chore: add codecov integration

Author: bartveneman

.github/workflows/test.yml

@@ -25,6 +25,10 @@ jobs:
       - name: Install Playwright Browsers
         run: npx playwright install chromium --only-shell
       - run: npm test -- --forbid-only
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   check-ts:
     name: Check types

src/cli/program.ts

@@ -59,9 +59,6 @@ export function program(
 	},
 	coverage_data: Coverage[],
 ) {
-	if (coverage_data.length === 0) {
-		throw new MissingDataError()
-	}
 	let coverage = calculate_coverage(coverage_data)
 	let min_line_coverage_result = validate_min_line_coverage(coverage.line_coverage_ratio, min_file_coverage)
 	let min_file_line_coverage_result = validate_min_file_line_coverage(