ci(app-shell): add packages/core coverage diff reporting with octocov

.github/workflows/ci-packages.yaml

@@ -1,6 +1,10 @@
 name: CI (packages)
 
 on:
+  push:
+    # Keep running on main so octocov can refresh the baseline artifact that PRs diff against.
+    branches:
+      - main
   pull_request:
 
 concurrency:
@@ -12,10 +16,13 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20
     permissions:
+      actions: write
       contents: read
+      pull-requests: write
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           fetch-depth: 2
           persist-credentials: false
       - uses: ./.github/actions/ci
+      - uses: k1LoW/octocov-action@a167dc0dee441b7ffc45e1b862ab55ec0d87f278 # v1.5.2

.gitignore

@@ -6,3 +6,4 @@ dist
 .cursor/
 .claude/
 .pnpm-store
+coverage

.octocov.yml

@@ -0,0 +1,18 @@
+coverage:
+  paths:
+    - packages/core/coverage/lcov.info
+comment:
+  if: is_pull_request
+  updatePrevious: true
+  hideFooterLink: true
+summary:
+  if: true
+  hideFooterLink: true
+report:
+  if: is_default_branch
+  datastores:
+    - artifact://${GITHUB_REPOSITORY}/packages-core-octocov
+diff:
+  if: is_pull_request
+  datastores:
+    - artifact://${GITHUB_REPOSITORY}/packages-core-octocov

packages/core/package.json

@@ -77,6 +77,7 @@
     "@types/react": "catalog:",
     "@types/react-dom": "catalog:",
     "@vitejs/plugin-react": "catalog:",
+    "@vitest/coverage-v8": "4.1.10",
     "happy-dom": "20.9.0",
     "postcss": "8.5.26",
     "react": "catalog:",

packages/core/vitest.config.ts

@@ -2,13 +2,21 @@ import path from "node:path";
 import { defineConfig } from "vitest/config";
 import tsconfigPaths from "vite-tsconfig-paths";
 
+const coverageEnabled = process.env.CI === "true";
+
 export default defineConfig({
   plugins: [tsconfigPaths()],
   test: {
     environment: "happy-dom",
     typecheck: {
       enabled: true,
     },
+    coverage: {
+      enabled: coverageEnabled,
+      provider: "v8",
+      reporter: ["lcov", "text-summary"],
+      reportsDirectory: "coverage",
+    },
     resolveSnapshotPath: (testPath, snapExtension) => {
       const relativePath = path.relative(__dirname, testPath);
       const snapshotName = relativePath.replaceAll(path.sep, "__");