diff --git a/README.md b/README.md
index 6e6e3a3..2571638 100644
--- a/README.md
+++ b/README.md
@@ -145,35 +145,22 @@ Signature is not required for this part
 
 ## Websocket Datafeed
 
-DEMO:
-```
-// ws demo
-const datafeed = new API.websocket.Datafeed();
-
-// close callback
-datafeed.onClose(() => {
-  console.log('ws closed, status ', datafeed.trustConnected);
-});
-
-// connect
-datafeed.connectSocket();
-
-// subscribe
-const topic = `/market/ticker:BTC-USDT`;
-const callbackId = datafeed.subscribe(topic, (message) => {
-  if (message.topic === topic) {
-    console.log(message.data);
-  }
-});
-
-console.log(`subscribe id: ${callbackId}`);
-setTimeout(() => {
-  // unsubscribe
-  datafeed.unsubscribe(topic, callbackId);
-  console.log(`unsubscribed: ${topic} ${callbackId}`);  
-}, 5000);
+### API.websocket.Datafeed
 
-```
+Manage websocket connect/private/subscribe/unsubscribe and get realtime datafeed.
+
+DEMO: [demo/ticker_demo.js](demo/ticker_demo.js)
+
+### API.websocket.Level2
+
+Get realtime orderbook in level2 datafeed.
+
+DEMO: [demo/level2_demo.js](demo/level2_demo.js)
+
+
+### API.websocket.Level3
+
+// TODO
 
 ## LICENSE
 
diff --git a/demo/index.js b/demo/index.js
index ada5055..1c5e916 100644
--- a/demo/index.js
+++ b/demo/index.js
@@ -10,31 +10,5 @@ const main = async () => {
   console.log(getStatusRl);
 };
 
