diff --git a/.gitignore b/.gitignore
index 4cd00ab..4a4c1c6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -208,4 +208,3 @@ temp/
 doc/
 demo/_data/version.yml
 demo/release
-dist/
diff --git a/dist/persist-migrate.js b/dist/persist-migrate.js
new file mode 100644
index 0000000..3d68f74
--- /dev/null
+++ b/dist/persist-migrate.js
@@ -0,0 +1,103 @@
+/*
+Copyright (c) 2017 NAVER Corp.
+@egjs/persist project is licensed under the MIT license
+
+@egjs/persist JavaScript library
+
+
+@version 2.4.0
+*/
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	(global.eg = global.eg || {}, global.eg.Persist = factory());
+}(this, (function () { 'use strict';
+
+	var win = typeof window !== "undefined" && window || {};
+	var console = win.console;
+	var document = win.document;
+	var history = win.history;
+	var location = win.location;
+	var navigator = win.navigator;
+	var parseFloat = win.parseFloat;
+	var performance = win.performance;
+	var localStorage = null;
+	var sessionStorage = null;
+
+	try {
+	  localStorage = win.localStorage;
+	  sessionStorage = win.sessionStorage;
+	} catch (e) {}
+
+	var CONST_PERSIST = "___persist___";
+	var navigation = performance && performance.navigation;
+	var TYPE_NAVIGATE = navigation && navigation.TYPE_NAVIGATE || 0;
+	var TYPE_RELOAD = navigation && navigation.TYPE_RELOAD || 1;
+	var TYPE_BACK_FORWARD = navigation && navigation.TYPE_BACK_FORWARD || 2;
+
+	var userAgent = navigator ? navigator.userAgent : "";
+
+	var isNeeded = function () {
+	  var isIOS = new RegExp("iPhone|iPad", "i").test(userAgent);
+	  var isMacSafari = new RegExp("Mac", "i").test(userAgent) && !new RegExp("Chrome", "i").test(userAgent) && new RegExp("Apple", "i").test(userAgent);
+	  var isAndroid = new RegExp("Android ", "i").test(userAgent);
+	  var isWebview = new RegExp("wv; |inapp;", "i").test(userAgent);
+	  var androidVersion = isAndroid ? parseFloat(new RegExp("(Android)\\s([\\d_\\.]+|\\d_0)", "i").exec(userAgent)[2]) : undefined;
+	  return !(isIOS || isMacSafari || isAndroid && (androidVersion <= 4.3 && isWebview || androidVersion < 3));
+	}(); // In case of IE8, TYPE_BACK_FORWARD is undefined.
+
+	function getUrl() {
+	  return location ? location.href.split("#")[0] : "";
+	}
+
+	function getStorageKey(name) {
+	  return name + CONST_PERSIST;
+	}
+
+	/* eslint-disable */
+	var persistMigrate = (function (eg) {
+	  if (!eg || !eg.Persist) {
+	    return;
+	  }
+
+	  var GLOBAL_KEY = "KEY___persist___";
+	  var oldConstructor = eg.Persist.prototype;
+	  var isNeeded$$1 = eg.Persist.isNeeded;
+	  var StorageManager = eg.Persist.StorageManager;
+
+	  eg.Persist = function Persist(key, value) {
+	    var urlKey = getStorageKey(getUrl()); // when called as plain method
+
+	    if (!(this instanceof Persist)) {
+	      if (arguments.length === 0) {
+	        return StorageManager.getStateByKey(urlKey, GLOBAL_KEY);
+	      }
+
+	      if (arguments.length === 1 && typeof key !== "string") {
+	        var value_ = key;
+	        StorageManager.setStateByKey(urlKey, GLOBAL_KEY, value_);
+	        return undefined;
+	      }
+
+	      if (arguments.length === 2) {
+	        StorageManager.setStateByKey(urlKey, key, value);
+	      }
+
+	      return StorageManager.getStateByKey(urlKey, key);
+	    } // when called as constructer
+
+
+	    this.key = key;
+	    return undefined;
+	  };
+
+	  eg.Persist.isNeeded = isNeeded$$1;
+	  eg.Persist.prototype = oldConstructor;
+	  return eg.Persist;
+	})(win.eg);
+	/* eslint-enable */
+
+	return persistMigrate;
+
+})));
+//# sourceMappingURL=persist-migrate.js.map
diff --git a/dist/persist-migrate.js.map b/dist/persist-migrate.js.map
new file mode 100644
index 0000000..b5d2451
--- /dev/null
+++ b/dist/persist-migrate.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"persist-migrate.js","sources":["../src/browser.js","../src/consts.js","../src/utils.js","../src/persist-migrate.js"],"sourcesContent":["const win = (typeof window !== `undefined` && window) || {};\n\nexport {win as window};\nexport const console = win.console;\nexport const document = win.document;\nexport const history = win.history;\nexport const location = win.location;\nexport const navigator = win.navigator;\nexport const parseFloat = win.parseFloat;\nexport const performance = win.performance;\n\nlet localStorage = null;\n\nlet sessionStorage = null;\n\ntry {\n\tlocalStorage = win.localStorage;\n\tsessionStorage = win.sessionStorage;\n} catch (e) {\n}\n\nexport {\n\tlocalStorage,\n\tsessionStorage,\n};\n","import {performance} from \"./browser\";\n\nexport const CONST_PERSIST = \"___persist___\";\nexport const CONST_PERSIST_STATE = `state${CONST_PERSIST}`;\nexport const CONST_DEPTHS = \"depths\";\nexport const CONST_LAST_URL = \"lastUrl\";\nconst navigation = performance && performance.navigation;\n\nexport const TYPE_NAVIGATE = (navigation && navigation.TYPE_NAVIGATE) || 0;\nexport const TYPE_RELOAD = (navigation && navigation.TYPE_RELOAD) || 1;\nexport const TYPE_BACK_FORWARD = (navigation && navigation.TYPE_BACK_FORWARD) || 2;\n","import {navigator, parseFloat, performance, location} from \"./browser\";\nimport {CONST_PERSIST} from \"./consts\";\n\nconst userAgent = navigator ? navigator.userAgent : \"\";\n\nconst isNeeded = (function() {\n\tconst isIOS = (new RegExp(\"iPhone|iPad\", \"i\")).test(userAgent);\n\tconst isMacSafari = (new RegExp(\"Mac\", \"i\")).test(userAgent) &&\n\t\t!(new RegExp(\"Chrome\", \"i\")).test(userAgent) &&\n\t\t(new RegExp(\"Apple\", \"i\")).test(userAgent);\n\tconst isAndroid = (new RegExp(\"Android \", \"i\")).test(userAgent);\n\tconst isWebview = (new RegExp(\"wv; |inapp;\", \"i\")).test(userAgent);\n\tconst androidVersion = isAndroid ? parseFloat(new RegExp(\n\t\t\"(Android)\\\\s([\\\\d_\\\\.]+|\\\\d_0)\", \"i\"\n\t).exec(userAgent)[2]) : undefined;\n\n\treturn !(isIOS ||\n\t\t\tisMacSafari ||\n\t\t\t(isAndroid &&\n\t\t\t\t((androidVersion <= 4.3 && isWebview) || androidVersion < 3)));\n})();\n\n// In case of IE8, TYPE_BACK_FORWARD is undefined.\nfunction getNavigationType() {\n\treturn performance && performance.navigation &&\n\t\tperformance.navigation.type;\n}\nfunction getUrl() {\n\treturn location ? location.href.split(\"#\")[0] : \"\";\n}\nfunction getStorageKey(name) {\n\treturn name + CONST_PERSIST;\n}\n\nexport {\n\tgetUrl,\n\tgetStorageKey,\n\tgetNavigationType,\n\tisNeeded,\n};\n","/* eslint-disable */\nimport {window} from \"./browser\";\nimport { getStorageKey, getUrl } from \"./utils\";\n\nexport default (function(eg) {\n\tif (!eg || !eg.Persist) {\n\t\treturn;\n\t}\n\n\tvar GLOBAL_KEY = \"KEY___persist___\";\n\tvar oldConstructor = eg.Persist.prototype;\n\tvar isNeeded = eg.Persist.isNeeded;\n\tvar StorageManager = eg.Persist.StorageManager;\n\n\teg.Persist = function Persist(key, value) {\n\t\tconst urlKey = getStorageKey(getUrl());\n\t\t// when called as plain method\n\t\tif (!(this instanceof Persist)) {\n\t\t\tif (arguments.length === 0) {\n\t\t\t\treturn StorageManager.getStateByKey(urlKey, GLOBAL_KEY);\n\t\t\t}\n\n\t\t\tif (arguments.length === 1 && typeof key !== \"string\") {\n\t\t\t\tvar value_ = key;\n\n\t\t\t\tStorageManager.setStateByKey(urlKey, GLOBAL_KEY, value_);\n\t\t\t\treturn undefined;\n\t\t\t}\n\n\t\t\tif (arguments.length === 2) {\n\t\t\t\tStorageManager.setStateByKey(urlKey, key, value);\n\t\t\t}\n\n\t\t\treturn StorageManager.getStateByKey(urlKey, key);\n\t\t}\n\n\t\t// when called as constructer\n\t\tthis.key = key;\n\t\treturn undefined;\n\t};\n\teg.Persist.isNeeded = isNeeded;\n\teg.Persist.prototype = oldConstructor;\n\treturn eg.Persist;\n})(window.eg);\n\n/* eslint-enable 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diff --git a/dist/persist-migrate.min.js b/dist/persist-migrate.min.js
