chore - remove standard and use individual config

Standard is not as up to date and still uses a old eslint version.
Instead, use the airbnb default with a couple of modifications.

All required changes are included.

lib/multi.js

@@ -4,6 +4,7 @@ const Queue = require('denque')
 const Errors = require('redis-errors')
 const Command = require('./command')
 const utils = require('./utils')
+
 const handleReply = utils.handleReply
 
 /**
@@ -15,7 +16,7 @@ const handleReply = utils.handleReply
  * @param {number} index Command index in the Multi queue
  * @returns *
  */
-function pipelineTransactionCommand (multi, command, index) {
+function pipelineTransactionCommand(multi, command, index) {
   // Queueing is done first, then the commands are executed
   const tmp = command.callback
   command.callback = function (err, reply) {
@@ -37,7 +38,7 @@ function pipelineTransactionCommand (multi, command, index) {
  * @param {any[]} replies
  * @returns any[]
  */
-function multiCallback (multi, replies) {
+function multiCallback(multi, replies) {
   if (replies) {
     var i = 0
     const queue = multi._queue
@@ -70,13 +71,11 @@ function multiCallback (multi, replies) {
  * @param {Multi} multi
  * @returns Promise<any[]>
  */
-function execTransaction (multi) {
+function execTransaction(multi) {
   const client = multi._client
   const queue = multi._queue
   if (multi._monitoring || client._monitoring) {
-    const err = new RangeError(
-      'Using transaction with a client that is in monitor mode does not work due to faulty return values of Redis.'
-    )
+    const err = new RangeError('Using transaction with a client that is in monitor mode does not work due to faulty return values of Redis.')
     err.command = 'EXEC'
     err.code = 'EXECABORT'
     return new Promise((resolve, reject) => {
@@ -89,16 +88,19 @@ function execTransaction (multi) {
   // Silently ignore this error. We'll receive the error for the exec as well
   const promises = [client.internalSendCommand(new Command('multi', [])).catch(() => {})]
   // Drain queue, callback will catch 'QUEUED' or error
-  for (var index = 0; index < len; index++) {
+  for (let index = 0; index < len; index++) {
     // The commands may not be shifted off, since they are needed in the result handler
-    promises.push(pipelineTransactionCommand(multi, queue.peekAt(index), index).catch((e) => e))
+    promises.push(pipelineTransactionCommand(multi, queue.peekAt(index), index).catch(e => e))
   }
 
   const main = client.internalSendCommand(new Command('exec', []))
-  return Promise.all(promises).then(() => main.then((replies) => multiCallback(multi, replies)).catch((err) => {
-    err.errors = multi._errors
-    return Promise.reject(err)
-  }))
+  return Promise.all(promises)
+    .then(() => main
+      .then(replies => multiCallback(multi, replies))
+      .catch((err) => {
+        err.errors = multi._errors
+        return Promise.reject(err)
+      }))
 }
 
 /**
@@ -107,7 +109,7 @@ function execTransaction (multi) {
  * @param {Multi} multi
  * @returns Promise<any[]>
  */
-function execBatch (multi) {
+function execBatch(multi) {
   const client = multi._client
   const queue = multi._queue
   if (queue.length === 0) {
@@ -119,13 +121,14 @@ function execBatch (multi) {
     })
   }
   var error = false
+  function setError(err) {
+    error = true
+    return err
+  }
   const promises = []
   while (queue.length) {
     const command = queue.shift()
-    promises.push(client.internalSendCommand(command).catch((e) => {
-      error = true
-      return e
-    }))
+    promises.push(client.internalSendCommand(command).catch(setError))
   }
   return Promise.all(promises).then((res) => {
     if (error) {
@@ -147,14 +150,14 @@ class Multi {
    *
    * @memberof Multi
    */
-  constructor (client, type, args) {
+  constructor(client, type, args) {
     this._client = client
     this._type = type
     this._queue = new Queue()
     // Either undefined or an array. Fail hard if it's not an array
     if (args) {
       // Legacy support for passing in an array of arguments
-      for (var i = 0; i < args.length; i++) {
+      for (let i = 0; i < args.length; i++) {
         const command = args[i][0]
         const tmpArgs = args[i].slice(1)
         if (Array.isArray(command)) {
@@ -173,7 +176,7 @@ class Multi {
    *
    * @memberof Multi
    */
-  execAtomic () {
+  execAtomic() {
     if (this._queue.length < 2) {
       return this.execBatch()
     }
@@ -187,7 +190,7 @@ class Multi {
    *
    * @memberof Multi
    */
-  exec () {
+  exec() {
     if (this._type === 'batch') {
       return execBatch(this)
     }