throw proper errors on an incorrect context in some ArrayBuffer and DataView methods

Author: zloirock

CHANGELOG.md

@@ -38,6 +38,8 @@
 - Improved some cases handling of array-replacer in `JSON.stringify` symbols handling fix
 - Fixed many other old `JSON.{ parse, stringify }` bugs (numbers instead of strings as keys in replacer, handling negative zeroes, spaces, some more handling symbols cases, etc.)
 - Fixed configurability and `ToString` conversion of some accessors
+- Added throwing proper errors on an incorrect context in some `ArrayBuffer` and `DataView` methods
+- Some minor `DataView` polyfill optimizations
 - `RegExp.prototype.flags` marked as fixed from V8 ~ Chrome 111
 - Added Opera Android 73 compat data mapping
 - Added TypeScript definitions to `core-js-builder`

packages/core-js/internals/array-buffer.js

@@ -23,13 +23,14 @@ var InternalStateModule = require('../internals/internal-state');
 
 var PROPER_FUNCTION_NAME = FunctionName.PROPER;
 var CONFIGURABLE_FUNCTION_NAME = FunctionName.CONFIGURABLE;
-var getInternalState = InternalStateModule.get;
-var setInternalState = InternalStateModule.set;
 var ARRAY_BUFFER = 'ArrayBuffer';
 var DATA_VIEW = 'DataView';
 var PROTOTYPE = 'prototype';
 var WRONG_LENGTH = 'Wrong length';
 var WRONG_INDEX = 'Wrong index';
+var getInternalArrayBufferState = InternalStateModule.getterFor(ARRAY_BUFFER);
+var getInternalDataViewState = InternalStateModule.getterFor(DATA_VIEW);
+var setInternalState = InternalStateModule.set;
 var NativeArrayBuffer = global[ARRAY_BUFFER];
 var $ArrayBuffer = NativeArrayBuffer;
 var ArrayBufferPrototype = $ArrayBuffer && $ArrayBuffer[PROTOTYPE];
@@ -68,7 +69,7 @@ var packFloat64 = function (number) {
   return packIEEE754(number, 52, 8);
 };
 
-var addGetter = function (Constructor, key) {
+var addGetter = function (Constructor, key, getInternalState) {
   defineBuiltInAccessor(Constructor[PROTOTYPE], key, {
     configurable: true,
     get: function () {
@@ -79,19 +80,19 @@ var addGetter = function (Constructor, key) {
 
 var get = function (view, count, index, isLittleEndian) {
   var intIndex = toIndex(index);
-  var store = getInternalState(view);
+  var store = getInternalDataViewState(view);
   if (intIndex + count > store.byteLength) throw RangeError(WRONG_INDEX);
-  var bytes = getInternalState(store.buffer).bytes;
+  var bytes = store.bytes;
   var start = intIndex + store.byteOffset;
   var pack = arraySlice(bytes, start, start + count);
   return isLittleEndian ? pack : reverse(pack);
 };
 
 var set = function (view, count, index, conversion, value, isLittleEndian) {
   var intIndex = toIndex(index);
-  var store = getInternalState(view);
+  var store = getInternalDataViewState(view);
   if (intIndex + count > store.byteLength) throw RangeError(WRONG_INDEX);
-  var bytes = getInternalState(store.buffer).bytes;
+  var bytes = store.bytes;
   var start = intIndex + store.byteOffset;
   var pack = conversion(+value);
   for (var i = 0; i < count; i++) bytes[start + i] = pack[isLittleEndian ? i : count - i - 1];
@@ -102,6 +103,7 @@ if (!NATIVE_ARRAY_BUFFER) {
     anInstance(this, ArrayBufferPrototype);
     var byteLength = toIndex(length);
     setInternalState(this, {
+      type: ARRAY_BUFFER,
       bytes: fill(Array(byteLength), 0),
       byteLength: byteLength
     });
@@ -116,15 +118,18 @@ if (!NATIVE_ARRAY_BUFFER) {
   $DataView = function DataView(buffer, byteOffset, byteLength) {
     anInstance(this, DataViewPrototype);
     anInstance(buffer, ArrayBufferPrototype);
-    var bufferLength = getInternalState(buffer).byteLength;
+    var bufferState = getInternalArrayBufferState(buffer);
+    var bufferLength = bufferState.byteLength;
     var offset = toIntegerOrInfinity(byteOffset);
     if (offset < 0 || offset > bufferLength) throw RangeError('Wrong offset');
     byteLength = byteLength === undefined ? bufferLength - offset : toLength(byteLength);
     if (offset + byteLength > bufferLength) throw RangeError(WRONG_LENGTH);
     setInternalState(this, {
+      type: DATA_VIEW,
       buffer: buffer,
       byteLength: byteLength,
-      byteOffset: offset
+      byteOffset: offset,
+      bytes: bufferState.bytes
     });
     if (!DESCRIPTORS) {
       this.buffer = buffer;
@@ -136,10 +141,10 @@ if (!NATIVE_ARRAY_BUFFER) {
   DataViewPrototype = $DataView[PROTOTYPE];
 
   if (DESCRIPTORS) {
-    addGetter($ArrayBuffer, 'byteLength');
-    addGetter($DataView, 'buffer');
-    addGetter($DataView, 'byteLength');
-    addGetter($DataView, 'byteOffset');
+    addGetter($ArrayBuffer, 'byteLength', getInternalArrayBufferState);
+    addGetter($DataView, 'buffer', getInternalDataViewState);
+    addGetter($DataView, 'byteLength', getInternalDataViewState);
+    addGetter($DataView, 'byteOffset', getInternalDataViewState);
   }
 
   defineBuiltIns(DataViewPrototype, {