new file mode 100644
index 0000000..65ca314
--- /dev/null
+++ b/dist/persist-migrate.min.js
@@ -0,0 +1,2 @@
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e.eg=e.eg||{},e.eg.Persist=t())}(this,function(){"use strict";var e="undefined"!=typeof window&&window||{},a=(e.console,e.document,e.history,e.location),t=e.navigator,i=e.parseFloat,s=e.performance;try{e.localStorage,e.sessionStorage}catch(e){}var n,r,o,p,d,g=s&&s.navigation,f=(g&&g.TYPE_NAVIGATE,g&&g.TYPE_RELOAD,g&&g.TYPE_BACK_FORWARD,t?t.userAgent:"");n=new RegExp("iPhone|iPad","i").test(f),r=new RegExp("Mac","i").test(f)&&!new RegExp("Chrome","i").test(f)&&new RegExp("Apple","i").test(f),o=new RegExp("Android ","i").test(f),p=new RegExp("wv; |inapp;","i").test(f),d=o?i(new RegExp("(Android)\\s([\\d_\\.]+|\\d_0)","i").exec(f)[2]):void 0;return function(e){if(e&&e.Persist){var r="KEY___persist___",t=e.Persist.prototype,i=e.Persist.isNeeded,o=e.Persist.StorageManager;return e.Persist=function e(t,i){var s=(a?a.href.split("#")[0]:"")+"___persist___";if(this instanceof e)this.key=t;else{if(0===arguments.length)return o.getStateByKey(s,r);if(1!==arguments.length||"string"==typeof t)return 2===arguments.length&&o.setStateByKey(s,t,i),o.getStateByKey(s,t);var n=t;o.setStateByKey(s,r,n)}},e.Persist.isNeeded=i,e.Persist.prototype=t,e.Persist}}(e.eg)});
+//# sourceMappingURL=persist-migrate.min.js.map
diff --git a/dist/persist-migrate.min.js.map b/dist/persist-migrate.min.js.map
new file mode 100644
index 0000000..12b5f07
--- /dev/null
+++ b/dist/persist-migrate.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"persist-migrate.min.js","sources":["../src/browser.js","../src/consts.js","../src/utils.js","../src/persist-migrate.js"],"sourcesContent":["const win = (typeof window !== `undefined` && window) || {};\n\nexport {win as window};\nexport const console = win.console;\nexport const document = win.document;\nexport const history = win.history;\nexport const location = win.location;\nexport const navigator = win.navigator;\nexport const parseFloat = win.parseFloat;\nexport const performance = win.performance;\n\nlet localStorage = null;\n\nlet sessionStorage = null;\n\ntry {\n\tlocalStorage = win.localStorage;\n\tsessionStorage = win.sessionStorage;\n} catch (e) {\n}\n\nexport {\n\tlocalStorage,\n\tsessionStorage,\n};\n","import {performance} from \"./browser\";\n\nexport const CONST_PERSIST = \"___persist___\";\nexport const CONST_PERSIST_STATE = `state${CONST_PERSIST}`;\nexport const CONST_DEPTHS = \"depths\";\nexport const CONST_LAST_URL = \"lastUrl\";\nconst navigation = performance && performance.navigation;\n\nexport const TYPE_NAVIGATE = (navigation && navigation.TYPE_NAVIGATE) || 0;\nexport const TYPE_RELOAD = (navigation && navigation.TYPE_RELOAD) || 1;\nexport const TYPE_BACK_FORWARD = (navigation && navigation.TYPE_BACK_FORWARD) || 2;\n","import {navigator, parseFloat, performance, location} from \"./browser\";\nimport {CONST_PERSIST} from \"./consts\";\n\nconst userAgent = navigator ? navigator.userAgent : \"\";\n\nconst isNeeded = (function() {\n\tconst isIOS = (new RegExp(\"iPhone|iPad\", \"i\")).test(userAgent);\n\tconst isMacSafari = (new RegExp(\"Mac\", \"i\")).test(userAgent) &&\n\t\t!(new RegExp(\"Chrome\", \"i\")).test(userAgent) &&\n\t\t(new RegExp(\"Apple\", \"i\")).test(userAgent);\n\tconst isAndroid = (new RegExp(\"Android \", \"i\")).test(userAgent);\n\tconst isWebview = (new RegExp(\"wv; |inapp;\", \"i\")).test(userAgent);\n\tconst androidVersion = isAndroid ? parseFloat(new RegExp(\n\t\t\"(Android)\\\\s([\\\\d_\\\\.]+|\\\\d_0)\", \"i\"\n\t).exec(userAgent)[2]) : undefined;\n\n\treturn !(isIOS ||\n\t\t\tisMacSafari ||\n\t\t\t(isAndroid &&\n\t\t\t\t((androidVersion <= 4.3 && isWebview) || androidVersion < 3)));\n})();\n\n// In case of IE8, TYPE_BACK_FORWARD is undefined.\nfunction getNavigationType() {\n\treturn performance && performance.navigation &&\n\t\tperformance.navigation.type;\n}\nfunction getUrl() {\n\treturn location ? location.href.split(\"#\")[0] : \"\";\n}\nfunction getStorageKey(name) {\n\treturn name + CONST_PERSIST;\n}\n\nexport {\n\tgetUrl,\n\tgetStorageKey,\n\tgetNavigationType,\n\tisNeeded,\n};\n","/* eslint-disable */\nimport {window} from \"./browser\";\nimport { getStorageKey, getUrl } from \"./utils\";\n\nexport default (function(eg) {\n\tif (!eg || !eg.Persist) {\n\t\treturn;\n\t}\n\n\tvar GLOBAL_KEY = \"KEY___persist___\";\n\tvar oldConstructor = eg.Persist.prototype;\n\tvar isNeeded = eg.Persist.isNeeded;\n\tvar StorageManager = eg.Persist.StorageManager;\n\n\teg.Persist = function Persist(key, value) {\n\t\tconst urlKey = getStorageKey(getUrl());\n\t\t// when called as plain method\n\t\tif (!(this instanceof Persist)) {\n\t\t\tif (arguments.length === 0) {\n\t\t\t\treturn StorageManager.getStateByKey(urlKey, GLOBAL_KEY);\n\t\t\t}\n\n\t\t\tif (arguments.length === 1 && typeof key !== \"string\") {\n\t\t\t\tvar value_ = key;\n\n\t\t\t\tStorageManager.setStateByKey(urlKey, GLOBAL_KEY, value_);\n\t\t\t\treturn undefined;\n\t\t\t}\n\n\t\t\tif (arguments.length === 2) {\n\t\t\t\tStorageManager.setStateByKey(urlKey, key, value);\n\t\t\t}\n\n\t\t\treturn StorageManager.getStateByKey(urlKey, key);\n\t\t}\n\n\t\t// when called as constructer\n\t\tthis.key = key;\n\t\treturn undefined;\n\t};\n\teg.Persist.isNeeded = isNeeded;\n\teg.Persist.prototype = oldConstructor;\n\treturn eg.Persist;\n})(window.eg);\n\n/* eslint-enable */\n"],"names":["win","window","location","console","document","history","navigator","parseFloat","performance","localStorage","sessionStorage","e","isIOS","isMacSafari","isAndroid","isWebview","androidVersion","navigation","userAgent","TYPE_NAVIGATE","TYPE_RELOAD","TYPE_BACK_FORWARD","RegExp","test","exec","undefined","eg","Persist","GLOBAL_KEY","oldConstructor","prototype","isNeeded","StorageManager","key","value","urlKey","href","split","this","arguments","length","getStateByKey","setStateByKey","value_"],"mappings":"sMAAA,IAAMA,sBAAcC,QAA0BA,QAAW,GAM5CC,GAHUF,EAAIG,QACHH,EAAII,SACLJ,EAAIK,QACHL,EAAIE,UACfI,EAAYN,EAAIM,UAChBC,EAAaP,EAAIO,WACjBC,EAAcR,EAAIQ,YAM/B,IACgBR,EAAIS,aACFT,EAAIU,eACpB,MAAOC,IChBF,ICIAC,EACAC,EAGAC,EACAC,EACAC,EDNDC,EAAaT,GAAeA,EAAYS,WCHxCC,GDKwBD,GAAcA,EAAWE,cAC3BF,GAAcA,EAAWG,YACnBH,GAAcA,EAAWI,kBCPzCf,EAAYA,EAAUY,UAAY,IAG7CN,EAAS,IAAIU,OAAO,cAAe,KAAMC,KAAKL,GAC9CL,EAAe,IAAIS,OAAO,MAAO,KAAMC,KAAKL,KAC/C,IAAII,OAAO,SAAU,KAAMC,KAAKL,IACjC,IAAII,OAAO,QAAS,KAAMC,KAAKL,GAC3BJ,EAAa,IAAIQ,OAAO,WAAY,KAAMC,KAAKL,GAC/CH,EAAa,IAAIO,OAAO,cAAe,KAAMC,KAAKL,GAClDF,EAAiBF,EAAYP,EAAW,IAAIe,OACjD,iCAAkC,KACjCE,KAAKN,GAAW,SAAMO,SCVV,SAAUC,MACnBA,GAAOA,EAAGC,aAIXC,EAAa,mBACbC,EAAiBH,EAAGC,QAAQG,UAC5BC,EAAWL,EAAGC,QAAQI,SACtBC,EAAiBN,EAAGC,QAAQK,sBAEhCN,EAAGC,QAAU,SAASA,EAAQM,EAAKC,OAC5BC,GDaAjC,EAAWA,EAASkC,KAAKC,MAAM,KAAK,GAAK,ID1BpB,mBEerBC,gBAAgBX,OAoBjBM,IAAMA,UAnBe,IAArBM,UAAUC,cACNR,EAAeS,cAAcN,EAAQP,MAGpB,IAArBW,UAAUC,QAA+B,iBAARP,SAOZ,IAArBM,UAAUC,QACbR,EAAeU,cAAcP,EAAQF,EAAKC,GAGpCF,EAAeS,cAAcN,EAAQF,OAVvCU,EAASV,EAEbD,EAAeU,cAAcP,EAAQP,EAAYe,KAepDjB,EAAGC,QAAQI,SAAWA,EACtBL,EAAGC,QAAQG,UAAYD,EAChBH,EAAGC,SAtCI,CAuCZ1B,EAAOyB"}
\ No newline at end of file
diff --git a/dist/persist.esm.js b/dist/persist.esm.js
new file mode 100644
index 0000000..ff433b7
--- /dev/null
+++ b/dist/persist.esm.js
@@ -0,0 +1,517 @@
+/*
+Copyright (c) 2017 NAVER Corp.
