Replace xtend dependency with Object.assign()

abstract-leveldown.js

@@ -1,4 +1,3 @@
-var xtend = require('xtend')
 var supports = require('level-supports')
 var Buffer = require('buffer').Buffer
 var AbstractIterator = require('./abstract-iterator')
@@ -163,7 +162,7 @@ AbstractLevelDOWN.prototype.batch = function (array, options, callback) {
       return nextTick(callback, new Error('batch(array) element must be an object and not `null`'))
     }
 
-    var e = xtend(array[i])
+    var e = Object.assign({}, array[i])
 
     if (e.type !== 'put' && e.type !== 'del') {
       return nextTick(callback, new Error("`type` must be 'put' or 'del'"))

package.json

@@ -20,8 +20,7 @@
     "buffer": "^6.0.3",
     "immediate": "^3.2.3",
     "level-concat-iterator": "~2.0.0",
-    "level-supports": "~1.0.0",
-    "xtend": "~4.0.0"
+    "level-supports": "~1.0.0"
   },
   "devDependencies": {
     "airtap": "^4.0.3",

test/iterator-range-test.js

@@ -1,5 +1,4 @@
 var collectEntries = require('level-concat-iterator')
-var xtend = require('xtend')
 
 var db
 
@@ -50,7 +49,7 @@ exports.range = function (test, testCommon) {
     // Test the documented promise that in reverse mode,
     // "the returned entries are the same, but in reverse".
     if (!opts.reverse && !('limit' in opts)) {
-      var reverseOpts = xtend(opts, { reverse: true })
+      var reverseOpts = Object.assign({}, opts, { reverse: true })
 
       rangeTest(
         name + ' (flipped)',