Add `util.inspect.custom` support to `util.inspect/Bun.inspect/console.log` (#4194)

* start work on util.inspect.custom

* asdf

* finish util inspect custom inspect

* inspect

* fix tests

* revert

* tidy

* revert

* oops

* test

* fix issues

1 files changed, 40 insertions, 0 deletions

diff --git a/src/bun.js/bindings/bindings.cpp b/src/bun.js/bindings/bindings.cpp
index e1d6ba526..5e5f43c99 100644
--- a/src/bun.js/bindings/bindings.cpp
+++ b/src/bun.js/bindings/bindings.cpp
@@ -3957,6 +3957,7 @@ enum class BuiltinNamesMap : uint8_t {
     data,
     toString,
     redirect,
+    inspectCustom,
 };
 
 static JSC::Identifier builtinNameMap(JSC::JSGlobalObject* globalObject, unsigned char name)
@@ -3988,7 +3989,46 @@ static JSC::Identifier builtinNameMap(JSC::JSGlobalObject* globalObject, unsigne
     case BuiltinNamesMap::redirect: {
         return clientData->builtinNames().redirectPublicName();
     }
+    case BuiltinNamesMap::inspectCustom: {
+        return Identifier::fromUid(vm.symbolRegistry().symbolForKey("nodejs.util.inspect.custom"_s));
     }
+    }
+}
+
+extern "C" EncodedJSValue JSC__JSValue__callCustomInspectFunction(
+    JSC::JSGlobalObject* lexicalGlobalObject,
+    JSC__JSValue encodedFunctionValue,
+    JSC__JSValue encodedThisValue,
+    unsigned depth,
+    unsigned max_depth,
+    bool colors)
+{
+    auto* globalObject = jsCast<Zig::GlobalObject*>(lexicalGlobalObject);
+    JSValue functionToCall = JSValue::decode(encodedFunctionValue);
+    JSValue thisValue = JSValue::decode(encodedThisValue);
+    JSC::VM& vm = globalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+
+    JSFunction* inspectFn = globalObject->utilInspectFunction();
+    JSFunction* stylizeFn = colors ? globalObject->utilInspectStylizeColorFunction() : globalObject->utilInspectStylizeNoColorFunction();
+
+    JSObject* options = JSC::constructEmptyObject(globalObject);
+    options->putDirect(vm, Identifier::fromString(vm, "stylize"_s), stylizeFn);
+    options->putDirect(vm, Identifier::fromString(vm, "depth"_s), jsNumber(max_depth));
+    options->putDirect(vm, Identifier::fromString(vm, "colors"_s), jsBoolean(colors));
+
+    auto callData = JSC::getCallData(functionToCall);
+    MarkedArgumentBuffer arguments;
+    arguments.append(jsNumber(depth));
+    arguments.append(options);
+    arguments.append(inspectFn);
+
+    auto inspectRet = JSC::call(globalObject, functionToCall, callData, thisValue, arguments);
+    if (auto exe = scope.exception()) {
+        scope.clearException();
+        return JSValue::encode(exe);
+    }
+    RELEASE_AND_RETURN(scope, JSValue::encode(inspectRet));
 }
 
 JSC__JSValue JSC__JSValue__fastGetDirect_(JSC__JSValue JSValue0, JSC__JSGlobalObject* globalObject, unsigned char arg2)