diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..3136f83
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,15 @@
+{
+    "exclude": ["node_modules/**", "bundles/**", "performance/**", "logo/**", "examples/**"],
+      "presets": [
+        [
+          "@babel/preset-env",
+          {
+            "modules": false,
+            "shippedProposals": true
+          }
+        ]
+      ],
+      "plugins": [
+        "@babel/plugin-proposal-class-properties"
+      ]
+}
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 6449b25..a5441ab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ cache:
 notifications:
   email: false
 node_js:
-  - "8"
+  - 8
 before_install:
   - npm i -g npm@^6.0.0
 before_script:
diff --git a/examples/basic.html b/examples/basic.html
index 777c007..fd5dab1 100644
--- a/examples/basic.html
+++ b/examples/basic.html
@@ -18,7 +18,7 @@
 <body>
 <div class="container">
 </div>
-<script src="../full/Tween.js"></script>
+<script src="../bundled/Tween.js"></script>
 <script>
 
 var body = document.body;
@@ -40,7 +40,7 @@
 	body.textContent = JSON.stringify(object);
 }).start();
 
-var tween = new TWEEN.Tween({x:'i am here 600 year'}).to({x:'i am here 200 year'}, 2000).delay(3000).on('update', function (object) {
+var tween = new TWEEN.Tween({x:'600 y.o'}).to({x:'200 y.o'}, 2000).delay(3000).on('update', function (object) {
 	//round(object);
 	body.textContent = JSON.stringify(object);
 }).start();
diff --git a/examples/test.html b/examples/test.html
index ed18ef2..02fad01 100644
--- a/examples/test.html
+++ b/examples/test.html
@@ -25,9 +25,8 @@
 
 	<div id="container"></div>
 
-	<script src="../full/Tween.js"></script>
-	<script src="../../es6-tween-plugins/renderer/render.js"></script>
-	<script !src="../../es6-tween-plugins/transform/transform.js"></script>
+	<script src="../bundled/Tween.js"></script>
+	<script src="https://unpkg.com/es6tween-plugin-render@0.0.16/render.min.js"></script>
 	<script>
 		TWEEN.autoPlay(true);
 
diff --git a/package.json b/package.json
index ec8701e..8615fd6 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "prepublishOnly": "yarn lint && yarn doc && yarn doc-md",
     "doc": "npx jsdoc --readme README.md --configure jsdoc.json --verbose",
     "doc-md": "npx jsdoc2md src/** > API.md",
-    "test": "yarn lint && yarn source && npx ava --verbose",
+    "test": "yarn lint && npm run source && npx ava",
     "lint": "npx eslint ./src",
     "lint-fix": "npx eslint ./src --fix"
   },
@@ -55,9 +55,22 @@
     "husky": "^1.3.1",
     "jsdoc": "^3.5.5",
     "jsdoc-to-markdown": "^3.1.0-1",
+    "puppeteer": "^1.12.2",
     "rollup": "^1.2.3",
     "rollup-plugin-babel": "^4.3.2",
     "uglify-js": "^3.4.9"
   },
-  "dependencies": {}
+  "dependencies": {},
+  "ava": {
+    "verbose": true,
+    "require": [
+      "esm"
+    ],
+    "babel": {
+			"extensions": [
+				"js",
+				"mjs"
+			]
+		}
+  }
 }
diff --git a/rollup.config.js b/rollup.config.js
index dfb5a15..88e913d 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -10,21 +10,6 @@ export default {
   },
   context: 'this',
   plugins: [
-    babel({
-      babelrc: false,
-      exclude: ['node_modules/**', 'bundles/**', 'performance/**', 'logo/**', 'examples/**'],
-      presets: [
-        [
-          '@babel/preset-env',
-          {
-            modules: false,
-            shippedProposals: true
-          }
-        ]
-      ],
-      plugins: [
-        '@babel/plugin-proposal-class-properties'
-      ]
-    })
+    babel()
   ]
 }
diff --git a/src/Tween.js b/src/Tween.js
index 1c21366..442cb7b 100644
--- a/src/Tween.js
+++ b/src/Tween.js
@@ -2,7 +2,8 @@ import {
   add,
   now,
   Plugins,
-  remove
+  remove,
+  isRunning
 } from './core'
 import Easing from './Easing'
 import Interpolation from './Interpolation'
@@ -101,7 +102,7 @@ class Tween {
       object = this.object = NodeCache(node, object, this)
     }
     this._valuesEnd = null
-    this._valuesStart = {}
+    this._valuesStart = Array.isArray(object) ? [] : {}
 
