2 files changed, 16 insertions, 0 deletions
diff --git a/cli/rt/02_console.js b/cli/rt/02_console.js
index 0b5931616..ab91ffc09 100644
--- a/cli/rt/02_console.js
+++ b/cli/rt/02_console.js
@@ -193,6 +193,11 @@
   }
 
   function inspectFunction(value, _ctx) {
+    if (customInspect in value && typeof value[customInspect] === "function") {
+      try {
+        return String(value[customInspect]());
+      } catch {}
+    }
     // Might be Function/AsyncFunction/GeneratorFunction
     const cstrName = Object.getPrototypeOf(value).constructor.name;
     if (value.name && value.name !== "anonymous") {
diff --git a/cli/tests/unit/console_test.ts b/cli/tests/unit/console_test.ts
index 38bb852f0..eb2c51aef 100644
--- a/cli/tests/unit/console_test.ts
+++ b/cli/tests/unit/console_test.ts
@@ -831,6 +831,17 @@ unitTest(function consoleTestWithCustomInspectorError(): void {
   );
 });
 
+unitTest(function consoleTestWithCustomInspectFunction(): void {
+  function a() {}
+  Object.assign(a, {
+    [customInspect]() {
+      return "b";
+    },
+  });
+
+  assertEquals(stringify(a), "b");
+});
+
 unitTest(function consoleTestWithIntegerFormatSpecifier(): void {
   assertEquals(stringify("%i"), "%i");
   assertEquals(stringify("%i", 42.0), "42");