+@egjs/persist project is licensed under the MIT license
+
+@egjs/persist JavaScript library
+
+
+@version 2.4.0
+*/
+var win = typeof window !== "undefined" && window || {};
+var console$1 = win.console;
+var document$1 = win.document;
+var history = win.history;
+var location = win.location;
+var navigator = win.navigator;
+var parseFloat = win.parseFloat;
+var performance = win.performance;
+var localStorage = null;
+var sessionStorage = null;
+
+try {
+  localStorage = win.localStorage;
+  sessionStorage = win.sessionStorage;
+} catch (e) {}
+
+var CONST_PERSIST = "___persist___";
+var CONST_PERSIST_STATE = "state" + CONST_PERSIST;
+var CONST_DEPTHS = "depths";
+var CONST_LAST_URL = "lastUrl";
+var navigation = performance && performance.navigation;
+var TYPE_NAVIGATE = navigation && navigation.TYPE_NAVIGATE || 0;
+var TYPE_RELOAD = navigation && navigation.TYPE_RELOAD || 1;
+var TYPE_BACK_FORWARD = navigation && navigation.TYPE_BACK_FORWARD || 2;
+
+var isSupportState = history && "replaceState" in history && "state" in history;
+
+function isStorageAvailable(storage) {
+  if (!storage) {
+    return undefined;
+  }
+
+  var TMP_KEY = "__tmp__" + CONST_PERSIST;
+
+  try {
+    // In case of iOS safari private mode, calling setItem on storage throws error
+    storage.setItem(TMP_KEY, CONST_PERSIST); // In Chrome incognito mode, can not get saved value
+    // In IE8, calling storage.getItem occasionally makes "Permission denied" error
+
+    return storage.getItem(TMP_KEY) === CONST_PERSIST;
+  } catch (e) {
+    return false;
+  }
+}
+
+var storage = function () {
+  var strg;
+
+  if (isStorageAvailable(sessionStorage)) {
+    strg = sessionStorage;
+  } else if (isStorageAvailable(localStorage)) {
+    strg = localStorage;
+  }
+
+  return strg;
+}();
+
+function warnInvalidStorageValue() {
+  /* eslint-disable no-console */
+  console.warn("window.history or session/localStorage has no valid " + "format data to be handled in persist.");
+  /* eslint-enable no-console */
+}
+
+function getStorage() {
+  return storage;
+}
+/*
+ * Get state value
+ */
+
+
+function getState(key) {
+  var state;
+  var stateStr;
+
+  if (storage) {
+    stateStr = storage.getItem(key);
+  } else if (history.state) {
+    if (typeof history.state === "object" && history.state !== null) {
+      stateStr = history.state[key];
+    } else {
+      warnInvalidStorageValue();
+    }
+  } else {
+    stateStr = history.state;
+  } // the storage is clean
+
+
+  if (stateStr === null) {
+    return {};
+  } // "null" is not a valid
+
+
+  var isValidStateStr = typeof stateStr === "string" && stateStr.length > 0 && stateStr !== "null";
+
+  try {
+    state = JSON.parse(stateStr); // like '[ ... ]', '1', '1.234', '"123"' is also not valid
+
+    var isValidType = !(typeof state !== "object" || state instanceof Array);
+
+    if (!isValidStateStr || !isValidType) {
+      throw new Error();
+    }
+  } catch (e) {
+    warnInvalidStorageValue();
+    state = {};
+  } // Note2 (Android 4.3) return value is null
+
+
+  return state;
+}
+
+function getStateByKey(key, valueKey) {
+  if (!isSupportState && !storage) {
+    return undefined;
+  }
+
+  var result = getState(key)[valueKey]; // some device returns "null" or undefined
+
+  if (result === "null" || typeof result === "undefined") {
+    result = null;
+  }
+
+  return result;
+}
+/*
+ * Set state value
+ */
+
+
+function setState(key, state) {
+  if (storage) {
+    if (state) {
+      storage.setItem(key, JSON.stringify(state));
+    } else {
+      storage.removeItem(key);
+    }
+  } else {
+    try {
+      var historyState = !history || history.state == null ? {} : history.state;
+
+      if (history && typeof historyState === "object") {
+        historyState[key] = JSON.stringify(state);
+        history.replaceState(historyState, document.title, location.href);
+      } else {
+        /* eslint-disable no-console */
+        console.warn("To use a history object, it must be an object that is not a primitive type.");
+        /* eslint-enable no-console */
+      }
+    } catch (e) {
+      /* eslint-disable no-console */
+      console.warn(e.message);
+      /* eslint-enable no-console */
+    }
+  }
+
+  state ? win[CONST_PERSIST] = true : delete win[CONST_PERSIST];
+}
+
+function setStateByKey(key, valueKey, data) {
+  if (!isSupportState && !storage) {
+    return;
+  }
+
+  var beforeData = getState(key);
+  beforeData[valueKey] = data;
+  setState(key, beforeData);
+}
+/*
+ * flush current history state
+ */
+
+
+function reset(key) {
+  setState(key, null);
+}
+
+var userAgent = navigator ? navigator.userAgent : "";
+
+var isNeeded = function () {
+  var isIOS = new RegExp("iPhone|iPad", "i").test(userAgent);
+  var isMacSafari = new RegExp("Mac", "i").test(userAgent) && !new RegExp("Chrome", "i").test(userAgent) && new RegExp("Apple", "i").test(userAgent);
+  var isAndroid = new RegExp("Android ", "i").test(userAgent);
+  var isWebview = new RegExp("wv; |inapp;", "i").test(userAgent);
+  var androidVersion = isAndroid ? parseFloat(new RegExp("(Android)\\s([\\d_\\.]+|\\d_0)", "i").exec(userAgent)[2]) : undefined;
+  return !(isIOS || isMacSafari || isAndroid && (androidVersion <= 4.3 && isWebview || androidVersion < 3));
+}(); // In case of IE8, TYPE_BACK_FORWARD is undefined.
+
+
+function getNavigationType() {
+  return performance && performance.navigation && performance.navigation.type;
+}
+
+function getUrl() {
+  return location ? location.href.split("#")[0] : "";
+}
+
+function getStorageKey(name) {
+  return name + CONST_PERSIST;
+}
+
+/* eslint-disable no-use-before-define */
+var currentUrl = "";
+
+function execRec(obj, path, func) {
+  var _obj = obj;
+
+  if (!_obj) {
+    _obj = isNaN(path[0]) ? {} : [];
+  }
+
+  var head = path.shift();
+
+  if (path.length === 0) {
+    if (_obj instanceof Array && isNaN(head)) {
+      console$1.warn("Don't use key string on array");
+    }
+
+    func(_obj, head);
+    return _obj;
+  }
+
+  _obj[head] = execRec(_obj[head], path, func);
+  return _obj;
+}
+
+function setPersistState(key, value) {
+  try {
+    setStateByKey(CONST_PERSIST_STATE, key, value);
+  } catch (e) {
+    if (clearFirst()) {
+      if (key === CONST_LAST_URL) {
+        setPersistState(key, value);
+      } else if (key === CONST_DEPTHS) {
+        setPersistState(key, value && value.slice(1));
+      }
+    } else {
+      // There is no more size to fit in.
+      throw e;
+    }
+  }
+}
+
+function getPersistState(key) {
+  return getStateByKey(CONST_PERSIST_STATE, key);
+}
+
+function updateDepth(type) {
+  if (type === void 0) {
+    type = 0;
+  }
+
+  var url = getUrl();
+
+  if (currentUrl === url) {
+    return;
+  } // url is not the same for the first time, pushState, or replaceState.
+
+
+  currentUrl = url;
+  var depths = getPersistState(CONST_DEPTHS) || [];
+
+  if (type === TYPE_BACK_FORWARD) {
+    // Change current url only
+    var currentIndex = depths.indexOf(currentUrl);
+    ~currentIndex && setPersistState(CONST_LAST_URL, currentUrl);
+  } else {
+    var prevLastUrl = getPersistState(CONST_LAST_URL);
+    reset(getStorageKey(currentUrl));
+
+    if (type === TYPE_NAVIGATE && url !== prevLastUrl) {
+      // Remove all url lists with higher index than current index
+      var prevLastIndex = depths.indexOf(prevLastUrl);
+      var removedList = depths.splice(prevLastIndex + 1, depths.length);
+      removedList.forEach(function (removedUrl) {
+        reset(getStorageKey(removedUrl));
+      }); // If the type is NAVIGATE and there is information about current url, delete it.