     this._duration = 1000
     this._easingFunction = defaultEasing
@@ -733,7 +734,7 @@ class Tween {
 
       let delta = time - _prevTime
       this._prevTime = time
-      if (delta > TOO_LONG_FRAME_MS) {
+      if (delta > TOO_LONG_FRAME_MS && isRunning()) {
         time -= delta - FRAME_MS
       }
 
diff --git a/src/core.js b/src/core.js
index 6ff4905..24c6eeb 100644
--- a/src/core.js
+++ b/src/core.js
@@ -1,5 +1,5 @@
 /* global process */
-import { requestAnimationFrame, root } from './shim'
+import { requestAnimationFrame, cancelAnimationFrame, root } from './shim'
 
 /**
  * Get browser/Node.js current time-stamp
@@ -54,6 +54,7 @@ let _onRequestTick = []
 const _ticker = requestAnimationFrame
 let emptyFrame = 0
 let powerModeThrottle = 120
+let _tick
 
 const onRequestTick = (fn) => {
   _onRequestTick.push(fn)
@@ -86,10 +87,8 @@ const add = (tween) => {
   emptyFrame = 0
 
   if (_autoPlay && !isStarted) {
-    _ticker(update)
+    _tick = _ticker(update)
     isStarted = true
-  } else {
-    _requestTick()
   }
 }
 
@@ -110,7 +109,7 @@ const onTick = (fn) => _tweens.push({ update: fn })
  * TWEEN.FrameThrottle(60)
  */
 const FrameThrottle = (frameCount = 120) => {
-  powerModeThrottle = frameCount
+  powerModeThrottle = frameCount * 1.05
 }
 
 /**
@@ -137,6 +136,7 @@ const autoPlay = (state) => {
  */
 const removeAll = () => {
   _tweens.length = 0
+  cancelAnimationFrame(_tick)
 }
 
 /**
@@ -178,6 +178,9 @@ const remove = (tween) => {
   if (i !== -1) {
     _tweens.splice(i, 1)
   }
+  if (_tweens.length === 0) {
+    cancelAnimationFrame(_tick)
+  }
 }
 
 /**
@@ -193,11 +196,12 @@ const update = (time = now(), preserve) => {
   if (emptyFrame >= powerModeThrottle) {
     isStarted = false
     emptyFrame = 0
+    cancelAnimationFrame(_tick)
     return false
   }
 
   if (_autoPlay && isStarted) {
-    _ticker(update)
+    _tick = _ticker(update)
   } else {
     _requestTick()
   }
diff --git a/src/index.js b/src/index.js
index faa9744..a70c1cf 100644
--- a/src/index.js
+++ b/src/index.js
@@ -19,6 +19,7 @@ import Interpolation from './Interpolation'
 import Tween from './Tween'
 import Selector from './selector'
 import Interpolator from './Interpolator'
+import * as utils from './constants'
 import './shim'
 export {
   Plugins,
@@ -39,5 +40,6 @@ export {
   FrameThrottle,
   Tween,
   Easing,
-  Interpolation
+  Interpolation,
+  utils
 }
diff --git a/test.js b/test.js
index ff4bdc4..6eff7ab 100644
--- a/test.js
+++ b/test.js
@@ -1,5 +1,10 @@
+/* global TWEEN */
+
 import test from 'ava'
-const { Easing, Tween, update, getAll, removeAll } = require('./bundled/Tween')
+
+import { Easing, Tween, update, getAll, removeAll } from './src'
+
+import browserTestMiddleware from './withPage'
 
 test('Events', t => {
   let tween = new Tween({ x: 0 })
@@ -196,3 +201,178 @@ test('Tween update should be run against all tween each time', t => {
 
