code: Setup codecov GitHub Action integration

Author: edg2s

.github/workflows/nodejs.yml

@@ -22,5 +22,14 @@ jobs:
         npm ci
         npm run build --if-present
         npm test
+        npm run report
       env:
         CI: true
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v1
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        file: ./coverage.lcov
+        flgas: unittests
+        name: codecov-umbrella
+        fail_ci_if_error: true

codecov.yaml

@@ -0,0 +1,3 @@
+comment:
+  layout: "diff, files"
+

package-lock.json

@@ -16,6 +16,7 @@
 	"scripts": {
 		"pretest": "eslint --report-unused-disable-directives .",
 		"test": "nyc mocha --reporter dot tests/** && git diff --exit-code docs/ src/ README.md",
+		"report": "nyc report --reporter=text-lcov > coverage.lcov",
 		"testpath": "mocha",
 		"doc": "rm -f docs/* && mocha --reporter dot tests/** --doc && node tools/build-readme.js",
 		"build": "npm run doc && node tools/build-all-methods.js"
@@ -27,6 +28,7 @@
 		"eslint": ">=2.3.0"
 	},
 	"devDependencies": {
+		"codecov": "^3.6.5",
 		"eslint": "^6.4.0",
 		"eslint-config-wikimedia": "^0.15.1",
 		"eslint-plugin-rulesdir": "^0.1.0",