-// run demo
+// run rest main
 main();
-
-// ws demo
-const datafeed = new API.websocket.Datafeed();
-
-// close callback
-datafeed.onClose(() => {
-  console.log('ws closed, status ', datafeed.trustConnected);
-});
-
-// connect
-datafeed.connectSocket();
-
-// subscribe
-const topic = `/market/ticker:BTC-USDT`;
-const callbackId = datafeed.subscribe(topic, (message) => {
-  if (message.topic === topic) {
-    console.log(message.data);
-  }
-});
-
-console.log(`subscribe id: ${callbackId}`);
-setTimeout(() => {
-  // unsubscribe
-  datafeed.unsubscribe(topic, callbackId);
-  console.log(`unsubscribed: ${topic} ${callbackId}`);  
-}, 5000);
diff --git a/demo/level2_demo.js b/demo/level2_demo.js
new file mode 100644
index 0000000..a4672f5
--- /dev/null
+++ b/demo/level2_demo.js
@@ -0,0 +1,70 @@
+const _ = require('lodash');
+const logUpdate = require('log-update');
+const API = require('../src');
+
+const config = require('./config');
+API.init({
+  ...config,
+  baseUrl: 'https://api.kucoin.io',
+});
+
+// ws demo
+const datafeed = new API.websocket.Datafeed();
+
+/*
+// close callback
+datafeed.onClose(() => {
+  console.log('ws closed, status ', datafeed.trustConnected);
+});
+
+// connect
+datafeed.connectSocket();
+
+// subscribe
+const topic = `/market/level2:BTC-USDT`;
+const callbackId = datafeed.subscribe(topic, (message) => {
+  if (message.topic === topic) {
+    console.log(JSON.stringify(message.data));
+  }
+});
+
+console.log(`subscribe id: ${callbackId}`);
+setTimeout(() => {
+  // unsubscribe
+  datafeed.unsubscribe(topic, callbackId);
+  console.log(`unsubscribed: ${topic} ${callbackId}`);  
+}, 5000);
+*/
+
+const { Level2 } = API.websocket;
+
+Level2.setLogger(() => {});
+
+const l2 = new Level2('BTC-USDT', datafeed);
+l2.listen();
+
+const interval = setInterval(async () => {
+  // read orderbook
+  const orderbook = l2.getOrderBook(5);
+
+  // show Level2
+  let asksStr = '';
+  _.eachRight(orderbook.asks, ([price, size]) => {
+    asksStr += `${price} -> ${size}\n`;
+  });
+
+  let bidsStr = '';
+  _.each(orderbook.bids, ([price, size]) => {
+    bidsStr += `${price} -> ${size}\n`;
+  });
+
+  logUpdate.clear();
+  logUpdate(`------------------------\n` +
+    `l2 ${orderbook.dirty ? 'Dirty Data' : 'Trust Data'}\n` +
+    `l2 seq:  ${orderbook.sequence}\n` +
+    `ping:    ${orderbook.ping} (ms)\n` +
+    `------------------------\n` +
+    `${asksStr}----------sep-----------\n` +
+    `${bidsStr}------------------------`
+  );
+}, 200);
diff --git a/demo/ticker_demo.js b/demo/ticker_demo.js
new file mode 100644
index 0000000..65ade8d
--- /dev/null
+++ b/demo/ticker_demo.js
@@ -0,0 +1,29 @@
+const API = require('../src');
+
+API.init(require('./config'));
+
+// ws demo
+const datafeed = new API.websocket.Datafeed();
+
+// close callback
+datafeed.onClose(() => {
+  console.log('ws closed, status ', datafeed.trustConnected);
+});
+
+// connect
+datafeed.connectSocket();
+
+// subscribe
+const topic = `/market/ticker:BTC-USDT`;
+const callbackId = datafeed.subscribe(topic, (message) => {
+  if (message.topic === topic) {
+    console.log(message.data);
+  }
+});
+
+console.log(`subscribe id: ${callbackId}`);
+setTimeout(() => {
+  // unsubscribe
+  datafeed.unsubscribe(topic, callbackId);
+  console.log(`unsubscribed: ${topic} ${callbackId}`);  
+}, 5000);
diff --git a/package.json b/package.json
index b4a2c56..24dfab8 100755
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
   "dependencies": {
     "event-emitter": "^0.3.5",
     "lodash": "^4.17.15",
+    "log-update": "^4.0.0",
     "md5": "^2.2.1",
     "node-fetch": "^2.6.0",
     "node-schedule": "^1.3.2",
diff --git a/src/datafeed/Level2.js b/src/datafeed/Level2.js
new file mode 100644
index 0000000..6c65921
--- /dev/null
+++ b/src/datafeed/Level2.js
@@ -0,0 +1,248 @@
+const _ = require('lodash');
+const Datafeed = require('../lib/datafeed');
+const Http = require('../lib/http');
+const delay = require('../lib/delay');