+
+      var _currentIndex = depths.indexOf(currentUrl);
+
+      ~_currentIndex && depths.splice(_currentIndex, 1);
+    } // Add depth for new address.
+
+
+    if (depths.indexOf(url) < 0) {
+      depths.push(url);
+    }
+
+    setPersistState(CONST_DEPTHS, depths);
+    setPersistState(CONST_LAST_URL, url);
+  }
+}
+
+function clearFirst() {
+  var depths = getPersistState(CONST_DEPTHS) || [];
+  var removed = depths.splice(0, 1);
+
+  if (!removed.length) {
+    // There is an error because there is no depth to add data.
+    return false;
+  }
+
+  var removedUrl = removed[0];
+  reset(getStorageKey(removedUrl));
+
+  if (currentUrl === removedUrl) {
+    currentUrl = "";
+    setPersistState(CONST_LAST_URL, "");
+
+    if (!depths.length) {
+      // I tried to add myself, but it didn't add up, so I got an error.
+      return false;
+    }
+  }
+
+  setPersistState(CONST_DEPTHS, depths); // Clear the previous record and try to add data again.
+
+  return true;
+}
+
+function _clear() {
+  var depths = getPersistState(CONST_DEPTHS) || [];
+  depths.forEach(function (url) {
+    reset(getStorageKey(url));
+  });
+  reset(CONST_PERSIST_STATE);
+  currentUrl = "";
+}
+
+if ("onpopstate" in win) {
+  win.addEventListener("popstate", function () {
+    // popstate event occurs when backward or forward
+    updateDepth(TYPE_BACK_FORWARD);
+  });
+}
+/**
+ * Get or store the current state of the web page using JSON.
+ * @ko 웹 페이지의 현재 상태를 JSON 형식으로 저장하거나 읽는다.
+ * @alias eg.Persist
+ *
+ * @support {"ie": "9+", "ch" : "latest", "ff" : "latest",  "sf" : "latest" , "edge" : "latest", "ios" : "7+", "an" : "2.3+ (except 3.x)"}
+ */
+
+
+var Persist =
+/*#__PURE__*/
+function () {
+  var Persist =
+  /*#__PURE__*/
+  function () {
+    /**
+     * @static
+     * Clear all information in Persist
+     */
+    Persist.clear = function clear() {
+      _clear();
+    };
+    /**
+     * @static
+     * Return whether you need "Persist" module by checking the bfCache support of the current browser
+     * @return {Boolean}
+     */
+
+
+    Persist.isNeeded = function isNeeded$$1() {
+      return isNeeded;
+    };
+    /**
+    * Constructor
+    * @param {String} key The key of the state information to be stored <ko>저장할 상태 정보의 키</ko>
+    **/
+
+
+    function Persist(key) {
+      this.key = key || "";
+    }
+    /**
+     * Read value
+     * @param {String?} path target path
+     * @return {String|Number|Boolean|Object|Array}
+     */
+
+
+    var _proto = Persist.prototype;
+
+    _proto.get = function get(path) {
+      // update url for pushState, replaceState
+      updateDepth(TYPE_NAVIGATE); // find path
+
+      var urlKey = getStorageKey(getUrl());
+      var globalState = getStateByKey(urlKey, this.key);
+
+      if (!path || path.length === 0) {
+        return globalState;
+      }
+
+      var pathToken = path.split(".");
+      var currentItem = globalState;
+      var isTargetExist = true;
+
+      for (var i = 0; i < pathToken.length; i++) {
+        if (!currentItem) {
+          isTargetExist = false;
+          break;
+        }
+
+        currentItem = currentItem[pathToken[i]];
+      }
+
+      if (!isTargetExist || currentItem == null) {
+        return null;
+      }
+
+      return currentItem;
+    };
+    /**
+     * Save value
+     * @param {String} path target path
+     * @param {String|Number|Boolean|Object|Array} value value to save
+     * @return {Persist}
+     */
+
+
+    _proto.set = function set(path, value) {
+      // update url for pushState, replaceState
+      updateDepth(TYPE_NAVIGATE); // find path
+
+      var key = this.key;
+      var urlKey = getStorageKey(getUrl());
+      var globalState = getStateByKey(urlKey, key);
+
+      try {
+        if (path.length === 0) {
+          setStateByKey(urlKey, key, value);
+        } else {
+          var allValue = execRec(globalState, path.split("."), function (obj, head) {
+            obj[head] = value;
+          });
+          setStateByKey(urlKey, key, allValue);
+        }
+      } catch (e) {
+        if (clearFirst(e)) {
+          this.set(path, value);
+        } else {
+          // There is no more size to fit in.
+          throw e;
+        }
+      }
+
+      return this;
+    };
+    /**
+     * Remove value
+     * @param {String} path target path
+     * @return {Persist}
+     */
+
+
+    _proto.remove = function remove(path) {
+      // update url for pushState, replaceState
+      updateDepth(TYPE_NAVIGATE); // find path
+
+      var key = this.key;
+      var urlKey = getStorageKey(getUrl());
+      var globalState = getStateByKey(urlKey, key);
+
+      try {
+        if (path.length === 0) {
+          setStateByKey(urlKey, key, null);
+        } else {
+          var value = execRec(globalState, path.split("."), function (obj, head) {
+            if (typeof obj === "object") {
+              delete obj[head];
+            }
+          });
+          setStateByKey(urlKey, key, value);
+        }
+      } catch (e) {
+        if (clearFirst(e)) {
+          this.remove(path);
+        } else {
+          // There is no more size to fit in.
+          throw e;
+        }
+      }
+
+      return this;
+    };
+
+    return Persist;
+  }();
+
+  Persist.VERSION = "2.4.0";
+  Persist.StorageManager = {
+    reset: reset,
+    setStateByKey: setStateByKey,
+    getStateByKey: getStateByKey,
+    getStorage: getStorage
+  };
+  return Persist;
+}(); // If navigation's type is not TYPE_BACK_FORWARD, delete information about current url.
+
+
+updateDepth(getNavigationType());
+
+export default Persist;
+export { updateDepth };
+//# sourceMappingURL=persist.esm.js.map
diff --git a/dist/persist.esm.js.map b/dist/persist.esm.js.map
new file mode 100644
index 0000000..f1dff0e
--- /dev/null
