[Fix] ES2015+: ValidateTypedArray: proper detachment check and return value

Author: ljharb

.gitattributes

@@ -1124,7 +1124,6 @@
 /2022/UTF16EncodeCodePoint.js	spackled linguist-generated=true
 /2022/UTF16SurrogatePairToCodePoint.js	spackled linguist-generated=true
 /2022/UnicodeEscape.js	spackled linguist-generated=true
-/2022/ValidateTypedArray.js	spackled linguist-generated=true
 /2022/WeakRefDeref.js	spackled linguist-generated=true
 /2022/WeekDay.js	spackled linguist-generated=true
 /2022/WordCharacters.js	spackled linguist-generated=true

2015/ValidateTypedArray.js

@@ -4,27 +4,27 @@ var GetIntrinsic = require('get-intrinsic');
 
 var $TypeError = GetIntrinsic('%TypeError%');
 
-var callBound = require('call-bind/callBound');
-var $taSome = callBound('TypedArray.prototype.some', true);
-
+var IsDetachedBuffer = require('./IsDetachedBuffer');
 var Type = require('./Type');
 
 var isTypedArray = require('is-typed-array');
+var typedArrayBuffer = require('typed-array-buffer');
 
 // https://262.ecma-international.org/6.0/#sec-validatetypedarray
 
 module.exports = function ValidateTypedArray(O) {
 	if (Type(O) !== 'Object') {
-		throw new $TypeError('Assertion failed: O must be an Object');
+		throw new $TypeError('Assertion failed: `O` must be an Object'); // step 1
 	}
 	if (!isTypedArray(O)) {
-		throw new $TypeError('Assertion failed: O must be a TypedArray');
+		throw new $TypeError('Assertion failed: `O` must be a Typed Array'); // steps 2 - 3
 	}
 
-	// without `.some` (like in node 0.10), there's no way to check buffer detachment, but also no way to be detached
-	if ($taSome) {
-		$taSome(O, function () { return true; });
+	var buffer = typedArrayBuffer(O); // step 4
+
+	if (IsDetachedBuffer(buffer)) {
+		throw new $TypeError('`O` must be backed by a non-detached buffer'); // step 5
 	}
 
-	return O.buffer;
+	return buffer; // step 6
 };

2016/ValidateTypedArray.js

@@ -4,27 +4,25 @@ var GetIntrinsic = require('get-intrinsic');
 
 var $TypeError = GetIntrinsic('%TypeError%');
 
-var callBound = require('call-bind/callBound');
-var $taSome = callBound('TypedArray.prototype.some', true);
-
+var IsDetachedBuffer = require('./IsDetachedBuffer');
 var Type = require('./Type');
 
 var isTypedArray = require('is-typed-array');
+var typedArrayBuffer = require('typed-array-buffer');
 
-// https://262.ecma-international.org/6.0/#sec-validatetypedarray
+// https://262.ecma-international.org/13.0/#sec-validatetypedarray
 
 module.exports = function ValidateTypedArray(O) {
 	if (Type(O) !== 'Object') {
-		throw new $TypeError('Assertion failed: O must be an Object');
+		throw new $TypeError('Assertion failed: `O` must be an Object'); // step 1
 	}
 	if (!isTypedArray(O)) {
-		throw new $TypeError('Assertion failed: O must be a TypedArray');
+		throw new $TypeError('Assertion failed: `O` must be a Typed Array'); // steps 1 - 2
 	}
 
-	// without `.some` (like in node 0.10), there's no way to check buffer detachment, but also no way to be detached
-	if ($taSome) {
-		$taSome(O, function () { return true; });
-	}
+	var buffer = typedArrayBuffer(O); // step 3
 
-	return O.buffer;
+	if (IsDetachedBuffer(buffer)) {
+		throw new $TypeError('`O` must be backed by a non-detached buffer'); // step 4
+	}
 };

2017/ValidateTypedArray.js

@@ -5526,6 +5526,18 @@ var es2015 = function ES2015(ES, ops, expectedMissing, skips) {
 					function () { ES.ValidateTypedArray(ta); },
 					debug(ta) + ' is a TypedArray'
 				);
+
+				st.test('can detach', { skip: !canDetach }, function (s2t) {
+					ES.DetachArrayBuffer(ta.buffer);
+
+					s2t['throws'](
+						function () { ES.ValidateTypedArray(ta); },
+						TypeError,
+						debug(ta) + ' is a detached TypedArray'
+					);
+
+					s2t.end();
+				});
 			});
 
 			st.end();