+const {
+  checkL2BufferContinue,
+  mapArr,
+  arrMap,
+} = require('../lib/utils');
+const OrderBook = require('../rest/Market/OrderBook');
+
+let log = (...args) => { console.log(...args); };
+const changeTypes = ['asks', 'bids'];
+
+class Level2 {
+  constructor(symbol, datafeed) {
+    this.buffer = [];
+    this.fullSnapshot = {
+      dirty: true,
+      sequence: 0,
+      asks: {},
+      bids: {},
+    };
+    this.messageEventCallback = null;
+
+    this.symbol = symbol;
+    if (datafeed instanceof Datafeed) {
+      this.datafeed = datafeed;
+    } else {
+      this.datafeed = new Datafeed();
+    }
+
+    /** private */
+    this._rebuilding = false;
+
+    /** bind functions */
+    this.bufferMessage = this.bufferMessage.bind(this);
+    this.getFilteredBuffer = this.getFilteredBuffer.bind(this);
+    this.rebuild = this.rebuild.bind(this);
+    this.fetch = this.fetch.bind(this);
+    this.updateFullByMessage = this.updateFullByMessage.bind(this);
+    this.listen = this.listen.bind(this);
+    this.handleMessageEvent = this.handleMessageEvent.bind(this);
+    this.getOrderBook = this.getOrderBook.bind(this);
+  }
+
+  /**
+   * @name setLogger
+   * @description set level2 mod log
+   * @param {function} fn 
+   */
+  static setLogger(fn) {
+    if (typeof fn === 'function') {
+      log = fn;
+    }
+  }
+
+  bufferMessage(message) {
+    const { sequenceStart, sequenceEnd, changes } = message || {};
+    if (sequenceStart && sequenceEnd && changes) {
+      const lastSeq = this.fullSnapshot.sequence;
+      // log('check', sequenceStart, lastSeq);
+      if (this.fullSnapshot.dirty === false && sequenceStart === lastSeq + 1) {
+        // update
+        this.updateFullByMessage(message);
+      } else {
+        this.buffer.push(message);
+        // rebuild
+        this.rebuild();
+      }
+    }
+  }
+
+  getFilteredBuffer(lastSeq) {
+    const seq = lastSeq + 1;
+    const buffer = this.buffer.filter((message) => {
+      const { sequenceStart, sequenceEnd, changes } = message || {};
+      return (sequenceStart <= seq && sequenceEnd >= seq) || sequenceStart >= seq;
+    });
+    // console.log(buffer);
+
+    // check changes seq
+    if(buffer[0]) {
+      const { sequenceStart, sequenceEnd, symbol, changes } = buffer[0];
+      const { asks, bids } = changes;
+
+      const fAsks = asks.filter(item => +item[2] == seq);
+      const fBids = bids.filter(item => +item[2] == seq);
+      if (!fAsks[0] && !fBids[0]) {
+        return [];
+      }
+
+      buffer[0] = {
+        sequenceStart: seq,
+        sequenceEnd,
+        symbol,
+        changes: {
+          asks: asks.filter(item => +item[2] >= seq),
+          bids: bids.filter(item => +item[2] >= seq),
+        },
+      }
+    }
+
+    return buffer;
+  }
+
+  async rebuild() {
+    if (this._rebuilding) {
+      log('rebuilding dirty level2, return',
+          this.fullSnapshot.sequence,
+          this.buffer.length && this.buffer[this.buffer.length - 1].sequenceEnd,
+      );
+      return;
+    }
+    log('build dirty level2');
+    this._rebuilding = true;
+    this.fullSnapshot.dirty = true;
+
+    await delay(5000);
+    const fetchSuccess = await this.fetch();
+    const lastSeq = this.fullSnapshot.sequence;
+
+    if (fetchSuccess && this.datafeed.trustConnected) {
+      const bufferArr = this.getFilteredBuffer(lastSeq);
+      // if (bufferArr.length === 0 && this.buffer.length > 0) {
+      //   console.log('snapshot before', lastSeq, this.buffer[this.buffer.length - 1].sequenceEnd);
+      // }
+
+      if (bufferArr.length > 0 ||
+        (bufferArr.length === 0 && this.buffer.length === 0) ||
+        (bufferArr.length === 0 && (lastSeq === this.buffer[this.buffer.length - 1].sequenceEnd))
+      ) {
+        const continu = checkL2BufferContinue(bufferArr, lastSeq);
+        if (continu) {
+          log('lastSeq & len', this.fullSnapshot.sequence, bufferArr.length, this.buffer.length);
