add all frontend files

node_modules/es-abstract/2017/IsDetachedBuffer.js

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+'use strict';
+
+var $TypeError = require('es-errors/type');
+
+var $byteLength = require('array-buffer-byte-length');
+var availableTypedArrays = require('available-typed-arrays')();
+var callBound = require('call-bound');
+var isArrayBuffer = require('is-array-buffer');
+var isSharedArrayBuffer = require('is-shared-array-buffer');
+
+var $sabByteLength = callBound('SharedArrayBuffer.prototype.byteLength', true);
+
+// https://262.ecma-international.org/8.0/#sec-isdetachedbuffer
+
+module.exports = function IsDetachedBuffer(arrayBuffer) {
+	var isSAB = isSharedArrayBuffer(arrayBuffer);
+	if (!isArrayBuffer(arrayBuffer) && !isSAB) {
+		throw new $TypeError('Assertion failed: `arrayBuffer` must be an Object with an [[ArrayBufferData]] internal slot');
+	}
+	if ((isSAB ? $sabByteLength : $byteLength)(arrayBuffer) === 0) {
+		try {
+			new global[availableTypedArrays[0]](arrayBuffer); // eslint-disable-line no-new
+		} catch (error) {
+			return !!error && error.name === 'TypeError';
+		}
+	}
+	return false;
+};