feat: add coverage enforcement for tests and update CI configuration

Author: devlux76

.github/workflows/ci.yml

@@ -26,8 +26,8 @@ jobs:
       - name: Typecheck
         run: bun run build
 
-      - name: Test
-        run: bun run test:unit
+      - name: Test (coverage enforcement)
+        run: bun run test:coverage
 
       - name: Guard — model-derived numerics
         run: bun run guard:model-derived

bun.lock

@@ -9,6 +9,7 @@
     "lint": "eslint .",
     "test": "bun run lint && bun run build && vitest run tests/*.test.ts tests/**/*.test.ts",
     "test:unit": "vitest run tests/*.test.ts tests/**/*.test.ts",
+    "test:coverage": "vitest run --coverage",
     "test:watch": "vitest tests/*.test.ts tests/**/*.test.ts",
     "dev:harness": "bun scripts/runtime-harness-server.mjs",
     "test:browser": "playwright test",
@@ -33,6 +34,7 @@
   "devDependencies": {
     "@eslint/js": "latest",
     "@playwright/test": "latest",
+    "@vitest/coverage-v8": "^4.1.0",
     "@webgpu/types": "latest",
     "electron": "latest",
     "eslint": "latest",

package.json

@@ -0,0 +1,43 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    include: ["**/*.test.ts", "**/*.spec.ts"],
+    coverage: {
+      provider: "v8",
+      enabled: true,
+      clean: true,
+      include: ["lib/**/*.ts"],
+      all: true,
+      reporter: ["text", "html"],
+      reportsDirectory: "coverage",
+      exclude: [
+        // Runtime configuration + platform-specific code that is not testable in this environment
+        "lib/CreateVectorBackend.ts",
+        "lib/WasmVectorBackend.ts",
+        "lib/WebGLVectorBackend.ts",
+        "lib/WebGPUVectorBackend.ts",
+        "lib/WebNNVectorBackend.ts",
+        // Pure type definitions (no executable JS generated)
+        "**/*.d.ts",
+        "**/types.ts",
+        "**/VectorBackend.ts",
+        "**/ModelProfile.ts",
+        "**/QueryResult.ts",
+        "**/WebNNTypes.*",
+        // Test and tooling files
+        "tests/**",
+        "benchmarks/**",
+        "scripts/**",
+        "docker/**",
+        "node_modules/**",
+      ],
+      thresholds: {
+        lines: 90,
+        functions: 90,
+        branches: 90,
+        statements: 90,
+      },
+    },
+  },
+});