+++ b/dist/persist.esm.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"persist.esm.js","sources":["../src/browser.js","../src/consts.js","../src/storageManager.js","../src/utils.js","../src/Persist.js"],"sourcesContent":["const win = (typeof window !== `undefined` && window) || {};\n\nexport {win as window};\nexport const console = win.console;\nexport const document = win.document;\nexport const history = win.history;\nexport const location = win.location;\nexport const navigator = win.navigator;\nexport const parseFloat = win.parseFloat;\nexport const performance = win.performance;\n\nlet localStorage = null;\n\nlet sessionStorage = null;\n\ntry {\n\tlocalStorage = win.localStorage;\n\tsessionStorage = win.sessionStorage;\n} catch (e) {\n}\n\nexport {\n\tlocalStorage,\n\tsessionStorage,\n};\n","import {performance} from \"./browser\";\n\nexport const CONST_PERSIST = \"___persist___\";\nexport const CONST_PERSIST_STATE = `state${CONST_PERSIST}`;\nexport const CONST_DEPTHS = \"depths\";\nexport const CONST_LAST_URL = \"lastUrl\";\nconst navigation = performance && performance.navigation;\n\nexport const TYPE_NAVIGATE = (navigation && navigation.TYPE_NAVIGATE) || 0;\nexport const TYPE_RELOAD = (navigation && navigation.TYPE_RELOAD) || 1;\nexport const TYPE_BACK_FORWARD = (navigation && navigation.TYPE_BACK_FORWARD) || 2;\n","import {window, history, location, sessionStorage, localStorage} from \"./browser\";\nimport {CONST_PERSIST} from \"./consts\";\n\nconst isSupportState = history && \"replaceState\" in history && \"state\" in history;\n\nfunction isStorageAvailable(storage) {\n\tif (!storage) {\n\t\treturn undefined;\n\t}\n\tconst TMP_KEY = `__tmp__${CONST_PERSIST}`;\n\n\ttry {\n\t\t// In case of iOS safari private mode, calling setItem on storage throws error\n\t\tstorage.setItem(TMP_KEY, CONST_PERSIST);\n\n\t\t// In Chrome incognito mode, can not get saved value\n\t\t// In IE8, calling storage.getItem occasionally makes \"Permission denied\" error\n\t\treturn storage.getItem(TMP_KEY) === CONST_PERSIST;\n\t} catch (e) {\n\t\treturn false;\n\t}\n}\n\nconst storage = (function() {\n\tlet strg;\n\n\tif (isStorageAvailable(sessionStorage)) {\n\t\tstrg = sessionStorage;\n\t} else if (isStorageAvailable(localStorage)) {\n\t\tstrg = localStorage;\n\t}\n\n\treturn strg;\n})();\n\nfunction warnInvalidStorageValue() {\n\t/* eslint-disable no-console */\n\tconsole.warn(\"window.history or session/localStorage has no valid \" +\n\t\t\t\"format data to be handled in persist.\");\n\t/* eslint-enable no-console */\n}\n\nfunction getStorage() {\n\treturn storage;\n}\n\n/*\n * Get state value\n */\nfunction getState(key) {\n\tlet state;\n\n\tlet stateStr;\n\n\tif (storage) {\n\t\tstateStr = storage.getItem(key);\n\t} else if (history.state) {\n\t\tif (typeof history.state === \"object\" && history.state !== null) {\n\t\t\tstateStr = history.state[key];\n\t\t} else {\n\t\t\twarnInvalidStorageValue();\n\t\t}\n\t} else {\n\t\tstateStr = history.state;\n\t}\n\n\t// the storage is clean\n\tif (stateStr === null) {\n\t\treturn {};\n\t}\n\n\t// \"null\" is not a valid\n\tconst isValidStateStr = typeof stateStr === \"string\" &&\n\t\t\t\t\t\t\t\tstateStr.length > 0 && stateStr !== \"null\";\n\n\ttry {\n\t\tstate = JSON.parse(stateStr);\n\n\t\t// like '[ ... ]', '1', '1.234', '\"123\"' is also not valid\n\t\tconst isValidType = !(typeof state !== \"object\" || state instanceof Array);\n\n\t\tif (!isValidStateStr || !isValidType) {\n\t\t\tthrow new Error();\n\t\t}\n\t} catch (e) {\n\t\twarnInvalidStorageValue();\n\t\tstate = {};\n\t}\n\n\t// Note2 (Android 4.3) return value is null\n\treturn state;\n}\n\nfunction getStateByKey(key, valueKey) {\n\tif (!isSupportState && !storage) {\n\t\treturn undefined;\n\t}\n\n\tlet result = getState(key)[valueKey];\n\n\t// some device returns \"null\" or undefined\n\tif (result === \"null\" || typeof result === \"undefined\") {\n\t\tresult = null;\n\t}\n\treturn result;\n}\n\n/*\n * Set state value\n */\nfunction setState(key, state) {\n\tif (storage) {\n\t\tif (state) {\n\t\t\tstorage.setItem(\n\t\t\t\tkey, JSON.stringify(state));\n\t\t} else {\n\t\t\tstorage.removeItem(key);\n\t\t}\n\t} else {\n\t\ttry {\n\t\t\tconst historyState = !history || history.state == null ? {} : history.state;\n\n\t\t\tif (history && typeof historyState === \"object\") {\n\t\t\t\thistoryState[key] = JSON.stringify(state);\n\t\t\t\thistory.replaceState(\n\t\t\t\t\thistoryState,\n\t\t\t\t\tdocument.title,\n\t\t\t\t\tlocation.href\n\t\t\t\t);\n\t\t\t} else {\n\t\t\t\t/* eslint-disable no-console */\n\t\t\t\tconsole.warn(\"To use a history object, it must be an object that is not a primitive type.\");\n\t\t\t\t/* eslint-enable no-console */\n\t\t\t}\n\t\t} catch (e) {\n\t\t\t/* eslint-disable no-console */\n\t\t\tconsole.warn(e.message);\n\t\t\t/* eslint-enable no-console */\n\t\t}\n\t}\n\n\tstate ? window[CONST_PERSIST] = true : delete window[CONST_PERSIST];\n}\n\nfunction setStateByKey(key, valueKey, data) {\n\tif (!isSupportState && !storage) {\n\t\treturn;\n\t}\n\n\tconst beforeData = getState(key);\n\n\tbeforeData[valueKey] = data;\n\tsetState(key, beforeData);\n}\n\n/*\n * flush current history state\n */\nfunction reset(key) {\n\tsetState(key, null);\n}\n\nexport {\n\treset,\n\tsetStateByKey,\n\tgetStateByKey,\n\tgetStorage,\n};\n","import {navigator, parseFloat, performance, location} from \"./browser\";\nimport {CONST_PERSIST} from \"./consts\";\n\nconst userAgent = navigator ? navigator.userAgent : \"\";\n\nconst isNeeded = (function() {\n\tconst isIOS = (new RegExp(\"iPhone|iPad\", \"i\")).test(userAgent);\n\tconst isMacSafari = (new RegExp(\"Mac\", \"i\")).test(userAgent) &&\n\t\t!(new RegExp(\"Chrome\", \"i\")).test(userAgent) &&\n\t\t(new RegExp(\"Apple\", \"i\")).test(userAgent);\n\tconst isAndroid = (new RegExp(\"Android \", \"i\")).test(userAgent);\n\tconst isWebview = (new RegExp(\"wv; |inapp;\", \"i\")).test(userAgent);\n\tconst androidVersion = isAndroid ? parseFloat(new RegExp(\n\t\t\"(Android)\\\\s([\\\\d_\\\\.]+|\\\\d_0)\", \"i\"\n\t).exec(userAgent)[2]) : undefined;\n\n\treturn !(isIOS ||\n\t\t\tisMacSafari ||\n\t\t\t(isAndroid &&\n\t\t\t\t((androidVersion <= 4.3 && isWebview) || androidVersion < 3)));\n})();\n\n// In case of IE8, TYPE_BACK_FORWARD is undefined.\nfunction getNavigationType() {\n\treturn performance && performance.navigation &&\n\t\tperformance.navigation.type;\n}\nfunction getUrl() {\n\treturn location ? location.href.split(\"#\")[0] : \"\";\n}\nfunction getStorageKey(name) {\n\treturn name + CONST_PERSIST;\n}\n\nexport {\n\tgetUrl,\n\tgetStorageKey,\n\tgetNavigationType,\n\tisNeeded,\n};\n","/* eslint-disable no-use-before-define */\nimport {\n\treset,\n\tsetStateByKey,\n\tgetStateByKey,\n\tgetStorage,\n} from \"./storageManager\";\nimport {isNeeded, getUrl, getStorageKey, getNavigationType} from \"./utils\";\nimport {console, window} from \"./browser\";\nimport {TYPE_BACK_FORWARD, TYPE_NAVIGATE, CONST_PERSIST_STATE, CONST_DEPTHS, CONST_LAST_URL} from \"./consts\";\n\nlet currentUrl = \"\";\n\n\nfunction execRec(obj, path, func) {\n\tlet _obj = obj;\n\n\tif (!_obj) {\n\t\t_obj = isNaN(path[0]) ? {} : [];\n\t}\n\n\tconst head = path.shift();\n\n\tif (path.length === 0) {\n\t\tif (_obj instanceof Array && isNaN(head)) {\n\t\t\tconsole.warn(\"Don't use key string on array\");\n\t\t}\n\t\tfunc(_obj, head);\n\t\treturn _obj;\n\t}\n\n\t_obj[head] = execRec(_obj[head], path, func);\n\treturn _obj;\n}\n\nfunction setPersistState(key, value) {\n\ttry {\n\t\tsetStateByKey(CONST_PERSIST_STATE, key, value);\n\t} catch (e) {\n\t\tif (clearFirst()) {\n\t\t\tif (key === CONST_LAST_URL) {\n\t\t\t\tsetPersistState(key, value);\n\t\t\t} else if (key === CONST_DEPTHS) {\n\t\t\t\tsetPersistState(key, value && value.slice(1));\n\t\t\t}\n\t\t} else {\n\t\t\t// There is no more size to fit in.