add throw-type-error-before-custom-proto-access.js

Author: DevSDK

test/built-ins/TypedArrayConstructors/ctors/typedarray-arg/throw-type-error-before-custom-proto-access.js

@@ -0,0 +1,49 @@
+// Copyright (C) 2025 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-typedarray
+description: >
+  The newTarget getter must not be evaluated if argument processing throws an error before AllocateTypedArray is reached
+info: |
+  23.2.5.1 TypedArray ( ...args )
+    ...
+    5. If numberOfArgs = 0, then
+      a. Return ? AllocateTypedArray(constructorName, NewTarget, proto, 0).
+    6. Else,
+      a. Let firstArgument be args[0].
+      b. If firstArgument is an Object, then
+        ...
+      c. Else,
+        i. Assert: firstArgument is not an Object.
+        ii. Let elementLength be ? ToIndex(firstArgument).
+        iii. Return ? AllocateTypedArray(constructorName, NewTarget, proto, elementLength).
+
+  7.1.22 ToIndex ( value )
+    1. Let integer be ? ToIntegerOrInfinity(value).
+    ...
+
+  7.1.5 ToIntegerOrInfinity ( argument )
+    1. Let number be ? ToNumber(argument).
+    ...
+
+  7.1.4 ToNumber ( argument )
+    1. If argument is a Number, return argument.
+    2. If argument is either a Symbol or a BigInt, throw a TypeError exception.
+    ...
+
+includes: [testTypedArray.js]
+features: [Reflect, TypedArray]
+---*/
+
+var newTarget = function () {}.bind(null);
+Object.defineProperty(newTarget, "prototype", {
+  get() {
+    throw new Test262Error();
+  },
+});
+
+testWithTypedArrayConstructors(function (TA) {
+  assert.throws(TypeError, function () {
+    Reflect.construct(TA, [Symbol()], newTarget);
+  });
+});