diff --git a/bin/cli.js b/bin/cli.js
index 802c487..c00b81c 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -1,171 +1,20 @@
 #!/usr/bin/env node
 'use strict'
-const cli = require('../lib/cli-data')
-const commandLineUsage = require('command-line-usage')
-const ansi = require('ansi-escape-sequences')
-const path = require('path')
-const arrayify = require('array-back')
-const t = require('typical')
-
-function ws () {
-  const usage = commandLineUsage(cli.usageData)
-
-  let options
-
-  try {
-    options = collectOptions()
-  } catch (err) {
-    stop([ `[red]{Error}: ${err.message}`, usage ], 1)
-    return
-  }
-
-  if (options.misc.help) {
-    stop(usage, 0)
-  } else if (options.misc.config) {
-    stop(JSON.stringify(options.server, null, '  '), 0)
-  } else {
-    const localWebServer = require('../')
-    const Koa = require('koa')
-
-    const valid = validateOptions(options, usage)
-    if (!valid) return
-
-    const app = new Koa()
-
-    app.on('error', err => {
-      if (options.server['log-format']) {
-        console.error(ansi.format(err.message, 'red'))
-      }
-    })
-
-    const ws = localWebServer({
-      static: {
-        root: options.server.directory,
-        options: {
-          hidden: true
-        }
-      },
-      serveIndex: {
-        path: options.server.directory,
-        options: {
-          icons: true,
-          hidden: true
-        }
-      },
-      log: {
-        format: options.server['log-format']
-      },
-      compress: options.server.compress,
-      mime: options.server.mime,
-      forbid: options.server.forbid,
-      spa: options.server.spa,
-      'no-cache': options.server['no-cache'],
-      rewrite: options.server.rewrite,
-      verbose: options.server.verbose,
-      mocks: options.server.mocks
-    })
-
-    app.use(ws)
-
-    if (options.server.https) {
-      options.server.key = path.resolve(__dirname, '..', 'ssl', '127.0.0.1.key')
-      options.server.cert = path.resolve(__dirname, '..', 'ssl', '127.0.0.1.crt')
-    }
-
-    if (options.server.key && options.server.cert) {
-      const https = require('https')
-      const fs = require('fs')
-
-      const serverOptions = {
-        key: fs.readFileSync(options.server.key),
-        cert: fs.readFileSync(options.server.cert)
-      }
-
-      const server = https.createServer(serverOptions, app.callback())
-      server.listen(options.server.port, onServerUp.bind(null, options, true))
-    } else {
-      app.listen(options.server.port, onServerUp.bind(null, options))
-    }
-  }
-}
-
-function stop (msgs, exitCode) {
-  arrayify(msgs).forEach(msg => console.error(ansi.format(msg)))
-  process.exitCode = exitCode
-}
-
-function onServerUp (options, isHttps) {
-  const ipList = getIPList(isHttps)
-    .map(iface => `[underline]{${isHttps ? 'https' : 'http'}://${iface.address}:${options.server.port}}`)
-    .join(', ')
-
-  console.error(ansi.format(
-    path.resolve(options.server.directory) === process.cwd()
-      ? `serving at ${ipList}`
-      : `serving [underline]{${options.server.directory}} at ${ipList}`
-  ))
-}
-
-function getIPList (isHttps) {
-  const flatten = require('reduce-flatten')
-  const os = require('os')
-
-  let ipList = Object.keys(os.networkInterfaces())
-    .map(key => os.networkInterfaces()[key])
-    .reduce(flatten, [])
-    .filter(iface => iface.family === 'IPv4')
-  ipList.unshift({ address: os.hostname() })
-  return ipList
-}
-
-/**
- * Return default, stored and command-line options combined
- */
-function collectOptions () {
-  const commandLineArgs = require('command-line-args')
-  const loadConfig = require('config-master')
-  const stored = loadConfig('local-web-server')
-
-  /* parse command line args */
-  let options = commandLineArgs(cli.definitions)
-
-  const builtIn = {
-    port: 8000,
-    directory: process.cwd(),
-    forbid: [],
-    rewrite: []
-  }
-
-  if (options.server.rewrite) {
-    options.server.rewrite = parseRewriteRules(options.server.rewrite)
-  }
-
-  /* override built-in defaults with stored config and then command line args */
-  options.server = Object.assign(builtIn, stored, options.server)
-  return options
-}
-
-function parseRewriteRules (rules) {
-  return rules && rules.map(rule => {
-    const matches = rule.match(/(\S*)\s*->\s*(\S*)/)
-    return {
-      from: matches[1],
-      to: matches[2]
-    }
-  })
-}
-
-function validateOptions (options, usage) {
-  let valid = true
-  function invalid (msg) {
-    return `[red underline]{Invalid:} [bold]{${msg}}`
-  }
-
-  if (!t.isNumber(options.server.port)) {
-    stop([ invalid(`--port must be numeric`), usage ], 1)
-    valid = false
-  }
-  return valid
-}
-
-ws()
+const Cli = require('../')
+
+const ws = new Cli()
+ws.middleware.addCors()
+ws.middleware.addJson()
+ws.middleware.addRewrite()
+ws.middleware.addBodyParser()
+ws.middleware.addBlacklist()
+ws.middleware.addCache()
+ws.middleware.addMimeType()
+ws.middleware.addCompression()
+ws.middleware.addLogging()
+ws.middleware.addMockResponses()
+ws.middleware.addSpa()
+
+ws.middleware.addStatic()
+ws.middleware.addIndex()
+ws.listen()
diff --git a/extend/cache-control.js b/extend/cache-control.js
index 8b2fc1d..d1c56dc 100644
--- a/extend/cache-control.js
+++ b/extend/cache-control.js
@@ -1,17 +1,24 @@
 'use strict'
-const Koa = require('koa')
-const localWebServer = require('../')
+const Cli = require('../cli')
 const cacheControl = require('koa-cache-control')
-const convert = require('koa-convert')
+const cliData = require('../lib/cli-data')
 
