node:timers fixes (#16855)

src/codegen/class-definitions.ts

@@ -9,6 +9,22 @@ interface PropertyAttribute {
   privateSymbol?: string;
 }
 
+/**
+ * Specifies what happens when a method is called with `this` set to a value that is not an instance
+ * of the class.
+ */
+export enum InvalidThisBehavior {
+  /**
+   * Default. Throws a `TypeError`.
+   */
+  Throw,
+  /**
+   * Do not call the native implementation; return `undefined`. Some Node.js methods are supposed to
+   * work like this.
+   */
+  NoOp,
+}
+
 export type Field =
   | ({
       getter: string;
@@ -35,6 +51,7 @@ export type Field =
        */
       length?: number;
       passThis?: boolean;
+      invalidThisBehavior?: InvalidThisBehavior;
       DOMJIT?: {
         returns: string;
         args?: [string, string] | [string, string, string] | [string] | [];

src/codegen/generate-classes.ts

@@ -1,6 +1,6 @@
 // @ts-nocheck
 import path from "path";
-import type { ClassDefinition, Field } from "./class-definitions";
+import { InvalidThisBehavior, type ClassDefinition, type Field } from "./class-definitions";
 import { camelCase, pascalCase, writeIfNotChanged } from "./helpers";
 import jsclasses from "./../bun.js/bindings/js_classes";
 
@@ -1163,6 +1163,7 @@ JSC_DEFINE_CUSTOM_SETTER(${symbolName(typeName, name)}SetterWrap, (JSGlobalObjec
 
     if ("fn" in proto[name]) {
       const fn = proto[name].fn;
+      const invalidThisBehavior = proto[name].invalidThisBehavior ?? InvalidThisBehavior.Throw;
       rows.push(`
 JSC_DEFINE_HOST_FUNCTION(${symbolName(typeName, name)}Callback, (JSGlobalObject * lexicalGlobalObject, CallFrame* callFrame))
 {
@@ -1172,8 +1173,13 @@ JSC_DEFINE_HOST_FUNCTION(${symbolName(typeName, name)}Callback, (JSGlobalObject
   ${className(typeName)}* thisObject = jsDynamicCast<${className(typeName)}*>(callFrame->thisValue());
 
   if (UNLIKELY(!thisObject)) {
-      scope.throwException(lexicalGlobalObject, Bun::createInvalidThisError(lexicalGlobalObject, callFrame->thisValue(), "${typeName}"_s));
-      return {};
+      ${
+        invalidThisBehavior == InvalidThisBehavior.Throw
+          ? `
+    scope.throwException(lexicalGlobalObject, Bun::createInvalidThisError(lexicalGlobalObject, callFrame->thisValue(), "${typeName}"_s));
+    return {};`
+          : `return JSValue::encode(JSC::jsUndefined());`
+      }
   }
 
   JSC::EnsureStillAliveScope thisArg = JSC::EnsureStillAliveScope(thisObject);