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build/node_modules/is-array-buffer-x/index.js

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+/**
+ * @file Detect whether or not an object is an ArrayBuffer.
+ * @version 1.7.0
+ * @author Xotic750 <Xotic750@gmail.com>
+ * @copyright  Xotic750
+ * @license {@link <https://opensource.org/licenses/MIT> MIT}
+ * @module is-array-buffer-x
+ */
+
+/* global ArrayBuffer */
+
+'use strict';
+
+var attempt = require('attempt-x');
+var isObjectLike = require('is-object-like-x');
+var hasABuf = typeof ArrayBuffer === 'function';
+var bLength = false;
+var toStringTag;
+var aBufTag;
+
+if (hasABuf) {
+  if (require('has-to-string-tag-x')) {
+    var getOwnPropertyDescriptor = require('object-get-own-property-descriptor-x');
+    var descriptor = getOwnPropertyDescriptor(ArrayBuffer.prototype, 'byteLength');
+    if (descriptor && typeof descriptor.get === 'function') {
+      var res = attempt(function () {
+        return new ArrayBuffer(4);
+      });
+
+      if (res.threw === false && isObjectLike(res.value)) {
+        res = attempt.call(res.value, descriptor.get);
+        bLength = res.threw === false && typeof res.value === 'number' && descriptor.get;
+      }
+    }
+  }
+
+  if (bLength === false) {
+    toStringTag = require('to-string-tag-x');
+    aBufTag = '[object ArrayBuffer]';
+  }
+}
+
+/**
+ * Determine if an `object` is an `ArrayBuffer`.
+ *
+ * @param {*} object - The object to test.
+ * @returns {boolean} `true` if the `object` is an `ArrayBuffer`,
+ *  else false`.
+ * @example
+ * var isArrayBuffer = require('is-array-buffer-x');
+ *
+ * isArrayBuffer(new ArrayBuffer(4)); // true
+ * isArrayBuffer(null); // false
+ * isArrayBuffer([]); // false
+ */
+module.exports = function isArrayBuffer(object) {
+  if (hasABuf === false || isObjectLike(object) === false) {
+    return false;
+  }
+
+  if (bLength === false) {
+    return toStringTag(object) === aBufTag;
+  }
+
+  var result = attempt.call(object, bLength);
+  return result.threw === false && typeof result.value === 'number';
+};