\n\t\t\tthrow e;\n\t\t}\n\t}\n}\nfunction getPersistState(key) {\n\treturn getStateByKey(CONST_PERSIST_STATE, key);\n}\nfunction updateDepth(type = 0) {\n\tconst url = getUrl();\n\n\tif (currentUrl === url) {\n\t\treturn;\n\t}\n\t// url is not the same for the first time, pushState, or replaceState.\n\tcurrentUrl = url;\n\tconst depths = getPersistState(CONST_DEPTHS) || [];\n\n\tif (type === TYPE_BACK_FORWARD) {\n\t\t// Change current url only\n\t\tconst currentIndex = depths.indexOf(currentUrl);\n\n\t\t~currentIndex && setPersistState(CONST_LAST_URL, currentUrl);\n\t} else {\n\t\tconst prevLastUrl = getPersistState(CONST_LAST_URL);\n\n\t\treset(getStorageKey(currentUrl));\n\n\t\tif (type === TYPE_NAVIGATE && url !== prevLastUrl) {\n\t\t\t// Remove all url lists with higher index than current index\n\t\t\tconst prevLastIndex = depths.indexOf(prevLastUrl);\n\t\t\tconst removedList = depths.splice(prevLastIndex + 1, depths.length);\n\n\t\t\tremovedList.forEach(removedUrl => {\n\t\t\t\treset(getStorageKey(removedUrl));\n\t\t\t});\n\t\t\t// If the type is NAVIGATE and there is information about current url, delete it.\n\t\t\tconst currentIndex = depths.indexOf(currentUrl);\n\n\t\t\t~currentIndex && depths.splice(currentIndex, 1);\n\t\t}\n\t\t// Add depth for new address.\n\t\tif (depths.indexOf(url) < 0) {\n\t\t\tdepths.push(url);\n\t\t}\n\t\tsetPersistState(CONST_DEPTHS, depths);\n\t\tsetPersistState(CONST_LAST_URL, url);\n\t}\n}\n\nfunction clearFirst() {\n\tconst depths = getPersistState(CONST_DEPTHS) || [];\n\tconst removed = depths.splice(0, 1);\n\n\tif (!removed.length) {\n\t\t// There is an error because there is no depth to add data.\n\t\treturn false;\n\t}\n\tconst removedUrl = removed[0];\n\n\treset(getStorageKey(removedUrl));\n\tif (currentUrl === removedUrl) {\n\t\tcurrentUrl = \"\";\n\t\tsetPersistState(CONST_LAST_URL, \"\");\n\t\tif (!depths.length) {\n\t\t\t// I tried to add myself, but it didn't add up, so I got an error.\n\t\t\treturn false;\n\t\t}\n\t}\n\tsetPersistState(CONST_DEPTHS, depths);\n\t// Clear the previous record and try to add data again.\n\treturn true;\n}\nfunction clear() {\n\tconst depths = getPersistState(CONST_DEPTHS) || [];\n\n\tdepths.forEach(url => {\n\t\treset(getStorageKey(url));\n\t});\n\n\treset(CONST_PERSIST_STATE);\n\n\tcurrentUrl = \"\";\n}\nif (\"onpopstate\" in window) {\n\twindow.addEventListener(\"popstate\", () => {\n\t\t// popstate event occurs when backward or forward\n\t\tupdateDepth(TYPE_BACK_FORWARD);\n\t});\n}\n\n/**\n * Get or store the current state of the web page using JSON.\n * @ko 웹 페이지의 현재 상태를 JSON 형식으로 저장하거나 읽는다.\n * @alias eg.Persist\n *\n * @support {\"ie\": \"9+\", \"ch\" : \"latest\", \"ff\" : \"latest\",  \"sf\" : \"latest\" , \"edge\" : \"latest\", \"ios\" : \"7+\", \"an\" : \"2.3+ (except 3.x)\"}\n */\nclass Persist {\n\tstatic VERSION = \"#__VERSION__#\";\n\tstatic StorageManager = {\n\t\treset,\n\t\tsetStateByKey,\n\t\tgetStateByKey,\n\t\tgetStorage,\n\t};\n\t/**\n\t * @static\n\t * Clear all information in Persist\n\t */\n\tstatic clear() {\n\t\tclear();\n\t}\n\t/**\n\t * @static\n\t * Return whether you need \"Persist\" module by checking the bfCache support of the current browser\n\t * @return {Boolean}\n\t */\n\tstatic isNeeded() {\n\t\treturn isNeeded;\n\t}\n\t/**\n\t* Constructor\n\t* @param {String} key The key of the state information to be stored <ko>저장할 상태 정보의 키</ko>\n\t**/\n\tconstructor(key) {\n\t\tthis.key = key || \"\";\n\t}\n\n\t/**\n\t * Read value\n\t * @param {String?} path target path\n\t * @return {String|Number|Boolean|Object|Array}\n\t */\n\tget(path) {\n\t\t// update url for pushState, replaceState\n\t\tupdateDepth(TYPE_NAVIGATE);\n\n\t\t// find path\n\t\tconst urlKey = getStorageKey(getUrl());\n\t\tconst globalState =\tgetStateByKey(urlKey, this.key);\n\n\n\t\tif (!path || path.length === 0) {\n\t\t\treturn globalState;\n\t\t}\n\n\t\tconst pathToken = path.split(\".\");\n\n\t\tlet currentItem = globalState;\n\n\t\tlet isTargetExist = true;\n\n\t\tfor (let i = 0; i < pathToken.length; i++) {\n\t\t\tif (!currentItem) {\n\t\t\t\tisTargetExist = false;\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcurrentItem = currentItem[pathToken[i]];\n\t\t}\n\t\tif (!isTargetExist || currentItem == null) {\n\t\t\treturn null;\n\t\t}\n\t\treturn currentItem;\n\t}\n\t/**\n\t * Save value\n\t * @param {String} path target path\n\t * @param {String|Number|Boolean|Object|Array} value value to save\n\t * @return {Persist}\n\t */\n\tset(path, value) {\n\t\t// update url for pushState, replaceState\n\t\tupdateDepth(TYPE_NAVIGATE);\n\t\t// find path\n\t\tconst key = this.key;\n\t\tconst urlKey = getStorageKey(getUrl());\n\t\tconst globalState =\tgetStateByKey(urlKey, key);\n\n\t\ttry {\n\t\t\tif (path.length === 0) {\n\t\t\t\tsetStateByKey(urlKey, key, value);\n\t\t\t} else {\n\t\t\t\tconst allValue = execRec(globalState, path.split(\".\"), (obj, head) => {\n\t\t\t\t\tobj[head] = value;\n\t\t\t\t});\n\n\t\t\t\tsetStateByKey(\n\t\t\t\t\turlKey,\n\t\t\t\t\tkey,\n\t\t\t\t\tallValue\n\t\t\t\t);\n\t\t\t}\n\t\t} catch (e) {\n\t\t\tif (clearFirst(e)) {\n\t\t\t\tthis.set(path, value);\n\t\t\t} else {\n\t\t\t\t// There is no more size to fit in.\n\t\t\t\tthrow e;\n\t\t\t}\n\t\t}\n\t\treturn this;\n\t}\n\t/**\n\t * Remove value\n\t * @param {String} path target path\n\t * @return {Persist}\n\t */\n\tremove(path) {\n\t\t// update url for pushState, replaceState\n\t\tupdateDepth(TYPE_NAVIGATE);\n\n\t\t// find path\n\t\tconst key = this.key;\n\t\tconst urlKey = getStorageKey(getUrl());\n\t\tconst globalState =\tgetStateByKey(urlKey, key);\n\n\t\ttry {\n\t\t\tif (path.length === 0) {\n\t\t\t\tsetStateByKey(urlKey, key, null);\n\t\t\t} else {\n\t\t\t\tconst value = execRec(globalState, path.split(\".\"), (obj, head) => {\n\t\t\t\t\tif (typeof obj === \"object\") {\n\t\t\t\t\t\tdelete obj[head];\n\t\t\t\t\t}\n\t\t\t\t});\n\n\t\t\t\tsetStateByKey(\n\t\t\t\t\turlKey,\n\t\t\t\t\tkey,\n\t\t\t\t\tvalue\n\t\t\t\t);\n\t\t\t}\n\t\t} catch (e) {\n\t\t\tif (clearFirst(e)) {\n\t\t\t\tthis.remove(path);\n\t\t\t} else {\n\t\t\t\t// There is no more size to fit in.\n\t\t\t\tthrow e;\n\t\t\t}\n\t\t}\n\t\treturn this;\n\t}\n}\n\n// If navigation's type is not TYPE_BACK_FORWARD, delete information about current url.\nupdateDepth(getNavigationType());\n\nexport {\n\tupdateDepth,\n};\n\nexport default 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\ No newline at end of file
diff --git a/dist/persist.js b/dist/persist.js
new file mode 100644
index 0000000..6e2d5b2
--- /dev/null
+++ b/dist/persist.js
@@ -0,0 +1,526 @@
+/*
+Copyright (c) 2017 NAVER Corp.
