Enhancement: Generate test coverage reports after npm test (#2289)

Author: chen ruixiang

.c8rc.json

@@ -0,0 +1,22 @@
+{
+    "reporter": [
+        "html",
+        "text"
+    ],
+    "reportsDirectory": "./coverage",
+    "src": [
+        "src"
+    ],
+    "exclude": [
+        "std/**/*",
+        "tests/**/*",
+        "dist/**/*",
+        "bin/asinit.js",
+        "lib/**/*",
+        "scripts/**/*",
+        "src/glue/wasm/**/*",
+        "util/browser/**/*"
+    ],
+    "clean": true,
+    "exclude-after-remap": true
+}

.gitignore

@@ -9,3 +9,4 @@ raw/
 .idea
 cli/index.generated.js
 src/diagnosticMessages.generated.ts
+coverage/

package.json

@@ -31,7 +31,8 @@
     "esbuild": "^0.14.1",
     "eslint": "^8.2.0",
     "glob": "^7.2.0",
-    "typescript": "~4.5.2"
+    "typescript": "~4.5.2",
+    "c8": "^7.11.2"
   },
   "type": "module",
   "exports": {
@@ -65,7 +66,8 @@
     "lint": "eslint --max-warnings 0 --ext js . && eslint --max-warnings 0 --ext ts .",
     "build": "node scripts/build",
     "watch": "node scripts/build --watch",
-    "test": "npm run test:parser && npm run test:compiler -- --parallel && npm run test:browser && npm run test:asconfig && npm run test:transform",
+    "coverage":"ASC_FEATURES=\"*\" c8 npm run test",
+    "test": "npm run test:parser && npm run test:compiler && npm run test:browser && npm run test:asconfig && npm run test:transform",
     "test:parser": "node --enable-source-maps tests/parser",
     "test:compiler": "node --enable-source-maps --experimental-wasi-unstable-preview1 --no-warnings tests/compiler",
     "test:browser": "node --enable-source-maps tests/browser",