ci: bundle diff report

.github/workflows/bundle-diff.yml

@@ -0,0 +1,106 @@
+name: Bundle diff
+
+on: [pull_request]
+
+jobs:
+  build-base:
+    name: Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.base_ref }}
+
+      - name: Setup Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 16
+
+      - name: Install dependencies
+        uses: bahmutov/npm-install@v1
+
+      - name: Build project
+        run: npm run build
+
+      - name: Upload base stats.json
+        uses: actions/upload-artifact@v2
+        with:
+          name: base
+          path: ./dist/stats.json
+          retention-days: 1
+  build-pr:
+    name: Build PR
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Install dependencies
+      uses: bahmutov/npm-install@v1
+
+    - name: Build project
+      run: npm run build
+
+    - name: Upload base stats.json
+      uses: actions/upload-artifact@v2
+      with:
+        name: pr
+        path: ./dist/stats.json
+        retention-days: 1
+  report:
+    name: Generate report
+    runs-on: ubuntu-latest
+    needs: [build-base, build-pr]
+
+    steps:
+    - name: Checkout PR
+      uses: actions/checkout@v2
+
+    - name: Check if base artifact exists
+      uses: xSAVIKx/artifact-exists-action@v0
+      id: check_artifact
+      with:
+        name: 'base'
+
+    - name: Download base stats
+      if: steps.check_artifact.outputs.exists == 'true'
+      uses: actions/download-artifact@v2
+      with:
+        name: base
+        path: base
+
+    - name: Download base stats
+      if: steps.check_artifact.outputs.exists == 'true'
+      uses: actions/download-artifact@v2
+      with:
+        name: base
+        path: base
+
+    - name: Download PR stats
+      if: steps.check_artifact.outputs.exists == 'true'
+      uses: actions/download-artifact@v2
+      with:
+        name: pr
+        path: p
+
+    - name: Get diff
+      if: steps.check_artifact.outputs.exists == 'true'
+      id: get-diff
+      uses: NejcZdovc/bundle-size-diff@v1
+      with:
+        base_path: './base/stats.json'
+        pr_path: './pr/stats.json'
+
+    - name: Comment
+      if: steps.check_artifact.outputs.exists == 'true'
+      uses: NejcZdovc/comment-pr@v1.1.1
+      with:
+        file: 'comment.md'
+      env:
+        GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        OLD: ${{steps.get-diff.outputs.base_file_string}}
+        NEW: ${{steps.get-diff.outputs.pr_file_string}}
+        DIFF: ${{steps.get-diff.outputs.diff_file_string}}
+        DIFF_PERCENT: ${{steps.get-diff.outputs.percent}}