chore: refactor some code and remove obsolete variable

lib/flushAndError.js

@@ -0,0 +1,32 @@
+'use strict'
+
+const Errors = require('redis-errors')
+
+// Flush provided queues, erroring any items with a callback first
+function flushAndError (client, message, code, options) {
+  options = options || {}
+  const queueNames = options.queues || ['commandQueue', 'offlineQueue'] // Flush the commandQueue first to keep the order intact
+  for (var i = 0; i < queueNames.length; i++) {
+    // If the command was fired it might have been processed so far
+    const ErrorClass = queueNames[i] === 'commandQueue'
+      ? Errors.InterruptError
+      : Errors.AbortError
+
+    while (client[queueNames[i]].length) {
+      const command = client[queueNames[i]].shift()
+      const err = new ErrorClass(message)
+      err.code = code
+      err.command = command.command.toUpperCase()
+      err.args = command.args
+      if (command.error) {
+        err.stack = err.stack + command.error.stack.replace(/^Error.*?\n/, '\n')
+      }
+      if (options.error) {
+        err.origin = options.error
+      }
+      command.callback(err)
+    }
+  }
+}
+
+module.exports = flushAndError