Fix --expose-gc flag inheritance for --test in node 24+

Author: aomarks

package.json

@@ -203,7 +203,7 @@
       "output": []
     },
     "test:codeactions": {
-      "command": "node --test --test-reporter=spec lib/test/codeactions.test.js",
+      "command": "node --test --test-reporter=dot lib/test/codeactions.test.js",
       "env": {
         "NODE_OPTIONS": "--enable-source-maps"
       },
@@ -236,7 +236,7 @@
       "output": []
     },
     "test:diagnostic": {
-      "command": "node --test --test-reporter=spec lib/test/diagnostic.test.js",
+      "command": "node --test --test-reporter=dot lib/test/diagnostic.test.js",
       "env": {
         "NODE_OPTIONS": "--enable-source-maps"
       },
@@ -291,7 +291,7 @@
       "output": []
     },
     "test:gc": {
-      "command": "node --test --test-reporter=spec --expose-gc lib/test/gc.test.js",
+      "command": "node --test --test-reporter=dot lib/test/gc.test.js",
       "env": {
         "NODE_OPTIONS": "--enable-source-maps"
       },

src/test/gc.test.ts

@@ -17,16 +17,19 @@ import {SimpleLogger} from '../logging/simple-logger.js';
 import {WorkerPool} from '../util/worker-pool.js';
 import {registerExecutionConstructorHook} from '../execution/base.js';
 import {Console} from '../logging/logger.js';
+import v8 from 'node:v8';
+import vm from 'node:vm';
 
 let numLiveExecutors = 0;
 let numLiveExecutions = 0;
 
-const collectGarbage = (() => {
-  if (global.gc == null) {
-    throw new Error('gc.test must be invoked with --expose-gc');
+const collectGarbage = () => {
+  if (!global.gc) {
+    v8.setFlagsFromString('--expose_gc');
+    global.gc = vm.runInNewContext('gc');
   }
-  return global.gc;
-})();
+  global.gc!();
+};
 
 beforeEach(() => {
   const executorFinalizationRegistry = new FinalizationRegistry(() => {