1 files changed, 4 insertions, 0 deletions
diff --git a/js/loader/ModuleLoadRequest.cpp b/js/loader/ModuleLoadRequest.cpp
index 7e188160fc..7313563df9 100644
--- a/js/loader/ModuleLoadRequest.cpp
+++ b/js/loader/ModuleLoadRequest.cpp
@@ -205,6 +205,7 @@ void ModuleLoadRequest::CheckModuleDependenciesLoaded() {
   if (!mModuleScript || mModuleScript->HasParseError()) {
     return;
   }
+
   for (const auto& childRequest : mImports) {
     ModuleScript* childScript = childRequest->mModuleScript;
     if (!childScript) {
@@ -213,6 +214,9 @@ void ModuleLoadRequest::CheckModuleDependenciesLoaded() {
            childRequest.get()));
       return;
     }
+
+    MOZ_DIAGNOSTIC_ASSERT(mModuleScript->HadImportMap() ==
+                          childScript->HadImportMap());
   }
 
   LOG(("ScriptLoadRequest (%p):   all ok", this));