esm: show race error message for inner module job race

joyeecheung · richardlau · commit 9e1fbb620f2d · 2025-09-20T04:32:37.000Z
The race can not only happen when the ESM is loaded by the CommonJS loader, but can also happen to inner module jobs in the dependency graph. PR-URL: #59519 Fixes: #59366 Refs: https://github.com/abejfehr/node-22.18-issue-repro Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com> Reviewed-By: Filip Skokan <panva.ip@gmail.com> Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
diff --git a/lib/internal/modules/esm/loader.js b/lib/internal/modules/esm/loader.js
@@ -462,6 +462,10 @@ class ModuleLoader {
     const resolvedImportAttributes = resolveResult.importAttributes ?? importAttributes;
     let job = this.loadCache.get(url, resolvedImportAttributes.type);
     if (job !== undefined) {
+      // TODO(node:55782): this race may stop happening when the ESM resolution and loading become synchronous.
+      if (!job.module) {
+        assert.fail(getRaceMessage(url, parentURL));
+      }
       // This module is being evaluated, which means it's imported in a previous link
       // in a cycle.
       if (job.module.getStatus() === kEvaluating) {
