--- /dev/null
+'use strict';
+var ArrayBufferViewCore = require('../internals/array-buffer-view-core');
+var $groupBy = require('../internals/array-group-by');
+var typedArraySpeciesConstructor = require('../internals/typed-array-species-constructor');
+
+var aTypedArray = ArrayBufferViewCore.aTypedArray;
+var exportTypedArrayMethod = ArrayBufferViewCore.exportTypedArrayMethod;
+
+// `%TypedArray%.prototype.groupBy` method
+// https://github.com/tc39/proposal-array-grouping
+exportTypedArrayMethod('groupBy', function groupBy(callbackfn /* , thisArg */) {
+ var thisArg = arguments.length > 1 ? arguments[1] : undefined;
+ return $groupBy(aTypedArray(this), callbackfn, thisArg, typedArraySpeciesConstructor);
+});