-const app = new Koa()
-const ws = localWebServer({
+cliData.push({ name: 'black' })
+
+const ws = new Cli({
   'no-cache': true,
   log: { format: 'dev' }
 })
 
-app.use(convert(cacheControl({
-  maxAge: 15
-})))
-app.use(ws)
-app.listen(8000)
+ws.middleware.splice(
+  ws.middleware.findIndex(m => m.name === 'mime-type'),
+  1,
+  {
+    name: 'cache-control',
+    create: convert(cacheControl({
+      maxAge: 15
+    }))
+  }
+)
+
+ws.listen()
diff --git a/lib/cli-data.js b/lib/cli-data.js
index db21ad2..bcd5fd6 100644
--- a/lib/cli-data.js
+++ b/lib/cli-data.js
@@ -1,4 +1,4 @@
-exports.definitions = [
+exports.optionDefinitions = [
   {
     name: 'port', alias: 'p', type: Number, defaultOption: true,
     description: 'Web server port.', group: 'server'
@@ -57,7 +57,7 @@ exports.definitions = [
   }
 ]
 
-exports.usageData = [
+exports.usage = [
   {
     header: 'local-web-server',
     content: 'A simple web-server for productive front-end development.'
@@ -72,12 +72,12 @@ exports.usageData = [
   },
   {
     header: 'Server options',
-    optionList: exports.definitions,
+    optionList: exports.optionDefinitions,
     group: 'server'
   },
   {
     header: 'Misc options',
-    optionList: exports.definitions,
+    optionList: exports.optionDefinitions,
     group: 'misc'
   },
   {
diff --git a/lib/local-web-server.js b/lib/local-web-server.js
index 51b4a10..8d76b36 100644
--- a/lib/local-web-server.js
+++ b/lib/local-web-server.js
@@ -1,229 +1,158 @@
+#!/usr/bin/env node
 'use strict'
+const ansi = require('ansi-escape-sequences')
 const path = require('path')
-const url = require('url')
 const arrayify = require('array-back')
+const t = require('typical')
+const Tool = require('command-line-tool')
+const tool = new Tool()
 
-/**
- * @module local-web-server
- */
-module.exports = localWebServer
+class Cli {
+  constructor () {
+    this.options = null
+    this.app = null
+    this.middleware = null
 