   t.deepEqual(order, [0, 1, 2])
 })
+
+test('Headless tests', browserTestMiddleware, (t, page) => {
+  return page.evaluate(() => {
+    const deepArrayCopy = arr => arr.map(child => Array.isArray(child)
+      ? deepArrayCopy(child) : Object.keys(child) && Object.keys(child).length
+        ? Object.assign({}, child) : child)
+
+    const tests = []
+
+    const obj = { x: 0, y: [50, 'String test 100'] }
+    const obj2 = { x: 0 }
+    const arr1 = [ [ 100 ], { f: 200 } ]
+
+    const tween1 = new TWEEN.Tween(obj)
+      .to({ x: 200, y: [100, 'String test 200'] }, 2000)
+      .on('start', () => {
+        tests.push({
+          method: 'log',
+          successMessage: 'on:start event works as excepted'
+        })
+      })
+      .once('update', () => {
+        tests.push({
+          method: 'log',
+          successMessage: 'on:update event works as excepted'
+        })
+      })
+      .on('complete', () => {
+        tests.push({
+          method: 'log',
+          successMessage: 'on:complete event works as excepted'
+        })
+      })
+    const tween2 = new TWEEN.Tween(obj2).to({ x: 200 }, 4000).easing(TWEEN.Easing.Elastic.InOut)
+    const tween3 = new TWEEN.Tween(arr1).to([ [ 0 ], { f: 100 } ], 2000)
+
+    tween1.start(0)
+    tween2.start(0)
+    tween3.start(0)
+
+    tests.push({
+      method: 'is',
+      a: obj.x,
+      b: 0,
+      failMessage: 'ID: ObjX_24U'
+    })
+    tests.push({
+      method: 'is',
+      a: obj.y[0],
+      b: 50,
+      failMessage: 'ID: ObjY_25C'
+    })
+    tests.push({
+      method: 'is',
+      a: obj.y[1],
+      b: 'String test 100',
+      failMessage: 'ID: ObjY_26G'
+    })
+    tests.push({
+      method: 'is',
+      a: obj2.x,
+      b: 0,
+      failMessage: 'ID: ObjX_26Z'
+    })
+    tests.push({
+      method: 'is',
+      a: arr1[0][0],
+      b: 100,
+      failMessage: 'ID: ObjA_27L'
+    })
+    tests.push({
+      method: 'is',
+      a: arr1[1].f,
+      b: 200,
+      failMessage: 'ID: ObjF_27X'
+    })
+
+    TWEEN.update(1000)
+
+    tests.push({
+      method: 'is',
+      a: obj.x,
+      b: 100,
+      failMessage: 'There something wrong with number interpolation',
+      successMessage: 'Number interpolation works as excepted'
+    })
+    tests.push({
+      method: 'is',
+      a: obj.y[0],
+      b: 75,
+      failMessage: 'There something wrong with Array number interpolation',
+      successMessage: 'Array Number interpolation works as excepted'
+    })
+    tests.push({
+      method: 'is',
+      a: obj.y[1],
+      b: 'String test 150',
+      failMessage: 'There something wrong with Array string interpolation',
+      successMessage: 'Array string interpolation works as excepted'
+    })
+    tests.push({
+      method: 'not',
+      a: obj2.x,
+      b: 50,
+      failMessage: 'Easing not works properly or tween instance not handles easing function properly',
+      successMessage: 'Easing function works properly'
+    })
+    tests.push({
+      method: 'deepEqual',
+      a: deepArrayCopy(arr1),
+      b: [ [ 50 ], { f: 150 } ],
+      failMessage: 'Array-based tween failed due of internal processor/instance and/or something failed within core',
+      successMessage: 'Array-based tweens works properly'
+    })
+
+    TWEEN.update(2000)
+
+    tests.push({
+      method: 'is',
+      a: obj.x,
+      b: 200,
+      failMessage: 'ID: ObjX_32R'
+    })
+    tests.push({
+      method: 'is',
+      a: obj.y[0],
+      b: 100,
+      failMessage: 'ID: ObjY_33V'
+    })
+    tests.push({
+      method: 'is',
+      a: obj.y[1],
+      b: 'String test 200',
+      failMessage: 'ID: ObjY_33S'
+    })
+    tests.push({
+      method: 'not',
+      a: obj2.x,
+      b: 200,
+      failMessage: 'ID: ObjY_34I'
+    })
+    tests.push({
+      method: 'is',
+      a: arr1[0][0],
+      b: 0,
+      failMessage: 'ID: ObjA_34P'
+    })
+    tests.push({
+      method: 'is',
+      a: arr1[1].f,
+      b: 100,
+      failMessage: 'ID: ObjF_35T'
+    })
+
+    TWEEN.update(4000)
+
+    tests.push({
+      method: 'is',
+      a: obj2.x,
+      b: 200,
+      failMessage: 'ID: ObjY_36K'
+    })
+
+    return tests
+  }).then(tests => {
+    tests.map(({ method, a, b, failMessage, successMessage }) => {
+      if (method === 'log') {
+        t.log(successMessage)
+      } else {
+        t[method](a, b, failMessage)
+        successMessage && t.log(successMessage)
+      }
+    })
+  })
+})
diff --git a/withPage.js b/withPage.js
new file mode 100644
index 0000000..0cec747
--- /dev/null
+++ b/withPage.js
@@ -0,0 +1,22 @@
+import puppeteer from 'puppeteer'
+
+const fs = require('fs')
+const path = require('path')
+
+export default (t, run) => {
+  let _browser
+  return puppeteer.launch({ headless: true, args: ['--no-sandbox'] }).then(browser => {
+    _browser = browser
+    return browser.newPage().then(page => {
+      return page.evaluate(
+        fs.readFileSync(path.join(__dirname, 'bundled/Tween.js'), 'utf8')
+      ).then(() => page)
+    }).then((page) => {
+      return run(t, page).then(() => page)
+    })
+  })
+    .then((page) => {
+      _browser.close()
+      page.close()
+    })
+}
diff --git a/yarn.lock b/yarn.lock
index 01a624a..1f28b91 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -676,6 +676,13 @@ acorn@^6.0.7, acorn@^6.1.0:
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.1.0.tgz#b0a3be31752c97a0f7013c5f4903b71a05db6818"
   integrity sha512-MW/FjM+IvU9CgBzjO3UIPCE2pyEwUsoFl+VGdczOPEdxfGFjuKny/gN54mOuX7Qxmb9Rg9MCn2oKiSUeW+pjrw==
 
