diff --git a/src-runtime/validateType.js b/src-runtime/validateType.js
index 5b68d4a..17d1a66 100644
--- a/src-runtime/validateType.js
+++ b/src-runtime/validateType.js
@@ -12,6 +12,7 @@ import {validateObject      } from "./validateObject.js";
 import {validateRecord      } from "./validateRecord.js";
 import {validateSet         } from "./validateSet.js";
 import {validateTuple       } from "./validateTuple.js";
+import {validateTypeof      } from "./validateTypeof.js";
 import {validateTypedef     } from "./validateTypedef.js";
 import {validateUnion       } from "./validateUnion.js";
 /**
@@ -125,6 +126,8 @@ function validateType(value, expect, loc, name, critical = true, warn, depth) {
     case 'tuple':
       // Trigger: pc.app.scene.setSkybox([1, 2, 3]);
       return validateTuple(value, expect, loc, name, critical, warn, depth + 1);
+    case 'typeof':
+      return validateTypeof(value, expect, loc, name, critical, warn, depth + 1);
     case '*':
     case 'any':
       return true;
diff --git a/src-runtime/validateTypeof.js b/src-runtime/validateTypeof.js
new file mode 100644
index 0000000..6d20a95
--- /dev/null
+++ b/src-runtime/validateTypeof.js
@@ -0,0 +1,15 @@
+import {classes} from "./registerClass.js";
+/**
+ * @param {*} value - The actual value that we need to validate.
+ * @param {*} expect - The supposed type information of said value.
+ * @param {string} loc - String like `BoundingBox#compute`
+ * @param {string} name - Name of the argument
+ * @param {boolean} critical - Only `false` for unions.
+ * @param {console["warn"]} warn - Function to warn with.
+ * @param {number} depth - The depth to detect recursion.
+ * @returns {boolean} Boolean indicating if a type is correct.
+ */
+export function validateTypeof(value, expect, loc, name, critical, warn, depth) {
+  // console.log("validateTypeof", {value, expect, loc, name, critical, warn, depth});
+  return value === classes[expect.argument];
+}
diff --git a/test-with-conversion.js b/test-with-conversion.js
new file mode 100644
index 0000000..5c18a29
--- /dev/null
+++ b/test-with-conversion.js
@@ -0,0 +1,10 @@
+import {readFileSync, writeFileSync} from 'fs';
+import {addTypeChecks} from "./src-transpiler/addTypeChecks.js";
+const files = [
+  "test-typeof.js",
+];
+for (const file of files) {
+  const content = readFileSync('./test/convert-first/' + file, 'utf-8');
+  const contentWithTypeChecks = addTypeChecks(content);
+  writeFileSync('./test/converted/' + file, contentWithTypeChecks);
+}
diff --git a/test/convert-first/test-typeof.js b/test/convert-first/test-typeof.js
new file mode 100644
index 0000000..dd1398d
--- /dev/null
+++ b/test/convert-first/test-typeof.js
@@ -0,0 +1,25 @@
+import {options} from '@runtime-type-inspector/runtime';
+class TestClass1 {
+  abc = 123;
+  constructor(greeting = "hi1") {
+    this.greeting = greeting;
+  }
+}
+class TestClass2 {
+  abc = 123;
+  constructor(greeting = "hi2") {
+    this.greeting = greeting;
+  }
+}
+/**
+ * @param {typeof TestClass1} someClass - Some class.
+ * @param {...any} args - The arguments.
+ * @returns {object} The object.
+ */
+function callNew(someClass, ...args) {
+  return new someClass(...args);
+}
+const testClass1 = callNew(TestClass1, "hoi1");
+console.assert(options.count === 0, "Should have 0 errors here");
+const testClass2 = callNew(TestClass2, "hoi2");
+console.assert(options.count === 1, "Should have 1 error here");
diff --git a/test/converted/test-typeof.mjs b/test/converted/test-typeof.mjs
new file mode 100644
index 0000000..205a388
--- /dev/null
+++ b/test/converted/test-typeof.mjs
@@ -0,0 +1,45 @@
+import {inspectType, inspectTypeWithTemplates, youCanAddABreakpointHere, registerVariable, validateDivision, registerTypedef, registerClass, registerImportNamespaceSpecifier} from '@runtime-type-inspector/runtime';
+export * from '@runtime-type-inspector/runtime';
+import {options} from '@runtime-type-inspector/runtime';
+class TestClass1 {
+  abc = 123;
+  constructor(greeting = "hi1") {
+    this.greeting = greeting;
+  }
+}
+registerClass(TestClass1);
+class TestClass2 {
+  abc = 123;
+  constructor(greeting = "hi2") {
+    this.greeting = greeting;
+  }
+}
+registerClass(TestClass2);
+
+/**
+ * @param {typeof TestClass1} someClass - Some class.
+ * @param {...any} args - The arguments.
+ * @returns {object} The object.
+ */
+
+function callNew(someClass, ...args) {
+  if (!inspectType(someClass, {
+    "type": "typeof",
+    "argument": "TestClass1",
+    "optional": false
+  }, 'callNew', 'someClass')) {
+    youCanAddABreakpointHere();
+  }
+  if (!inspectType(args, {
+    "type": "array",
+    "elementType": "any",
+    "optional": false
+  }, 'callNew', 'args')) {
+    youCanAddABreakpointHere();
+  }
+  return new someClass(...args);
+}
+const testClass1 = callNew(TestClass1, "hoi1");
+console.assert(options.count === 0, "Should have 0 errors here");
+const testClass2 = callNew(TestClass2, "hoi2");
+console.assert(options.count === 1, "Should have 1 error here");