-/**
- * Returns a Koa application you can launch or mix into an existing app.
- *
- * @param [options] {object} - options
- * @param [options.static] {object} - koa-static config
- * @param [options.static.root=.] {string} - root directory
- * @param [options.static.options] {string} - [options](https://github.com/koajs/static#options)
- * @param [options.serveIndex] {object} - koa-serve-index config
- * @param [options.serveIndex.path=.] {string} - root directory
- * @param [options.serveIndex.options] {string} - [options](https://github.com/expressjs/serve-index#options)
- * @param [options.forbid] {string[]} - A list of forbidden routes, each route being an [express route-path](http://expressjs.com/guide/routing.html#route-paths).
- * @param [options.spa] {string} - specify an SPA file to catch requests for everything but static assets.
- * @param [options.log] {object} - [morgan](https://github.com/expressjs/morgan) config
- * @param [options.log.format] {string} - [log format](https://github.com/expressjs/morgan#predefined-formats)
- * @param [options.log.options] {object} - [options](https://github.com/expressjs/morgan#options)
- * @param [options.compress] {boolean} - Serve gzip-compressed resources, where applicable
- * @param [options.mime] {object} - A list of mime-type overrides, passed directly to [mime.define()](https://github.com/broofa/node-mime#mimedefine)
- * @param [options.rewrite] {module:local-web-server~rewriteRule[]} - One or more rewrite rules
- * @param [options.verbose] {boolean} - Print detailed output, useful for debugging
- *
- * @alias module:local-web-server
- * @return {external:KoaApplication}
- * @example
- * const localWebServer = require('local-web-server')
- * localWebServer().listen(8000)
- */
-function localWebServer (options) {
-  options = Object.assign({
-    static: {},
-    serveIndex: {
-      options: {
-        icons: true,
-        hidden: true
-      }
-    },
-    cacheControl: {},
-    spa: null,
-    log: {},
-    compress: false,
-    mime: {},
-    forbid: [],
-    rewrite: [],
-    verbose: false,
-    mocks: []
-  }, options)
+    let options = collectOptions()
+    this.options = options
 
-  if (options.verbose) {
-    process.env.DEBUG = '*'
+    if (options.misc.config) {
+      tool.stop(JSON.stringify(options.server, null, '  '), 0)
+    } else {
+      const Koa = require('koa')
+      const app = new Koa()
+      this.app = app
+
+      const MiddlewareStack = require('./middleware-stack')
+      this.middleware = new MiddlewareStack({
+        static: {
+          root: options.server.directory,
+          options: {
+            hidden: true
+          }
+        },
+        serveIndex: {
+          path: options.server.directory,
+          options: {
+            icons: true,
+            hidden: true
+          }
+        },
+        log: {
+          format: options.server['log-format']
+        },
+        compress: options.server.compress,
+        mime: options.server.mime,
+        forbid: options.server.forbid,
+        spa: options.server.spa,
+        'no-cache': options.server['no-cache'],
+        rewrite: options.server.rewrite,
+        verbose: options.server.verbose,
+        mocks: options.server.mocks
+      })
+
+      app.on('error', err => {
+        if (options.server['log-format']) {
+          console.error(ansi.format(err.message, 'red'))
+        }
+      })
+    }
   }
 
-  const log = options.log
-  log.options = log.options || {}
+  listen () {
+    this.app.use(this.middleware.getMiddleware())
+    const options = this.options
+    if (options.server.https) {
+      options.server.key = path.resolve(__dirname, '..', 'ssl', '127.0.0.1.key')
+      options.server.cert = path.resolve(__dirname, '..', 'ssl', '127.0.0.1.crt')
+    }
 
-  if (options.verbose && !log.format) {
-    log.format = 'none'
-  }
+    if (options.server.key && options.server.cert) {
+      const https = require('https')
+      const fs = require('fs')
 
-  if (!options.static.root) options.static.root = process.cwd()
-  if (!options.serveIndex.path) options.serveIndex.path = process.cwd()
-  options.rewrite = arrayify(options.rewrite)
-  options.forbid = arrayify(options.forbid)
-  options.mocks = arrayify(options.mocks)
-
-  const debug = require('debug')('local-web-server')
-  const convert = require('koa-convert')
-  const cors = require('kcors')
-  const _ = require('koa-route')
-  const json = require('koa-json')
-  const bodyParser = require('koa-bodyparser')
-  const mw = require('./middleware')
-
-  let middlewareStack = []
-
-  /* CORS: allow from any origin */
-  middlewareStack.push(cors())
-
-  /* pretty print JSON */
-  middlewareStack.push(json())
-
-  /* rewrite rules */
-  if (options.rewrite && options.rewrite.length) {
-    options.rewrite.forEach(route => {
-      if (route.to) {
-        /* `to` address is remote if the url specifies a host */
-        if (url.parse(route.to).host) {
-          debug('proxy rewrite', `${route.from} -> ${route.to}`)
-          middlewareStack.push(_.all(route.from, mw.proxyRequest(route)))
-        } else {
-          const rewrite = require('koa-rewrite')
-          const rmw = rewrite(route.from, route.to)
-          rmw._name = 'rewrite'
-          middlewareStack.push(rmw)
-        }
+      const serverOptions = {
+        key: fs.readFileSync(options.server.key),
+        cert: fs.readFileSync(options.server.cert)
       }
-    })
-  }
-
-  /* must come after rewrite. See https://github.com/nodejitsu/node-http-proxy/issues/180. */
-  middlewareStack.push(bodyParser())
 
