fix(server): replace optimist on yargs lib (karma-runner#3451)

fix karma-runner#2473

lib/cli.js

@@ -2,7 +2,7 @@
 
 const path = require('path')
 const assert = require('assert')
-const optimist = require('optimist')
+const yargs = require('yargs')
 const fs = require('graceful-fs')
 
 const Server = require('./server')
@@ -11,7 +11,7 @@ const constant = require('./constants')
 
 function processArgs (argv, options, fs, path) {
   if (argv.help) {
-    console.log(optimist.help())
+    console.log(yargs.help())
     process.exit(0)
   }
 
@@ -152,7 +152,7 @@ function argsBeforeDoubleDash (argv) {
 }
 
 function describeShared () {
-  optimist
+  yargs
     .usage('Karma - Spectacular Test Runner for JavaScript.\n\n' +
       'Usage:\n' +
       '  $0 <command>\n\n' +
@@ -167,7 +167,7 @@ function describeShared () {
 }
 
 function describeInit () {
-  optimist
+  yargs
     .usage('Karma - Spectacular Test Runner for JavaScript.\n\n' +
       'INIT - Initialize a config file.\n\n' +
       'Usage:\n' +
@@ -179,7 +179,7 @@ function describeInit () {
 }
 
 function describeStart () {
-  optimist
+  yargs
     .usage('Karma - Spectacular Test Runner for JavaScript.\n\n' +
       'START - Start the server / do a single run.\n\n' +
       'Usage:\n' +
@@ -205,7 +205,7 @@ function describeStart () {
 }
 
 function describeRun () {
-  optimist
+  yargs
     .usage('Karma - Spectacular Test Runner for JavaScript.\n\n' +
       'RUN - Run the tests (requires running server).\n\n' +
       'Usage:\n' +
@@ -221,7 +221,7 @@ function describeRun () {
 }
 
 function describeStop () {
-  optimist
+  yargs
     .usage('Karma - Spectacular Test Runner for JavaScript.\n\n' +
       'STOP - Stop the server (requires running server).\n\n' +
       'Usage:\n' +
@@ -232,7 +232,7 @@ function describeStop () {
 }
 
 function describeCompletion () {
-  optimist
+  yargs
     .usage('Karma - Spectacular Test Runner for JavaScript.\n\n' +
       'COMPLETION - Bash/ZSH completion for karma.\n\n' +
       'Installation:\n' +
@@ -245,7 +245,7 @@ function printRunnerProgress (data) {
 }
 
 exports.process = function () {
-  const argv = optimist.parse(argsBeforeDoubleDash(process.argv.slice(2)))
+  const argv = yargs.parse(argsBeforeDoubleDash(process.argv.slice(2)))
   const options = {
     cmd: argv._.shift()
   }
@@ -280,7 +280,7 @@ exports.process = function () {
       } else {
         console.error('Unknown command "' + options.cmd + '".')
       }
-      optimist.showHelp()
+      yargs.showHelp()
       process.exit(1)
   }