+          _.each(bufferArr, (item) => {
+            // update
+            this.updateFullByMessage(item);
+          });
+          this.fullSnapshot.dirty = false;
+          this.buffer = [];
+          log('level2 checked');
+        } else {
+          log('level2 buffer is not continue with snapshot');
+        }
+      }
+    }
+    this._rebuilding = false;
+  }
+
+  async fetch() {
+    /*
+    {
+      code: '200000',
+      data: {
+        sequence: 75017803,
+        asks: [],
+        bids: [],
+      }
+    }
+    */
+    let fetchSuccess = false;
+    try {
+      const result = await OrderBook.getLevel2_full(this.symbol);
+      // console.log(result);
+      if (result.code === '200000' && result.data) {
+        const { sequence, asks, bids } = result.data;
+
+        this.fullSnapshot.dirty = true;
+        this.fullSnapshot.sequence = +sequence;
+        this.fullSnapshot.asks = mapArr(asks);
+        this.fullSnapshot.bids = mapArr(bids);
+        fetchSuccess = true;
+      }
+    } catch (e) {
+      log('fetch level2 error', e);
+    }
+    return fetchSuccess;
+  }
+
+  updateFullByMessage(message) {
+    const { sequenceStart, sequenceEnd, changes } = message || {};
+    // const [sequence, price, type, size] = message;
+    
+    _.each(changes, (arr, targetType) => {
+      if (_.indexOf(changeTypes, targetType) > -1) {
+        _.each(arr, (item) => {
+          const [price, size, sequence] = item;
+          if (size == 0) {
+            delete this.fullSnapshot[targetType][price];
+          } else {
+            this.fullSnapshot[targetType][price] = size;
+          }
+          this.fullSnapshot.sequence = +sequence;
+        });
+      }
+    });
+    this.fullSnapshot.sequence = +sequenceEnd;
+    
+    // callback message
+    if (typeof this.messageEventCallback === 'function') {
+      this.messageEventCallback(message);
+    }
+  }
+
+  /** public */
+  listen() {
+    this.datafeed.connectSocket();
+    this.datafeed.onClose(() => {
+      log('ws closed, status ', this.datafeed.trustConnected);
+      this.rebuild();
+    });
+
+    const topic = `/market/level2:${this.symbol}`;
+    this.datafeed.subscribe(topic, (message) => {
+      if (message.topic === topic) {
+        // log(message.data);
+        this.bufferMessage(message.data);
+      }
+    });
+    this.rebuild();
+  }
+
+  // message event handler
+  handleMessageEvent(callback) {
+    if (typeof callback === 'function') {
+      this.messageEventCallback = callback;
+    }
+  }
+
+  getOrderBook(limit = 10) {
+    const dirty = this.fullSnapshot.dirty;
+    const sequence = this.fullSnapshot.sequence;
+    const asks = arrMap(this.fullSnapshot.asks, 'asc').slice(0, limit);
+    const bids = arrMap(this.fullSnapshot.bids, 'desc').slice(0, limit);
+    const ping = this.datafeed.ping;
+
+    return {
+      dirty,
+      sequence,
+      asks,
+      bids,
+      ping,
+    };
+  }
+}
+
+module.exports = Level2;
diff --git a/src/index.js b/src/index.js
index 2458e38..58a8e4d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -47,4 +47,5 @@ exports.rest = {
 /** Exports Datafeed */
 exports.websocket = {
   Datafeed: require('./lib/datafeed'),
+  Level2: require('./datafeed/Level2'),
 };
diff --git a/src/lib/delay.js b/src/lib/delay.js
new file mode 100644
index 0000000..25e162b
--- /dev/null
+++ b/src/lib/delay.js
@@ -0,0 +1,11 @@
+const _ = require('lodash');
+
+const delay = (ms = 1000) => {
+  return new Promise((resolve) => {
+    _.delay(() => {
+      resolve();
+    }, ms);
+  });
+};
+
+module.exports = delay;
diff --git a/src/lib/utils.js b/src/lib/utils.js
index 8facddd..9905b17 100755
--- a/src/lib/utils.js
+++ b/src/lib/utils.js
@@ -1,3 +1,4 @@
+const _ = require('lodash');
 const CryptoJS = require('crypto');
 const path =  require('path');
 const fs = require('fs');
@@ -10,9 +11,7 @@ function sign(text, secret, outputType = 'base64') {
     .digest(outputType);
 }
 
