nodejs
diff --git a/‎lib/repl.js‎
Lines changed: 13 additions & 4 deletions b/‎lib/repl.js‎
Lines changed: 13 additions & 4 deletions
@@ -119,6 +119,9 @@ const { setImmediate } = require('timers');
 // Lazy-loaded.
 let processTopLevelAwait;
 
+const globalBuiltins =
+  new Set(vm.runInNewContext('Object.getOwnPropertyNames(globalThis)'));
+
 const parentModule = module;
 const replMap = new WeakMap();
 const domainSet = new WeakSet();
@@ -907,8 +910,8 @@ REPLServer.prototype.createContext = function() {
       context = vm.createContext();
     });
     for (const name of ObjectGetOwnPropertyNames(global)) {
-      // Only set properties on the context that do not exist as primordial.
-      if (!(name in primordials)) {
+      // Only set properties that do not already exist as a global builtin.
+      if (!globalBuiltins.has(name)) {
         ObjectDefineProperty(context, name,
                              ObjectGetOwnPropertyDescriptor(global, name));
       }
@@ -1257,8 +1260,14 @@ function complete(line, callback) {
             completionGroups.push(
               filteredOwnPropertyNames.call(this, contextProto));
           }
-          completionGroups.push(
-            filteredOwnPropertyNames.call(this, this.context));
+          const contextOwnNames =
+            filteredOwnPropertyNames.call(this, this.context);
+          if (!this.useGlobal) {
+            // When the context is not `global`, builtins are not own
+            // properties of it.
+            contextOwnNames.push(...globalBuiltins);
+          }
+          completionGroups.push(contextOwnNames);
           if (filter !== '') addCommonWords(completionGroups);
           completionGroupsLoaded();
         } else {