fix(console): fix inspection of Function (#7930)

This commit fixes the inspection of functions. The current 
implementation gets the name of the type of the function 
from "f.__proto__.constructor.name", and it throws when 
the prototype is set to null. 

This commit checks the prototype before accessing its 
constructor name and uses the generic name 'Function' 
if the prototype is not available.

2 files changed, 22 insertions, 2 deletions

diff --git a/cli/rt/02_console.js b/cli/rt/02_console.js
index 363a95d90..0eb7f0aac 100644
--- a/cli/rt/02_console.js
+++ b/cli/rt/02_console.js
@@ -196,8 +196,13 @@
         return String(value[customInspect]());
       } catch {}
     }
-    // Might be Function/AsyncFunction/GeneratorFunction
-    const cstrName = Object.getPrototypeOf(value).constructor.name;
+    // Might be Function/AsyncFunction/GeneratorFunction/AsyncGeneratorFunction
+    let cstrName = Object.getPrototypeOf(value)?.constructor?.name;
+    if (!cstrName) {
+      // If prototype is removed or broken,
+      // use generic 'Function' instead.
+      cstrName = "Function";
+    }
     if (value.name && value.name !== "anonymous") {
       // from MDN spec
       return `[${cstrName}: ${value.name}]`;
diff --git a/cli/tests/unit/console_test.ts b/cli/tests/unit/console_test.ts
index df1420345..00a5927b1 100644
--- a/cli/tests/unit/console_test.ts
+++ b/cli/tests/unit/console_test.ts
@@ -347,6 +347,21 @@ unitTest(function consoleTestStringifyCircular(): void {
 });
 /* eslint-enable @typescript-eslint/explicit-function-return-type */
 
+unitTest(function consoleTestStringifyFunctionWithPrototypeRemoved(): void {
+  const f = function f() {};
+  Reflect.setPrototypeOf(f, null);
+  assertEquals(stringify(f), "[Function: f]");
+  const af = async function af() {};
+  Reflect.setPrototypeOf(af, null);
+  assertEquals(stringify(af), "[Function: af]");
+  const gf = function gf() {};
+  Reflect.setPrototypeOf(gf, null);
+  assertEquals(stringify(gf), "[Function: gf]");
+  const agf = function agf() {};
+  Reflect.setPrototypeOf(agf, null);
+  assertEquals(stringify(agf), "[Function: agf]");
+});
+
 unitTest(function consoleTestStringifyWithDepth(): void {
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   const nestedObj: any = { a: { b: { c: { d: { e: { f: 42 } } } } } };