From b55fcd75daa6592f1d236455f86481f0d3f01dfe Mon Sep 17 00:00:00 2001
From: Antoine du Hamel <duhamelantoine1995@gmail.com>
Date: Sat, 21 Oct 2023 11:25:11 +0200
Subject: [PATCH] test: deflake `test-esm-loader-resolve-type`
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PR-URL: https://github.com/nodejs/node/pull/50273
Fixes: https://github.com/nodejs/node/issues/50040
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
---
 .../hook-resolve-type-loader.mjs              | 19 +++++++----
 .../es-module-loaders/hook-resolve-type.mjs   | 32 ++++++-------------
 2 files changed, 23 insertions(+), 28 deletions(-)

diff --git a/test/fixtures/es-module-loaders/hook-resolve-type-loader.mjs b/test/fixtures/es-module-loaders/hook-resolve-type-loader.mjs
index f2dc0aba5ca80e..c410401876e448 100644
--- a/test/fixtures/es-module-loaders/hook-resolve-type-loader.mjs
+++ b/test/fixtures/es-module-loaders/hook-resolve-type-loader.mjs
@@ -1,7 +1,14 @@
-/** @type {MessagePort} */
-let port;
-export function initialize(data) {
-  port = data.port;
+/** @type {Uint8Array} */
+let data;
+/** @type {number} */
+let ESM_MODULE_INDEX;
+/** @type {number} */
+let CJS_MODULE_INDEX;
+
+export function initialize({ sab, ESM_MODULE_INDEX:e, CJS_MODULE_INDEX:c }) {
+  data = new Uint8Array(sab);
+  ESM_MODULE_INDEX = e;
+  CJS_MODULE_INDEX = c;
 }
 
 export async function resolve(specifier, context, next) {
@@ -9,9 +16,9 @@ export async function resolve(specifier, context, next) {
   const { format } = nextResult;
 
   if (format === 'module' || specifier.endsWith('.mjs')) {
-    port.postMessage({ type: 'module' });
+    Atomics.add(data, ESM_MODULE_INDEX, 1);
   } else if (format == null || format === 'commonjs') {
-    port.postMessage({ type: 'commonjs' });
+    Atomics.add(data, CJS_MODULE_INDEX, 1);
   }
 
   return nextResult;
diff --git a/test/fixtures/es-module-loaders/hook-resolve-type.mjs b/test/fixtures/es-module-loaders/hook-resolve-type.mjs
index 6fa7a553b8e83f..7324a08e84b6c0 100644
--- a/test/fixtures/es-module-loaders/hook-resolve-type.mjs
+++ b/test/fixtures/es-module-loaders/hook-resolve-type.mjs
@@ -1,30 +1,18 @@
 import * as fixtures from '../../common/fixtures.mjs';
 import { register } from 'node:module';
-import { MessageChannel } from 'node:worker_threads';
 
-let importedESM = 0;
-let importedCJS = 0;
+const sab = new SharedArrayBuffer(2);
+const data = new Uint8Array(sab);
+
+const ESM_MODULE_INDEX = 0
+const CJS_MODULE_INDEX = 1
+
 export function getModuleTypeStats() {
+  const importedESM = Atomics.load(data, ESM_MODULE_INDEX);
+  const importedCJS = Atomics.load(data, CJS_MODULE_INDEX);
   return { importedESM, importedCJS };
-};
-
-const { port1, port2 } = new MessageChannel();
+}
 
 register(fixtures.fileURL('es-module-loaders/hook-resolve-type-loader.mjs'), {
-  data: { port: port2 },
-  transferList: [port2],
+  data: { sab, ESM_MODULE_INDEX, CJS_MODULE_INDEX },
 });
-
-port1.on('message', ({ type }) => {
-  switch (type) {
-    case 'module':
-      importedESM++;
-      break;
-    case 'commonjs':
-      importedCJS++;
-      break;
-  }
-});
-
-port1.unref();
-port2.unref();