions/deduplicate
+        with:
+          strategy: ${{ env.STRATEGY }}
 
       - name: Commit changes
         run: |