+@egjs/persist project is licensed under the MIT license
+
+@egjs/persist JavaScript library
+
+
+@version 2.4.0
+*/
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	(global.eg = global.eg || {}, global.eg.Persist = factory());
+}(this, (function () { 'use strict';
+
+	var win = typeof window !== "undefined" && window || {};
+	var console$1 = win.console;
+	var document$1 = win.document;
+	var history = win.history;
+	var location = win.location;
+	var navigator = win.navigator;
+	var parseFloat = win.parseFloat;
+	var performance = win.performance;
+	var localStorage = null;
+	var sessionStorage = null;
+
+	try {
+	  localStorage = win.localStorage;
+	  sessionStorage = win.sessionStorage;
+	} catch (e) {}
+
+	var CONST_PERSIST = "___persist___";
+	var CONST_PERSIST_STATE = "state" + CONST_PERSIST;
+	var CONST_DEPTHS = "depths";
+	var CONST_LAST_URL = "lastUrl";
+	var navigation = performance && performance.navigation;
+	var TYPE_NAVIGATE = navigation && navigation.TYPE_NAVIGATE || 0;
+	var TYPE_RELOAD = navigation && navigation.TYPE_RELOAD || 1;
+	var TYPE_BACK_FORWARD = navigation && navigation.TYPE_BACK_FORWARD || 2;
+
+	var isSupportState = history && "replaceState" in history && "state" in history;
+
+	function isStorageAvailable(storage) {
+	  if (!storage) {
+	    return undefined;
+	  }
+
+	  var TMP_KEY = "__tmp__" + CONST_PERSIST;
+
+	  try {
+	    // In case of iOS safari private mode, calling setItem on storage throws error
+	    storage.setItem(TMP_KEY, CONST_PERSIST); // In Chrome incognito mode, can not get saved value
+	    // In IE8, calling storage.getItem occasionally makes "Permission denied" error
+
+	    return storage.getItem(TMP_KEY) === CONST_PERSIST;
+	  } catch (e) {
+	    return false;
+	  }
+	}
+
+	var storage = function () {
+	  var strg;
+
+	  if (isStorageAvailable(sessionStorage)) {
+	    strg = sessionStorage;
+	  } else if (isStorageAvailable(localStorage)) {
+	    strg = localStorage;
+	  }
+
+	  return strg;
+	}();
+
+	function warnInvalidStorageValue() {
+	  /* eslint-disable no-console */
+	  console.warn("window.history or session/localStorage has no valid " + "format data to be handled in persist.");
+	  /* eslint-enable no-console */
+	}
+
+	function getStorage() {
+	  return storage;
+	}
+	/*
+	 * Get state value
+	 */
+
+
+	function getState(key) {
+	  var state;
+	  var stateStr;
+
+	  if (storage) {
+	    stateStr = storage.getItem(key);
+	  } else if (history.state) {
+	    if (typeof history.state === "object" && history.state !== null) {
+	      stateStr = history.state[key];
+	    } else {
+	      warnInvalidStorageValue();
+	    }
+	  } else {
+	    stateStr = history.state;
+	  } // the storage is clean
+
+
+	  if (stateStr === null) {
+	    return {};
+	  } // "null" is not a valid
+
+
+	  var isValidStateStr = typeof stateStr === "string" && stateStr.length > 0 && stateStr !== "null";
+
+	  try {
+	    state = JSON.parse(stateStr); // like '[ ... ]', '1', '1.234', '"123"' is also not valid
+
+	    var isValidType = !(typeof state !== "object" || state instanceof Array);
+
+	    if (!isValidStateStr || !isValidType) {
+	      throw new Error();
+	    }
+	  } catch (e) {
+	    warnInvalidStorageValue();
+	    state = {};
+	  } // Note2 (Android 4.3) return value is null
+
+
+	  return state;
+	}
+
+	function getStateByKey(key, valueKey) {
+	  if (!isSupportState && !storage) {
+	    return undefined;
+	  }
+
+	  var result = getState(key)[valueKey]; // some device returns "null" or undefined
+
+	  if (result === "null" || typeof result === "undefined") {
+	    result = null;
+	  }
+
+	  return result;
+	}
+	/*
+	 * Set state value
+	 */
+
+
+	function setState(key, state) {
+	  if (storage) {
+	    if (state) {
+	      storage.setItem(key, JSON.stringify(state));
+	    } else {
+	      storage.removeItem(key);
+	    }
+	  } else {
+	    try {
+	      var historyState = !history || history.state == null ? {} : history.state;
+
+	      if (history && typeof historyState === "object") {
+	        historyState[key] = JSON.stringify(state);
+	        history.replaceState(historyState, document.title, location.href);
+	      } else {
+	        /* eslint-disable no-console */
+	        console.warn("To use a history object, it must be an object that is not a primitive type.");
+	        /* eslint-enable no-console */
+	      }
+	    } catch (e) {
+	      /* eslint-disable no-console */
+	      console.warn(e.message);
+	      /* eslint-enable no-console */
+	    }
+	  }
+
+	  state ? win[CONST_PERSIST] = true : delete win[CONST_PERSIST];
+	}
+
+	function setStateByKey(key, valueKey, data) {
+	  if (!isSupportState && !storage) {
+	    return;
+	  }
+
+	  var beforeData = getState(key);
+	  beforeData[valueKey] = data;
+	  setState(key, beforeData);
+	}
+	/*
+	 * flush current history state
+	 */
+
+
+	function reset(key) {
+	  setState(key, null);
+	}
+
+	var userAgent = navigator ? navigator.userAgent : "";
+
+	var isNeeded = function () {
+	  var isIOS = new RegExp("iPhone|iPad", "i").test(userAgent);
+	  var isMacSafari = new RegExp("Mac", "i").test(userAgent) && !new RegExp("Chrome", "i").test(userAgent) && new RegExp("Apple", "i").test(userAgent);
+	  var isAndroid = new RegExp("Android ", "i").test(userAgent);
+	  var isWebview = new RegExp("wv; |inapp;", "i").test(userAgent);
+	  var androidVersion = isAndroid ? parseFloat(new RegExp("(Android)\\s([\\d_\\.]+|\\d_0)", "i").exec(userAgent)[2]) : undefined;
+	  return !(isIOS || isMacSafari || isAndroid && (androidVersion <= 4.3 && isWebview || androidVersion < 3));
+	}(); // In case of IE8, TYPE_BACK_FORWARD is undefined.
+
+
+	function getNavigationType() {
+	  return performance && performance.navigation && performance.navigation.type;
+	}
+
+	function getUrl() {
+	  return location ? location.href.split("#")[0] : "";
+	}
+
+	function getStorageKey(name) {
+	  return name + CONST_PERSIST;
+	}
+
+	/* eslint-disable no-use-before-define */
+	var currentUrl = "";
+
+	function execRec(obj, path, func) {
+	  var _obj = obj;
+
+	  if (!_obj) {
+	    _obj = isNaN(path[0]) ? {} : [];
+	  }
+
+	  var head = path.shift();
+
+	  if (path.length === 0) {
+	    if (_obj instanceof Array && isNaN(head)) {
+	      console$1.warn("Don't use key string on array");
+	    }
+
+	    func(_obj, head);
+	    return _obj;
+	  }
+
+	  _obj[head] = execRec(_obj[head], path, func);
+	  return _obj;
+	}
+
+	function setPersistState(key, value) {
+	  try {
+	    setStateByKey(CONST_PERSIST_STATE, key, value);
+	  } catch (e) {
+	    if (clearFirst()) {
+	      if (key === CONST_LAST_URL) {
+	        setPersistState(key, value);
+	      } else if (key === CONST_DEPTHS) {
+	        setPersistState(key, value && value.slice(1));
+	      }
+	    } else {
+	      // There is no more size to fit in.
+	      throw e;
+	    }
+	  }
+	}
+
+	function getPersistState(key) {
+	  return getStateByKey(CONST_PERSIST_STATE, key);
+	}
+
+	function updateDepth(type) {
+	  if (type === void 0) {
+	    type = 0;
+	  }
+
+	  var url = getUrl();
+
+	  if (currentUrl === url) {
+	    return;
+	  } // url is not the same for the first time, pushState, or replaceState.
+
+
+	  currentUrl = url;
+	  var depths = getPersistState(CONST_DEPTHS) || [];
+
+	  if (type === TYPE_BACK_FORWARD) {
+	    // Change current url only
+	    var currentIndex = depths.indexOf(currentUrl);
+	    ~currentIndex && setPersistState(CONST_LAST_URL, currentUrl);
+	  } else {
+	    var prevLastUrl = getPersistState(CONST_LAST_URL);
+	    reset(getStorageKey(currentUrl));
+
+	    if (type === TYPE_NAVIGATE && url !== prevLastUrl) {
+	      // Remove all url lists with higher index than current index
+	      var prevLastIndex = depths.indexOf(prevLastUrl);
+	      var removedList = depths.splice(prevLastIndex + 1, depths.length);
+	      removedList.forEach(function (removedUrl) {
+	        reset(getStorageKey(removedUrl));
+	      }); // If the type is NAVIGATE and there is information about current url, delete it.
+
+	      var _currentIndex = depths.indexOf(currentUrl);
+
+	      ~_currentIndex && depths.splice(_currentIndex, 1);
+	    } // Add depth for new address.
+
+
+	    if (depths.indexOf(url) < 0) {
+	      depths.push(url);
+	    }
+
+	    setPersistState(CONST_DEPTHS, depths);
+	    setPersistState(CONST_LAST_URL, url);
+	  }
+	}
+
+	function clearFirst() {
+	  var depths = getPersistState(CONST_DEPTHS) || [];
+	  var removed = depths.splice(0, 1);
+
+	  if (!removed.length) {
+	    // There is an error because there is no depth to add data.
+	    return false;
+	  }
+
+	  var removedUrl = removed[0];
+	  reset(getStorageKey(removedUrl));
+
+	  if (currentUrl === removedUrl) {
+	    currentUrl = "";
+	    setPersistState(CONST_LAST_URL, "");
+
+	    if (!depths.length) {
+	      // I tried to add myself, but it didn't add up, so I got an error.
+	      return false;
+	    }
+	  }
+
+	  setPersistState(CONST_DEPTHS, depths); // Clear the previous record and try to add data again.
+
+	  return true;
+	}
+
+	function _clear() {
+	  var depths = getPersistState(CONST_DEPTHS) || [];
+	  depths.forEach(function (url) {
+	    reset(getStorageKey(url));
+	  });
+	  reset(CONST_PERSIST_STATE);
+	  currentUrl = "";
+	}
+
+	if ("onpopstate" in win) {
+	  win.addEventListener("popstate", function () {
+	    // popstate event occurs when backward or forward
+	    updateDepth(TYPE_BACK_FORWARD);
+	  });
+	}
+	/**
+	 * Get or store the current state of the web page using JSON.
+	 * @ko 웹 페이지의 현재 상태를 JSON 형식으로 저장하거나 읽는다.