+agent-base@^4.1.0:
+  version "4.2.1"
+  resolved "https://registry.yarnpkg.com/agent-base/-/agent-base-4.2.1.tgz#d89e5999f797875674c07d87f260fc41e83e8ca9"
+  integrity sha512-JVwXMr9nHYTUXsBFKUqhJwvlcYU/blreOEUkhNR2eXZIvwd+c+o5V4MgDPKWnMS/56awN3TRzIP+KoPn+roQtg==
+  dependencies:
+    es6-promisify "^5.0.0"
+
 ajv@^6.9.1:
   version "6.9.2"
   resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.9.2.tgz#4927adb83e7f48e5a32b45729744c71ec39c9c7b"
@@ -840,6 +847,11 @@ async-each@^1.0.1:
   resolved "https://registry.yarnpkg.com/async-each/-/async-each-1.0.1.tgz#19d386a1d9edc6e7c1c85d388aedbcc56d33602d"
   integrity sha1-GdOGodntxufByF04iu28xW0zYC0=
 
+async-limiter@~1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.0.tgz#78faed8c3d074ab81f22b4e985d79e8738f720f8"
+  integrity sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg==
+
 async@^1.4.0:
   version "1.5.2"
   resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
@@ -1354,6 +1366,16 @@ concat-map@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
 
+concat-stream@1.6.2:
+  version "1.6.2"
+  resolved "https://registry.yarnpkg.com/concat-stream/-/concat-stream-1.6.2.tgz#904bdf194cd3122fc675c77fc4ac3d4ff0fd1a34"
+  integrity sha512-27HBghJxjiZtIk3Ycvn/4kbJk/1uZuJFfuPEns6LaEvpvG1f0hTea8lilrouyo9mVc2GWdcEZ8OLoGmSADlrCw==
+  dependencies:
+    buffer-from "^1.0.0"
+    inherits "^2.0.3"
+    readable-stream "^2.2.2"
+    typedarray "^0.0.6"
+
 concordance@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/concordance/-/concordance-4.0.0.tgz#5932fdee397d129bdbc3a1885fbe69839b1b7e15"
@@ -1475,12 +1497,19 @@ date-time@^2.1.0:
   dependencies:
     time-zone "^1.0.0"
 
-debug@^2.1.2, debug@^2.2.0, debug@^2.3.3, debug@^2.6.8, debug@^2.6.9:
+debug@2.6.9, debug@^2.1.2, debug@^2.2.0, debug@^2.3.3, debug@^2.6.8, debug@^2.6.9:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
   dependencies:
     ms "2.0.0"
 
