ci: add test coverage configuration and CI workflow

Author: dazzatronus

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  verify:
+    name: Lint, Typecheck, Test & Build
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - run: npm ci
+
+      - run: npm run verify:ci
+
+      - name: Upload coverage report
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: coverage/
+          retention-days: 14

.gitignore

@@ -7,6 +7,9 @@ dist-ssr
 .vite/
 .env
 
+# Test coverage
+coverage/
+
 # IDE
 .vscode
 .idea

jest.config.js

@@ -31,5 +31,21 @@ export default {
 				tsconfig: "tsconfig.test.json"
 			}
 		]
+	},
+	collectCoverageFrom: [
+		"src/**/*.ts",
+		"!src/**/*.d.ts",
+		"!src/**/index.ts",
+		"!src/styles/**"
+	],
+	coverageDirectory: "coverage",
+	coverageReporters: ["text", "text-summary", "lcov"],
+	coverageThreshold: {
+		global: {
+			branches: 20,
+			functions: 25,
+			lines: 25,
+			statements: 25
+		}
 	}
 };

package.json

@@ -55,13 +55,14 @@
 		"build:main": "vite build",
 		"build:internal": "node scripts/build-internal.mjs",
 		"test": "jest",
+		"test:coverage": "jest --coverage",
 		"test:watch": "jest --watch",
 		"test:package": "node test-package.js",
 		"typecheck": "tsc --noEmit && tsc --project tsconfig.test.json --noEmit",
 		"lint": "eslint --ignore-path .gitignore .",
 		"lint:fix": "eslint --ignore-path .gitignore --fix .",
 		"format": "prettier --ignore-path .gitignore --write .",
-		"verify:ci": "npm run lint && npm run typecheck && npm run test && npm run build && npm run test:package",
+		"verify:ci": "npm run lint && npm run typecheck && npm run test:coverage && npm run build && npm run test:package",
 		"release:check": "npm run verify:ci && npm pack --dry-run --json",
 		"prepublishOnly": "npm run release:check",
 		"generate:fonts": "npx tsx scripts/fetch-google-fonts.ts"