🎉 Remove external dependencies

index.js

@@ -1,11 +1,15 @@
-var isArrayBuffer = require('is-array-buffer-x')
+var toString = Object.prototype.toString
 
 var isModern = (
   typeof Buffer.alloc === 'function' &&
   typeof Buffer.allocUnsafe === 'function' &&
   typeof Buffer.from === 'function'
 )
 
+function isArrayBuffer (input) {
+  return toString.call(input).slice(8, -1) === 'ArrayBuffer'
+}
+
 function fromArrayBuffer (obj, byteOffset, length) {
   byteOffset >>>= 0
 

package.json

@@ -12,8 +12,5 @@
   "keywords": [
     "buffer",
     "buffer from"
-  ],
-  "dependencies": {
-    "is-array-buffer-x": "^1.0.13"
-  }
+  ]
 }