-exports.sign = sign;
-
-exports.auth = function auth(ApiKey, method, url, data) {
+function auth(ApiKey, method, url, data) {
   const timestamp = Date.now();
   const signature = sign(timestamp + method.toUpperCase() + url + data, ApiKey.secret);
 
@@ -25,8 +24,7 @@ exports.auth = function auth(ApiKey, method, url, data) {
   };
 }
 
-
-exports.readFile = async function readFile(filePath) {
+async function readFile(filePath) {
   const fileAbsolutePath = path.join(__dirname, filePath);
   // console.log(fileAbsolutePath);
   const readStream = fs.createReadStream(fileAbsolutePath);
@@ -44,7 +42,7 @@ exports.readFile = async function readFile(filePath) {
   });
 }
 
-exports.writeFile = async function writeFile(filePath, content) {
+async function writeFile(filePath, content) {
   const fileAbsolutePath = path.join(__dirname, filePath);
   const writeStream = fs.createWriteStream(fileAbsolutePath);
 
@@ -58,15 +56,13 @@ exports.writeFile = async function writeFile(filePath, content) {
       resolve(err.message);
     });
   });
-
 }
 
-
-exports.genClientOid = function genClientOid() {
+function genClientOid() {
   return uuid.v4();
 }
 
-exports.strTo2String = function strTo2String(str) {
+function strTo2String(str) {
   var result = [];
   var list = str.split("");
   for (var i = 0; i < list.length; i++) {
@@ -76,3 +72,92 @@ exports.strTo2String = function strTo2String(str) {
   }
   return result.join("");
 }
+
+function checkL2BufferContinue(arrBuffer = [], lastSeq) {
+  if (arrBuffer.length) {
+    if (arrBuffer[0].sequenceStart !== lastSeq +1) {
+      return false;
+    }
+    
+    for (let i = 0; i < arrBuffer.length; i++) {
+      if (arrBuffer[i + 1] && arrBuffer[i + 1].sequenceStart !== arrBuffer[i].sequenceEnd + 1) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+// ----> for level2
+function mapArr(arr = [], parseKey = (str) => str) {
+  const res = {};
+  for (let i = 0; i< arr.length; i++) {
+    const item = arr[i];
+    res[parseKey(item[0])] = item[1];
+  }
+  return res;
+}
+
+// ----> for level2
+function arrMap(map = {}, order = 'asc') {
+  const res = [];
+  _.each(map, (value, key) => {
+    res.push([key, value]);
+  });
+  res.sort((a, b) => {
+    if (order === 'desc') {
+      return (+b[0]) - (+a[0]);
+    } else {
+      return (a[0]) - (b[0]);
+    }
+  });
+  return res;
+}
+
+// ----> for level3
+function mapl3Arr(arr = []) {
+  const res = {};
+  for (let i = 0; i< arr.length; i++) {
+    const item = arr[i];
+    res[item[1]] = item; // orderId
+  }
+  return res;
+}
+
+// ----> for level3
+function arrl3Map(map = {}, side, order = 'asc', merge = 1) {
+  const res = [];
+  _.each(map, (item) => {
+    // [下单时间, 订单号, 价格, 数量, 进入买卖盘时间]
+    const [orderTime, orderId, price, size, ts] = item;
+    res.push([price, size, ts, orderId]);
+  });
+  res.sort((a, b) => {
+    if (a[0] === b[0]) {
+      // 价格相同的订单以进入买卖盘的时间从低到高排序
+      return a[2] - b[2];
+    } else {
+      // 价格排序
+      if (order === 'desc') {
+        return b[0] - a[0];
+      } else {
+        return a[0] - b[0];
+      }
+    }
+  });
+  return res;
+}
+
+module.exports = {
+  sign,
+  auth,
+  readFile,
+  writeFile,
+  genClientOid,
+  strTo2String,
+  checkL2BufferContinue,
+  mapArr,
+  arrMap,
+  mapl3Arr,
+  arrl3Map,
+};
diff --git a/yarn.lock b/yarn.lock
index 87d046f..3f22c19 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,6 +2,11 @@
 # yarn lockfile v1
 
 
+"@types/color-name@^1.1.1":
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
+  integrity sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==
+
 abbrev@1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8"
@@ -14,11 +19,23 @@ ansi-align@^2.0.0:
   dependencies:
     string-width "^2.0.0"
 
+ansi-escapes@^4.3.0:
+  version "4.3.1"
+  resolved "https://registry.yarnpkg.com/ansi-escapes/-/ansi-escapes-4.3.1.tgz#a5c47cc43181f1f38ffd7076837700d395522a61"
+  integrity sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==
+  dependencies:
+    type-fest "^0.11.0"
+
 ansi-regex@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
   integrity sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=
 
+ansi-regex@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-5.0.0.tgz#388539f55179bf39339c81af30a654d69f87cb75"
+  integrity sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==
+
 ansi-styles@^3.2.1:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
@@ -26,6 +43,14 @@ ansi-styles@^3.2.1:
   dependencies:
     color-convert "^1.9.0"
 
+ansi-styles@^4.0.0:
+  version "4.2.1"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-4.2.1.tgz#90ae75c424d008d2624c5bf29ead3177ebfcf359"
+  integrity sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==
+  dependencies:
+    "@types/color-name" "^1.1.1"
+    color-convert "^2.0.1"
+
 anymatch@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-2.0.0.tgz#bcb24b4f37934d9aa7ac17b4adaf89e7c76ef2eb"
@@ -59,6 +84,11 @@ assign-symbols@^1.0.0:
   resolved "https://registry.yarnpkg.com/assign-symbols/-/assign-symbols-1.0.0.tgz#59667f41fadd4f20ccbc2bb96b8d4f7f78ec0367"
   integrity sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=
 