-  /* path blacklist */
-  if (options.forbid.length) {
-    debug('forbid', options.forbid.join(', '))
-    middlewareStack.push(mw.blacklist(options.forbid))
+      const server = https.createServer(serverOptions, this.app.callback())
+      server.listen(options.server.port, onServerUp.bind(null, options, true))
+    } else {
+      this.app.listen(options.server.port, onServerUp.bind(null, options))
+    }
   }
+}
 
-  /* cache */
-  if (!options['no-cache']) {
-    const conditional = require('koa-conditional-get')
-    const etag = require('koa-etag')
-    middlewareStack.push(conditional())
-    middlewareStack.push(etag())
-  }
+function onServerUp (options, isHttps) {
+  const ipList = getIPList(isHttps)
+    .map(iface => `[underline]{${isHttps ? 'https' : 'http'}://${iface.address}:${options.server.port}}`)
+    .join(', ')
 
-  /* mime-type overrides */
-  if (options.mime) {
-    debug('mime override', JSON.stringify(options.mime))
-    middlewareStack.push(mw.mime(options.mime))
-  }
+  console.error(ansi.format(
+    path.resolve(options.server.directory) === process.cwd()
+      ? `serving at ${ipList}`
+      : `serving [underline]{${options.server.directory}} at ${ipList}`
+  ))
+}
 
-  /* compress response */
-  if (options.compress) {
-    const compress = require('koa-compress')
-    debug('compression', 'enabled')
-    middlewareStack.push(compress())
-  }
+function getIPList (isHttps) {
+  const flatten = require('reduce-flatten')
+  const os = require('os')
 
-  /* Logging */
-  if (log.format !== 'none') {
-    const morgan = require('koa-morgan')
-
-    if (!log.format) {
-      const streamLogStats = require('stream-log-stats')
-      log.options.stream = streamLogStats({ refreshRate: 500 })
-      middlewareStack.push(morgan('common', log.options))
-    } else if (log.format === 'logstalgia') {
-      morgan.token('date', logstalgiaDate)
-      middlewareStack.push(morgan('combined', log.options))
-    } else {
-      middlewareStack.push(morgan(log.format, log.options))
-    }
-  }
+  let ipList = Object.keys(os.networkInterfaces())
+    .map(key => os.networkInterfaces()[key])
+    .reduce(flatten, [])
+    .filter(iface => iface.family === 'IPv4')
+  ipList.unshift({ address: os.hostname() })
+  return ipList
+}
 
-  /* Mock Responses */
-  options.mocks.forEach(mock => {
-    if (mock.module) {
-      mock.responses = require(path.resolve(path.join(options.static.root, mock.module)))
-    }
+/**
+ * Return default, stored and command-line options combined
+ */
+function collectOptions () {
+  const loadConfig = require('config-master')
+  const stored = loadConfig('local-web-server')
+  const cli = require('../lib/cli-data')
 
-    if (mock.responses) {
-      middlewareStack.push(mw.mockResponses(mock.route, mock.responses))
-    } else if (mock.response) {
-      mock.target = {
-        request: mock.request,
-        response: mock.response
-      }
-      middlewareStack.push(mw.mockResponses(mock.route, mock.target))
-    }
-  })
+  /* parse command line args */
+  let options = tool.getOptions(cli.optionDefinitions, cli.usage)
 
-  /* for any URL not matched by static (e.g. `/search`), serve the SPA */
-  if (options.spa) {
-    const historyApiFallback = require('koa-connect-history-api-fallback')
-    debug('SPA', options.spa)
-    middlewareStack.push(historyApiFallback({
-      index: options.spa,
-      verbose: options.verbose
-    }))
+  const builtIn = {
+    port: 8000,
+    directory: process.cwd(),
+    forbid: [],
+    rewrite: []
   }
 