+debug@^3.1.0:
+  version "3.2.6"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-3.2.6.tgz#e83d17de16d8a7efb7717edbe5fb10135eee629b"
+  integrity sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==
+  dependencies:
+    ms "^2.1.1"
+
 debug@^4.0.1, debug@^4.1.0, debug@^4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/debug/-/debug-4.1.1.tgz#3b72260255109c6b589cee050f1d516139664791"
@@ -1673,6 +1702,18 @@ es6-error@^4.0.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/es6-error/-/es6-error-4.1.1.tgz#9e3af407459deed47e9a91f9b885a84eb05c561d"
 
+es6-promise@^4.0.3:
+  version "4.2.6"
+  resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-4.2.6.tgz#b685edd8258886365ea62b57d30de28fadcd974f"
+  integrity sha512-aRVgGdnmW2OiySVPUC9e6m+plolMAJKjZnQlCwNSuK5yQ0JN61DZSO1X1Ufd1foqWRAlig0rhduTCHe7sVtK5Q==
+
+es6-promisify@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/es6-promisify/-/es6-promisify-5.0.0.tgz#5109d62f3e56ea967c4b63505aef08291c8a5203"
+  integrity sha1-UQnWLz5W6pZ8S2NQWu8IKRyKUgM=
+  dependencies:
+    es6-promise "^4.0.3"
+
 escape-string-regexp@^1.0.4, escape-string-regexp@^1.0.5, escape-string-regexp@~1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
@@ -1934,6 +1975,16 @@ extglob@^2.0.4:
     snapdragon "^0.8.1"
     to-regex "^3.0.1"
 
+extract-zip@^1.6.6:
+  version "1.6.7"
+  resolved "https://registry.yarnpkg.com/extract-zip/-/extract-zip-1.6.7.tgz#a840b4b8af6403264c8db57f4f1a74333ef81fe9"
+  integrity sha1-qEC0uK9kAyZMjbV/Txp0Mz74H+k=
+  dependencies:
+    concat-stream "1.6.2"
+    debug "2.6.9"
+    mkdirp "0.5.1"
+    yauzl "2.4.1"
+
 fast-deep-equal@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
@@ -1951,6 +2002,13 @@ fast-levenshtein@~2.0.4:
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz#3d8a5c66883a16a30ca8643e851f19baa7797917"
 
+fd-slicer@~1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/fd-slicer/-/fd-slicer-1.0.1.tgz#8b5bcbd9ec327c5041bf9ab023fd6750f1177e65"
+  integrity sha1-i1vL2ewyfFBBv5qwI/1nUPEXfmU=
+  dependencies:
+    pend "~1.2.0"
+
 figures@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/figures/-/figures-2.0.0.tgz#3ab1a2d2a62c8bfb431a0c94cb797a2fce27c962"
@@ -2255,6 +2313,14 @@ hosted-git-info@^2.1.4:
   version "2.6.0"
   resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-2.6.0.tgz#23235b29ab230c576aab0d4f13fc046b0b038222"
 
+https-proxy-agent@^2.2.1:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/https-proxy-agent/-/https-proxy-agent-2.2.1.tgz#51552970fa04d723e04c56d04178c3f92592bbc0"
+  integrity sha512-HPCTS1LW51bcyMYbxUIOO4HEOlQ1/1qRaFWcyxvwaqUS9TY88aoEuHUY33kuAh1YhVVaDQhLZsnPd+XNARWZlQ==
+  dependencies:
+    agent-base "^4.1.0"
+    debug "^3.1.0"
+
 husky@^1.3.1:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/husky/-/husky-1.3.1.tgz#26823e399300388ca2afff11cfa8a86b0033fae0"
@@ -3005,6 +3071,11 @@ micromatch@^3.1.10, micromatch@^3.1.4:
     snapdragon "^0.8.1"
     to-regex "^3.0.2"
 
+mime@^2.0.3:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/mime/-/mime-2.4.0.tgz#e051fd881358585f3279df333fe694da0bcffdd6"
+  integrity sha512-ikBcWwyqXQSHKtciCcctu9YfPbFYZ4+gbHEmE0Q8jzcTYQg5dHCr3g2wwAZjPoJfQVXZq6KXAjpXOTf5/cjT7w==
+
 mimic-fn@^1.0.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.2.0.tgz#820c86a39334640e99516928bd03fca88057d022"
@@ -3062,7 +3133,7 @@ mkdirp2@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/mkdirp2/-/mkdirp2-1.0.3.tgz#cc8dd8265f1f06e2d8f5b10b6e52f4e050bed21b"
 
-mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.1:
+mkdirp@0.5.1, mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
   dependencies:
@@ -3447,6 +3518,11 @@ path-type@^3.0.0:
   dependencies:
     pify "^3.0.0"
 
+pend@~1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/pend/-/pend-1.2.0.tgz#7a57eb550a6783f9115331fcf4663d5c8e007a50"
+  integrity sha1-elfrVQpng/kRUzH89GY9XI4AelA=
+
 pify@^2.0.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
@@ -3532,6 +3608,16 @@ progress@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/progress/-/progress-2.0.0.tgz#8a1be366bf8fc23db2bd23f10c6fe920b4389d1f"
 
+progress@^2.0.1:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/progress/-/progress-2.0.3.tgz#7e8cf8d8f5b8f239c1bc68beb4eb78567d572ef8"
+  integrity sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA==
+
+proxy-from-env@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/proxy-from-env/-/proxy-from-env-1.0.0.tgz#33c50398f70ea7eb96d21f7b817630a55791c7ee"
+  integrity sha1-M8UDmPcOp+uW0h97gXYwpVeRx+4=
+
 pseudomap@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/pseudomap/-/pseudomap-1.0.2.tgz#f052a28da70e618917ef0a8ac34c1ae5a68286b3"
@@ -3548,6 +3634,20 @@ punycode@^2.1.0:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
 
+puppeteer@^1.12.2:
+  version "1.12.2"
+  resolved "https://registry.yarnpkg.com/puppeteer/-/puppeteer-1.12.2.tgz#dbc36afc3ba2d7182b1a37523c0081a0e8507c9a"
+  integrity sha512-xWSyCeD6EazGlfnQweMpM+Hs6X6PhUYhNTHKFj/axNZDq4OmrVERf70isBf7HsnFgB3zOC1+23/8+wCAZYg+Pg==
+  dependencies:
+    debug "^4.1.0"
+    extract-zip "^1.6.6"
+    https-proxy-agent "^2.2.1"
+    mime "^2.0.3"
+    progress "^2.0.1"
+    proxy-from-env "^1.0.0"
+    rimraf "^2.6.1"
+    ws "^6.1.0"
+
 quick-lru@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/quick-lru/-/quick-lru-1.1.0.tgz#4360b17c61136ad38078397ff11416e186dcfbb8"
@@ -3613,7 +3713,7 @@ read-pkg@^4.0.1:
     parse-json "^4.0.0"
     pify "^3.0.0"
 
-readable-stream@^2.0.2, readable-stream@^2.0.6:
+readable-stream@^2.0.2, readable-stream@^2.0.6, readable-stream@^2.2.2:
   version "2.3.6"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
   dependencies:
@@ -4412,6 +4512,11 @@ type-check@~0.3.2:
   dependencies:
     prelude-ls "~1.1.2"
 
+typedarray@^0.0.6:
+  version "0.0.6"
+  resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
+  integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
+
 typical@^2.4.2, typical@^2.6.0, typical@^2.6.1:
   version "2.6.1"
   resolved "https://registry.yarnpkg.com/typical/-/typical-2.6.1.tgz#5c080e5d661cbbe38259d2e70a3c7253e873881d"
@@ -4667,6 +4772,13 @@ write@1.0.3:
   dependencies:
     mkdirp "^0.5.1"
 
+ws@^6.1.0:
+  version "6.1.4"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-6.1.4.tgz#5b5c8800afab925e94ccb29d153c8d02c1776ef9"
+  integrity sha512-eqZfL+NE/YQc1/ZynhojeV8q+H050oR8AZ2uIev7RU10svA9ZnJUddHcOUZTJLinZ9yEfdA2kSATS2qZK5fhJA==
+  dependencies:
+    async-limiter "~1.0.0"
+
 xdg-basedir@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-3.0.0.tgz#496b2cc109eca8dbacfe2dc72b603c17c5870ad4"
@@ -4703,3 +4815,10 @@ yargs@~3.10.0:
     cliui "^2.1.0"
     decamelize "^1.0.0"
     window-size "0.1.0"
+
+yauzl@2.4.1:
+  version "2.4.1"
+  resolved "https://registry.yarnpkg.com/yauzl/-/yauzl-2.4.1.tgz#9528f442dab1b2284e58b4379bb194e22e0c4005"
+  integrity sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=
+  dependencies:
+    fd-slicer "~1.0.1"
