fix: Coverage flag with npm command line parameter

Author: chen ruixiang

package.json

@@ -71,9 +71,9 @@
     "lint": "eslint --max-warnings 0 --ext js . && eslint --max-warnings 0 --ext ts .",
     "build": "node scripts/build",
     "watch": "node scripts/build --watch",
-    "coverage": "ASC_FEATURES=\"*\" c8 npm run test:coverage",
+    "coverage": "c8 npm run test:coverage",
     "test": "npm run test:parser && npm run test:compiler -- --parallel && npm run test:browser && npm run test:asconfig && npm run test:transform",
-    "test:coverage": "npm run test:parser && npm run test:compiler && npm run test:browser && npm run test:asconfig && npm run test:transform",
+    "test:coverage": "npm run test:parser && npm run test:compiler -- --coverage && 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",

tests/compiler.js

@@ -58,6 +58,9 @@ const config = {
     "description": "Prints this message and exits.",
     "type": "b",
     "alias": "h"
+  },
+  "coverage": {
+    "description": "Enable this option during generating test coverage report"
   }
 };
 const opts = optionsUtil.parse(process.argv.slice(2), config);
@@ -78,7 +81,7 @@ if (args.help) {
   process.exit(0);
 }
 
-const features = process.env.ASC_FEATURES ? process.env.ASC_FEATURES.split(",") : [];
+const features = args.coverage ? ["*"] : process.env.ASC_FEATURES ? process.env.ASC_FEATURES.split(",") : [];
 const featuresConfig = require("./features.json");
 const basedir = path.join(dirname, "compiler");
 
@@ -501,7 +504,7 @@ function evaluateResult(failedTests, skippedTests) {
 }
 
 // Run tests in parallel if requested
-if (args.parallel && coreCount > 2) {
+if (args.parallel && coreCount > 2 && !args.coverage) {
   if (cluster.isWorker) {
     process.on("message", msg => {
       if (msg.cmd != "run") throw Error("invalid command: " + JSON.stringify(msg));