-  /* serve static files */
-  if (options.static.root) {
-    const serve = require('koa-static')
-    middlewareStack.push(serve(options.static.root, options.static.options))
+  if (options.server.rewrite) {
+    options.server.rewrite = parseRewriteRules(options.server.rewrite)
   }
 
-  /* serve directory index */
-  if (options.serveIndex.path) {
-    const serveIndex = require('koa-serve-index')
-    middlewareStack.push(serveIndex(options.serveIndex.path, options.serveIndex.options))
-  }
+  /* override built-in defaults with stored config and then command line args */
+  options.server = Object.assign(builtIn, stored, options.server)
 
-  const compose = require('koa-compose')
-  middlewareStack = middlewareStack.map(convert)
-  return compose(middlewareStack)
+  validateOptions(options)
+  return options
 }
 
-function logstalgiaDate () {
-  var d = new Date()
-  return (`${d.getDate()}/${d.getUTCMonth()}/${d.getFullYear()}:${d.toTimeString()}`).replace('GMT', '').replace(' (BST)', '')
+function parseRewriteRules (rules) {
+  return rules && rules.map(rule => {
+    const matches = rule.match(/(\S*)\s*->\s*(\S*)/)
+    return {
+      from: matches[1],
+      to: matches[2]
+    }
+  })
 }
 
-process.on('unhandledRejection', (reason, p) => {
-  throw reason
-})
-
-/**
- * The `from` and `to` routes are specified using [express route-paths](http://expressjs.com/guide/routing.html#route-paths)
- *
- * @example
- * ```json
- * {
- *   "rewrite": [
- *     { "from": "/css/*", "to": "/build/styles/$1" },
- *     { "from": "/npm/*", "to": "http://registry.npmjs.org/$1" },
- *     { "from": "/:user/repos/:name", "to": "https://api.github.com/repos/:user/:name" }
- *   ]
- * }
- * ```
- *
- * @typedef rewriteRule
- * @property from {string} - request route
- * @property to {string} - target route
- */
+function validateOptions (options) {
+  if (!t.isNumber(options.server.port)) {
+    tool.printError('--port must be numeric')
+    console.error(tool.usage)
+    tool.halt()
+  }
+}
 
