Breaking: modernize syntax and bump standard (Level/community#98)

Author: vweevers

.github/dependabot.yml

@@ -7,5 +7,3 @@ updates:
     ignore:
       - dependency-name: dependency-check
       - dependency-name: nyc
-      - dependency-name: standard
-      - dependency-name: tempy

example.js

@@ -1,13 +1,14 @@
-var iteratorStream = require('./')
-var leveldown = require('leveldown')
-var path = require('path')
+const iteratorStream = require('.')
+const leveldown = require('leveldown')
+const path = require('path')
+
+const db = leveldown(path.join(__dirname, 'db'))
 
-var db = leveldown(path.join(__dirname, 'db'))
 db.open(function (err) {
   if (err) throw err
 
-  var ops = []
-  for (var i = 0; i < 1000; i++) {
+  const ops = []
+  for (let i = 0; i < 1000; i++) {
     ops.push({
       type: 'put',
       key: String(Math.random()),
@@ -18,7 +19,7 @@ db.open(function (err) {
   db.batch(ops, function (err) {
     if (err) throw err
 
-    var stream = iteratorStream(db.iterator())
+    const stream = iteratorStream(db.iterator())
     stream.on('data', function (kv) {
       console.log('%s -> %s', kv.key, kv.value)
     })

index.js

@@ -1,14 +1,15 @@
-var inherits = require('inherits')
-var Readable = require('readable-stream').Readable
-var extend = require('xtend')
+'use strict'
+
+const inherits = require('inherits')
+const { Readable } = require('readable-stream')
 
 module.exports = ReadStream
 inherits(ReadStream, Readable)
 
 function ReadStream (iterator, options) {
   if (!(this instanceof ReadStream)) return new ReadStream(iterator, options)
   options = options || {}
-  Readable.call(this, extend(options, {
+  Readable.call(this, Object.assign({}, options, {
     objectMode: true
   }))
   this._iterator = iterator
@@ -17,22 +18,20 @@ function ReadStream (iterator, options) {
 }
 
 ReadStream.prototype._read = function () {
-  var self = this
-  var options = this._options
   if (this.destroyed) return
 
-  this._iterator.next(function (err, key, value) {
-    if (self.destroyed) return
-    if (err) return self.destroy(err)
+  this._iterator.next((err, key, value) => {
+    if (this.destroyed) return
+    if (err) return this.destroy(err)
 
     if (key === undefined && value === undefined) {
-      self.push(null)
-    } else if (options.keys !== false && options.values === false) {
-      self.push(key)
-    } else if (options.keys === false && options.values !== false) {
-      self.push(value)
+      this.push(null)
+    } else if (this._options.keys !== false && this._options.values === false) {
+      this.push(key)
+    } else if (this._options.keys === false && this._options.values !== false) {
+      this.push(value)
     } else {
-      self.push({ key: key, value: value })
+      this.push({ key, value })
     }
   })
 }

package.json

@@ -12,8 +12,7 @@
   },
   "dependencies": {
     "inherits": "^2.0.4",
-    "readable-stream": "^3.4.0",
-    "xtend": "^4.0.2"
+    "readable-stream": "^3.4.0"
   },
   "devDependencies": {
     "coveralls": "^3.0.2",
@@ -24,9 +23,9 @@
     "leveldown": "^5.0.0",
     "nyc": "^14.0.0",
     "secret-event-listener": "^1.0.0",
-    "standard": "^14.0.0",
+    "standard": "^16.0.3",
     "tape": "^5.0.1",
-    "tempy": "0.2.1",
+    "tempy": "^1.0.1",
     "through2": "^4.0.2"
   },
   "hallmark": {