+astral-regex@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-2.0.0.tgz#483143c567aeed4785759c0865786dc77d7d2e31"
+  integrity sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ==
+
 async-each@^1.0.1:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/async-each/-/async-each-1.0.3.tgz#b727dbf87d7651602f06f4d4ac387f47d91b0cbf"
@@ -214,6 +244,13 @@ cli-boxes@^1.0.0:
   resolved "https://registry.yarnpkg.com/cli-boxes/-/cli-boxes-1.0.0.tgz#4fa917c3e59c94a004cd61f8ee509da651687143"
   integrity sha1-T6kXw+WclKAEzWH47lCdplFocUM=
 
+cli-cursor@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/cli-cursor/-/cli-cursor-3.1.0.tgz#264305a7ae490d1d03bf0c9ba7c925d1753af307"
+  integrity sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==
+  dependencies:
+    restore-cursor "^3.1.0"
+
 collection-visit@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/collection-visit/-/collection-visit-1.0.0.tgz#4bc0373c164bc3291b4d368c829cf1a80a59dca0"
@@ -229,11 +266,23 @@ color-convert@^1.9.0:
   dependencies:
     color-name "1.1.3"
 
+color-convert@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-2.0.1.tgz#72d3a68d598c9bdb3af2ad1e84f21d896abd4de3"
+  integrity sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==
+  dependencies:
+    color-name "~1.1.4"
+
 color-name@1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
   integrity sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=
 
+color-name@~1.1.4:
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.4.tgz#c2a09a87acbde69543de6f63fa3995c826c536a2"
+  integrity sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==
+
 component-emitter@^1.2.1:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/component-emitter/-/component-emitter-1.3.0.tgz#16e4070fba8ae29b679f2215853ee181ab2eabc0"
@@ -389,6 +438,11 @@ duplexer3@^0.1.4:
   resolved "https://registry.yarnpkg.com/duplexer3/-/duplexer3-0.1.4.tgz#ee01dd1cac0ed3cbc7fdbea37dc0a8f1ce002ce2"
   integrity sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=
 
+emoji-regex@^8.0.0:
+  version "8.0.0"
+  resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-8.0.0.tgz#e818fd69ce5ccfcb404594f842963bf53164cc37"
+  integrity sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==
+
 es5-ext@^0.10.35, es5-ext@^0.10.50, es5-ext@~0.10.14:
   version "0.10.53"
   resolved "https://registry.yarnpkg.com/es5-ext/-/es5-ext-0.10.53.tgz#93c5a3acfdbef275220ad72644ad02ee18368de1"
@@ -720,6 +774,11 @@ is-fullwidth-code-point@^2.0.0:
   resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz#a3b30a5c4f199183167aaab93beefae3ddfb654f"
   integrity sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=
 
+is-fullwidth-code-point@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz#f116f8064fe90b3f7844a38997c0b75051269f1d"
+  integrity sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==
+
 is-glob@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-3.1.0.tgz#7ba5ae24217804ac70707b96922567486cc3e84a"
@@ -858,6 +917,16 @@ lodash@^4.17.15:
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
   integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
 
+log-update@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/log-update/-/log-update-4.0.0.tgz#589ecd352471f2a1c0c570287543a64dfd20e0a1"
+  integrity sha512-9fkkDevMefjg0mmzWFBW8YkFP91OrizzkW3diF7CpG+S2EYdy4+TVfGwz1zeF8x7hCx1ovSPTOE9Ngib74qqUg==
+  dependencies:
+    ansi-escapes "^4.3.0"
+    cli-cursor "^3.1.0"
+    slice-ansi "^4.0.0"
+    wrap-ansi "^6.2.0"
+
 long-timeout@0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/long-timeout/-/long-timeout-0.1.1.tgz#9721d788b47e0bcb5a24c2e2bee1a0da55dab514"
@@ -923,6 +992,11 @@ micromatch@^3.1.10, micromatch@^3.1.4:
     snapdragon "^0.8.1"
     to-regex "^3.0.2"
 
+mimic-fn@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-2.1.0.tgz#7ed2c2ccccaf84d3ffcb7a69b57711fc2083401b"
+  integrity sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==
+
 minimatch@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
@@ -1076,6 +1150,13 @@ object.pick@^1.3.0:
   dependencies:
     isobject "^3.0.1"
 