-/**
- * @external KoaApplication
- * @see https://github.com/koajs/koa/blob/master/docs/api/index.md#application
- */
+module.exports = Cli
diff --git a/lib/middleware-stack.js b/lib/middleware-stack.js
new file mode 100644
index 0000000..e3cf187
--- /dev/null
+++ b/lib/middleware-stack.js
@@ -0,0 +1,211 @@
+'use strict'
+const arrayify = require('array-back')
+const path = require('path')
+const url = require('url')
+const debug = require('debug')('local-web-server')
+const mw = require('./middleware')
+
+class MiddlewareStack extends Array {
+  constructor (options) {
+    super()
+    options = Object.assign({
+      static: {},
+      serveIndex: {
+        options: {
+          icons: true,
+          hidden: true
+        }
+      },
+      cacheControl: {},
+      spa: null,
+      log: {},
+      compress: false,
+      mime: {},
+      forbid: [],
+      rewrite: [],
+      verbose: false,
+      mocks: []
+    }, options)
+
+    if (options.verbose) {
+      process.env.DEBUG = '*'
+    }
+
+    const log = options.log
+    log.options = log.options || {}
+
+    if (options.verbose && !log.format) {
+      log.format = 'none'
+    }
+    this.log = log
+
+    if (!options.static.root) options.static.root = process.cwd()
+    if (!options.serveIndex.path) options.serveIndex.path = process.cwd()
+    options.rewrite = arrayify(options.rewrite)
+    options.forbid = arrayify(options.forbid)
+    options.mocks = arrayify(options.mocks)
+    this.options = options
+  }
+
+  /**
+   * allow from any origin
+   */
+  addCors () {
+    this.push(require('kcors')())
+    return this
+  }
+
+  /* pretty print JSON */
+  addJson () {
+    this.push(require('koa-json')())
+    return this
+  }
+
+  /* rewrite rules */
+  addRewrite () {
+    const _ = require('koa-route')
+
+    const options = this.options.rewrite
+    if (options.length) {
+      options.forEach(route => {
+        if (route.to) {
+          /* `to` address is remote if the url specifies a host */
+          if (url.parse(route.to).host) {
+            debug('proxy rewrite', `${route.from} -> ${route.to}`)
+            this.push(_.all(route.from, mw.proxyRequest(route)))
+          } else {
+            const rewrite = require('koa-rewrite')
+            const rmw = rewrite(route.from, route.to)
+            rmw._name = 'rewrite'
+            this.push(rmw)
+          }
+        }
+      })
+    }
+    return this
+  }
+
+  /* must come after rewrite.
+  See https://github.com/nodejitsu/node-http-proxy/issues/180. */
+  addBodyParser () {
+    this.push(require('koa-bodyparser')())
+  }
+
+  /* path blacklist */
+  addBlacklist () {
+    const options = this.options.forbid
+    if (options.length) {
+      debug('forbid', options.join(', '))
+      this.push(mw.blacklist(options))
+    }
+  }
+
+  /* cache */
+  addCache () {
+    if (!this.options['no-cache']) {
+      this.push(require('koa-conditional-get')())
+      this.push(require('koa-etag')())
+    }
+  }
+
+  /* mime-type overrides */
+  addMimeType () {
+    const options = this.options.mime
+    if (options) {
+      debug('mime override', JSON.stringify(options))
+      this.push(mw.mime(options))
+    }
+  }
+
+  /* compress response */
+  addCompression () {
+    if (this.options.compress) {
+      const compress = require('koa-compress')
+      debug('compression', 'enabled')
+      this.push(compress())
+    }
+  }
+
+  /* Logging */
+  addLogging () {
+    const log = this.log
+    if (log.format !== 'none') {
+      const morgan = require('koa-morgan')
+
+      if (!log.format) {
+        const streamLogStats = require('stream-log-stats')
+        log.options.stream = streamLogStats({ refreshRate: 500 })
+        this.push(morgan('common', log.options))
+      } else if (log.format === 'logstalgia') {
+        morgan.token('date', () => {
+          var d = new Date()
+          return (`${d.getDate()}/${d.getUTCMonth()}/${d.getFullYear()}:${d.toTimeString()}`).replace('GMT', '').replace(' (BST)', '')
+        })
+        this.push(morgan('combined', log.options))
+      } else {
+        this.push(morgan(log.format, log.options))
+      }
+    }
+  }
+
+  /* Mock Responses */
+  addMockResponses () {
+    const options = this.options.mocks
+    options.forEach(mock => {
+      if (mock.module) {
+        mock.responses = require(path.resolve(path.join(this.options.static.root, mock.module)))
+      }
+
+      if (mock.responses) {
+        this.push(mw.mockResponses(mock.route, mock.responses))
+      } else if (mock.response) {
+        mock.target = {
+          request: mock.request,
+          response: mock.response
+        }
+        this.push(mw.mockResponses(mock.route, mock.target))
+      }
+    })
+  }
+
+  /* for any URL not matched by static (e.g. `/search`), serve the SPA */
+  addSpa () {
+    if (this.options.spa) {
+      const historyApiFallback = require('koa-connect-history-api-fallback')
+      debug('SPA', this.options.spa)
+      this.push(historyApiFallback({
+        index: this.options.spa,
+        verbose: this.options.verbose
+      }))
+    }
+  }
+
+  /* serve static files */
+  addStatic () {
+    const options = this.options.static
+    if (options.root) {
+      const serve = require('koa-static')
+      this.push(serve(options.root, options.options))
+    }
+    return this
+  }
+
+  /* serve directory index */
+  addIndex () {
+    const options = this.options.serveIndex
+    if (options.path) {
+      const serveIndex = require('koa-serve-index')
+      this.push(serveIndex(options.path, options.options))
+    }
+    return this
+  }
+
+  getMiddleware (options) {
+    const compose = require('koa-compose')
+    const convert = require('koa-convert')
+    const middlewareStack = this.map(convert)
+    return compose(middlewareStack)
+  }
+}
+
+module.exports = MiddlewareStack
diff --git a/package.json b/package.json
index cad8837..8e22610 100644
--- a/package.json
+++ b/package.json
@@ -31,8 +31,7 @@
   "dependencies": {
     "ansi-escape-sequences": "^2.2.2",
     "array-back": "^1.0.3",
-    "command-line-args": "^3.0.0",
-    "command-line-usage": "^3.0.1",
+    "command-line-tool": "75lb/command-line-tool",
     "config-master": "^2.0.2",
     "debug": "^2.2.0",
     "http-proxy": "^1.13.3",