ci: report coverage via vitest-coverage-report-action instead of codecov

Upload coverage to a PR comment / job summary using vitest's own v8
coverage and davelosert/vitest-coverage-report-action, dropping the
codecov upload step (no external service required). Adds the
json-summary reporter the action needs and grants pull-requests: write.

The codecov badge is kept for now and will be revisited.

Author: rot1024

.github/workflows/ci.yml

@@ -6,6 +6,8 @@ on:
 
 permissions:
   contents: read
+  # Lets the coverage report action post/update a comment on pull requests.
+  pull-requests: write
 
 jobs:
   ci:
@@ -27,10 +29,11 @@ jobs:
         run: npm run lint
 
       - name: Test
-        run: npm test -- --coverage
+        run: npm test -- run --coverage
 
-      - name: codecov
-        uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6.0.0
+      - name: Report coverage
+        if: always()
+        uses: davelosert/vitest-coverage-report-action@02f3c2e641286b7fa308cd3e430783103ce6103b # v2.12.0
 
       - name: Build
         run: npm run build

README.md

@@ -1,6 +1,6 @@
 # quickjs-emscripten-sync
 
-[![CI](https://github.com/reearth/quickjs-emscripten-sync/actions/workflows/ci.yml/badge.svg)](https://github.com/reearth/quickjs-emscripten-sync/actions/workflows/main.yml) [![codecov](https://codecov.io/gh/reearth/quickjs-emscripten-sync/branch/main/graph/badge.svg)](https://codecov.io/gh/reearth/quickjs-emscripten-sync)
+[![CI](https://github.com/reearth/quickjs-emscripten-sync/actions/workflows/ci.yml/badge.svg)](https://github.com/reearth/quickjs-emscripten-sync/actions/workflows/ci.yml) [![codecov](https://codecov.io/gh/reearth/quickjs-emscripten-sync/branch/main/graph/badge.svg)](https://codecov.io/gh/reearth/quickjs-emscripten-sync)
 
 **Build a secure plugin system for web browsers.**
 

vite.config.ts

@@ -30,7 +30,9 @@ export default defineConfig({
     testTimeout: 30000,
     coverage: {
       provider: "v8",
-      reporter: ["text", "json"],
+      // json-summary is required by the GitHub Actions coverage report;
+      // json adds the per-file detail it links to.
+      reporter: ["text", "json", "json-summary"],
     },
   },
 });