+onetime@^5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/onetime/-/onetime-5.1.0.tgz#fff0f3c91617fe62bb50189636e99ac8a6df7be5"
+  integrity sha512-5NcSkPHhwTVFIQN+TUqXoS5+dlElHXdpAWu9I0HP20YOtIi+aZ0Ct82jdlILDxjLEAWwvm+qj1m6aEtsDVmm6Q==
+  dependencies:
+    mimic-fn "^2.1.0"
+
 p-finally@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/p-finally/-/p-finally-1.0.0.tgz#3fbcfb15b899a44123b34b6dcc18b724336a2cae"
@@ -1226,6 +1307,14 @@ resolve-url@^0.2.1:
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
   integrity sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=
 
+restore-cursor@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/restore-cursor/-/restore-cursor-3.1.0.tgz#39f67c54b3a7a58cea5236d95cf0034239631f7e"
+  integrity sha512-l+sSefzHpj5qimhFSE5a8nufZYAM3sBSVMAPtYkmC+4EH2anSGaEMXSD0izRQbu9nfyQ9y5JrVmp7E8oZrUjvA==
+  dependencies:
+    onetime "^5.1.0"
+    signal-exit "^3.0.2"
+
 ret@~0.1.10:
   version "0.1.15"
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
@@ -1299,6 +1388,15 @@ signal-exit@^3.0.0, signal-exit@^3.0.2:
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.3.tgz#a1410c2edd8f077b08b4e253c8eacfcaf057461c"
   integrity sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==
 
+slice-ansi@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/slice-ansi/-/slice-ansi-4.0.0.tgz#500e8dd0fd55b05815086255b3195adf2a45fe6b"
+  integrity sha512-qMCMfhY040cVHT43K9BFygqYbUPFZKHOg7K73mtTWJRb8pyP3fzf4Ixd5SzdEJQ6MRUg/WBnOLxghZtKKurENQ==
+  dependencies:
+    ansi-styles "^4.0.0"
+    astral-regex "^2.0.0"
+    is-fullwidth-code-point "^3.0.0"
+
 snapdragon-node@^2.0.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/snapdragon-node/-/snapdragon-node-2.1.1.tgz#6c175f86ff14bdb0724563e8f3c1b021a286853b"
@@ -1378,6 +1476,15 @@ string-width@^2.0.0, string-width@^2.1.1:
     is-fullwidth-code-point "^2.0.0"
     strip-ansi "^4.0.0"
 
+string-width@^4.1.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/string-width/-/string-width-4.2.0.tgz#952182c46cc7b2c313d1596e623992bd163b72b5"
+  integrity sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==
+  dependencies:
+    emoji-regex "^8.0.0"
+    is-fullwidth-code-point "^3.0.0"
+    strip-ansi "^6.0.0"
+
 string_decoder@~1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.1.1.tgz#9cf1611ba62685d7030ae9e4ba34149c3af03fc8"
@@ -1392,6 +1499,13 @@ strip-ansi@^4.0.0:
   dependencies:
     ansi-regex "^3.0.0"
 
+strip-ansi@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-6.0.0.tgz#0b1571dd7669ccd4f3e06e14ef1eed26225ae532"
+  integrity sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==
+  dependencies:
+    ansi-regex "^5.0.0"
+
 strip-eof@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/strip-eof/-/strip-eof-1.0.0.tgz#bb43ff5598a6eb05d89b59fcd129c983313606bf"
@@ -1453,6 +1567,11 @@ touch@^3.1.0:
   dependencies:
     nopt "~1.0.10"
 
+type-fest@^0.11.0:
+  version "0.11.0"
+  resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.11.0.tgz#97abf0872310fed88a5c466b25681576145e33f1"
+  integrity sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==
+
 type@^1.0.1:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/type/-/type-1.2.0.tgz#848dd7698dafa3e54a6c479e759c4bc3f18847a0"
@@ -1569,6 +1688,15 @@ widest-line@^2.0.0:
   dependencies:
     string-width "^2.1.1"
 
+wrap-ansi@^6.2.0:
+  version "6.2.0"
+  resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-6.2.0.tgz#e9393ba07102e6c91a3b221478f0257cd2856e53"
+  integrity sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==
+  dependencies:
+    ansi-styles "^4.0.0"
+    string-width "^4.1.0"
+    strip-ansi "^6.0.0"
+
 write-file-atomic@^2.0.0:
   version "2.4.3"
   resolved "https://registry.yarnpkg.com/write-file-atomic/-/write-file-atomic-2.4.3.tgz#1fd2e9ae1df3e75b8d8c367443c692d4ca81f481"