+	 * @alias eg.Persist
+	 *
+	 * @support {"ie": "9+", "ch" : "latest", "ff" : "latest",  "sf" : "latest" , "edge" : "latest", "ios" : "7+", "an" : "2.3+ (except 3.x)"}
+	 */
+
+
+	var Persist =
+	/*#__PURE__*/
+	function () {
+	  var Persist =
+	  /*#__PURE__*/
+	  function () {
+	    /**
+	     * @static
+	     * Clear all information in Persist
+	     */
+	    Persist.clear = function clear() {
+	      _clear();
+	    };
+	    /**
+	     * @static
+	     * Return whether you need "Persist" module by checking the bfCache support of the current browser
+	     * @return {Boolean}
+	     */
+
+
+	    Persist.isNeeded = function isNeeded$$1() {
+	      return isNeeded;
+	    };
+	    /**
+	    * Constructor
+	    * @param {String} key The key of the state information to be stored <ko>저장할 상태 정보의 키</ko>
+	    **/
+
+
+	    function Persist(key) {
+	      this.key = key || "";
+	    }
+	    /**
+	     * Read value
+	     * @param {String?} path target path
+	     * @return {String|Number|Boolean|Object|Array}
+	     */
+
+
+	    var _proto = Persist.prototype;
+
+	    _proto.get = function get(path) {
+	      // update url for pushState, replaceState
+	      updateDepth(TYPE_NAVIGATE); // find path
+
+	      var urlKey = getStorageKey(getUrl());
+	      var globalState = getStateByKey(urlKey, this.key);
+
+	      if (!path || path.length === 0) {
+	        return globalState;
+	      }
+
+	      var pathToken = path.split(".");
+	      var currentItem = globalState;
+	      var isTargetExist = true;
+
+	      for (var i = 0; i < pathToken.length; i++) {
+	        if (!currentItem) {
+	          isTargetExist = false;
+	          break;
+	        }
+
+	        currentItem = currentItem[pathToken[i]];
+	      }
+
+	      if (!isTargetExist || currentItem == null) {
+	        return null;
+	      }
+
+	      return currentItem;
+	    };
+	    /**
+	     * Save value
+	     * @param {String} path target path
+	     * @param {String|Number|Boolean|Object|Array} value value to save
+	     * @return {Persist}
+	     */
+
+
+	    _proto.set = function set(path, value) {
+	      // update url for pushState, replaceState
+	      updateDepth(TYPE_NAVIGATE); // find path
+
+	      var key = this.key;
+	      var urlKey = getStorageKey(getUrl());
+	      var globalState = getStateByKey(urlKey, key);
+
+	      try {
+	        if (path.length === 0) {
+	          setStateByKey(urlKey, key, value);
+	        } else {
+	          var allValue = execRec(globalState, path.split("."), function (obj, head) {
+	            obj[head] = value;
+	          });
+	          setStateByKey(urlKey, key, allValue);
+	        }
+	      } catch (e) {
+	        if (clearFirst(e)) {
+	          this.set(path, value);
+	        } else {
+	          // There is no more size to fit in.
+	          throw e;
+	        }
+	      }
+
+	      return this;
+	    };
+	    /**
+	     * Remove value
+	     * @param {String} path target path
+	     * @return {Persist}
+	     */
+
+
+	    _proto.remove = function remove(path) {
+	      // update url for pushState, replaceState
+	      updateDepth(TYPE_NAVIGATE); // find path
+
+	      var key = this.key;
+	      var urlKey = getStorageKey(getUrl());
+	      var globalState = getStateByKey(urlKey, key);
+
+	      try {
+	        if (path.length === 0) {
+	          setStateByKey(urlKey, key, null);
+	        } else {
+	          var value = execRec(globalState, path.split("."), function (obj, head) {
+	            if (typeof obj === "object") {
+	              delete obj[head];
+	            }
+	          });
+	          setStateByKey(urlKey, key, value);
+	        }
+	      } catch (e) {
+	        if (clearFirst(e)) {
+	          this.remove(path);
+	        } else {
+	          // There is no more size to fit in.
+	          throw e;
+	        }
+	      }
+
+	      return this;
+	    };
+
+	    return Persist;
+	  }();
+
+	  Persist.VERSION = "2.4.0";
+	  Persist.StorageManager = {
+	    reset: reset,
+	    setStateByKey: setStateByKey,
+	    getStateByKey: getStateByKey,
+	    getStorage: getStorage
+	  };
+	  return Persist;
+	}(); // If navigation's type is not TYPE_BACK_FORWARD, delete information about current url.
+
+
+	updateDepth(getNavigationType());
+
+	Persist.updateDepth = updateDepth;
+
+	return Persist;
+
+})));
+//# sourceMappingURL=persist.js.map
diff --git a/dist/persist.js.map b/dist/persist.js.map
new file mode 100644
index 0000000..e3fb252
--- /dev/null
+++ b/dist/persist.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"persist.js","sources":["../src/browser.js","../src/consts.js","../src/storageManager.js","../src/utils.js","../src/Persist.js","../src/index.umd.js"],"sourcesContent":["const win = (typeof window !== `undefined` && window) || {};\n\nexport {win as window};\nexport const console = win.console;\nexport const document = win.document;\nexport const history = win.history;\nexport const location = win.location;\nexport const navigator = win.navigator;\nexport const parseFloat = win.parseFloat;\nexport const performance = win.performance;\n\nlet localStorage = null;\n\nlet sessionStorage = null;\n\ntry {\n\tlocalStorage = win.localStorage;\n\tsessionStorage = win.sessionStorage;\n} catch (e) {\n}\n\nexport {\n\tlocalStorage,\n\tsessionStorage,\n};\n","import {performance} from \"./browser\";\n\nexport const CONST_PERSIST = \"___persist___\";\nexport const CONST_PERSIST_STATE = `state${CONST_PERSIST}`;\nexport const CONST_DEPTHS = \"depths\";\nexport const CONST_LAST_URL = \"lastUrl\";\nconst navigation = performance && performance.navigation;\n\nexport const TYPE_NAVIGATE = (navigation && navigation.TYPE_NAVIGATE) || 0;\nexport const TYPE_RELOAD = (navigation && navigation.TYPE_RELOAD) || 1;\nexport const TYPE_BACK_FORWARD = (navigation && navigation.TYPE_BACK_FORWARD) || 2;\n","import {window, history, location, sessionStorage, localStorage} from \"./browser\";\nimport {CONST_PERSIST} from \"./consts\";\n\nconst isSupportState = history && \"replaceState\" in history && \"state\" in history;\n\nfunction isStorageAvailable(storage) {\n\tif (!storage) {\n\t\treturn undefined;\n\t}\n\tconst TMP_KEY = `__tmp__${CONST_PERSIST}`;\n\n\ttry {\n\t\t// In case of iOS safari private mode, calling setItem on storage throws error\n\t\tstorage.setItem(TMP_KEY, CONST_PERSIST);\n\n\t\t// In Chrome incognito mode, can not get saved value\n\t\t// In IE8, calling storage.getItem occasionally makes \"Permission denied\" error\n\t\treturn storage.getItem(TMP_KEY) === CONST_PERSIST;\n\t} catch (e) {\n\t\treturn false;\n\t}\n}\n\nconst storage = (function() {\n\tlet strg;\n\n\tif (isStorageAvailable(sessionStorage)) {\n\t\tstrg = sessionStorage;\n\t} else if (isStorageAvailable(localStorage)) {\n\t\tstrg = localStorage;\n\t}\n\n\treturn strg;\n})();\n\nfunction warnInvalidStorageValue() {\n\t/* eslint-disable no-console */\n\tconsole.warn(\"window.history or session/localStorage has no valid \" +\n\t\t\t\"format data to be handled in persist.\");\n\t/* eslint-enable no-console */\n}\n\nfunction getStorage() {\n\treturn storage;\n}\n\n/*\n * Get state value\n */\nfunction getState(key) {\n\tlet state;\n\n\tlet stateStr;\n\n\tif (storage) {\n\t\tstateStr = storage.getItem(key);\n\t} else if (history.state) {\n\t\tif (typeof history.state === \"object\" && history.state !== null) {\n\t\t\tstateStr = history.state[key];\n\t\t} else {\n\t\t\twarnInvalidStorageValue();\n\t\t}\n\t} else {\n\t\tstateStr = history.state;\n\t}\n\n\t// the storage is clean\n\tif (stateStr === null) {\n\t\treturn {};\n\t}\n\n\t// \"null\" is not a valid\n\tconst isValidStateStr = typeof stateStr === \"string\" &&\n\t\t\t\t\t\t\t\tstateStr.length > 0 && stateStr !== \"null\";\n\n\ttry {\n\t\tstate = JSON.parse(stateStr);\n\n\t\t// like '[ ... ]', '1', '1.234', '\"123\"' is also not valid\n\t\tconst isValidType = !(typeof state !== \"object\" || state instanceof Array);\n\n\t\tif (!isValidStateStr || !isValidType) {\n\t\t\tthrow new Error();\n\t\t}\n\t} catch (e) {\n\t\twarnInvalidStorageValue();\n\t\tstate = {};\n\t}\n\n\t// Note2 (Android 4.3) return value is null\n\treturn state;\n}\n\nfunction getStateByKey(key, valueKey) {\n\tif (!isSupportState && !storage) {\n\t\treturn undefined;\n\t}\n\n\tlet result = getState(key)[valueKey];\n\n\t// some device returns \"null\" or undefined\n\tif (result === \"null\" || typeof result === \"undefined\") {\n\t\tresult = null;\n\t}\n\treturn result;\n}\n\n/*\n * Set state value\n */\nfunction setState(key, state) {\n\tif (storage) {\n\t\tif (state) {\n\t\t\tstorage.setItem(\n\t\t\t\tkey, JSON.stringify(state));\n\t\t} else {\n\t\t\tstorage.removeItem(key);\n\t\t}\n\t} else {\n\t\ttry {\n\t\t\tconst historyState = !history || history.state == null ? {} : history.state;\n\n\t\t\tif (history && typeof historyState === \"object\") {\n\t\t\t\thistoryState[key] = JSON.stringify(state);\n\t\t\t\thistory.replaceState(\n\t\t\t\t\thistoryState,\n\t\t\t\t\tdocument.title,\n\t\t\t\t\tlocation.href\n\t\t\t\t);\n\t\t\t} else {\n\t\t\t\t/* eslint-disable no-console */\n\t\t\t\tconsole.warn(\"To use a history object, it must be an object that is not a primitive type.\");\n\t\t\t\t/* eslint-enable no-console */\n\t\t\t}\n\t\t} catch (e) {\n\t\t\t/* eslint-disable no-console */\n\t\t\tconsole.warn(e.message);\n\t\t\t/* eslint-enable no-console */\n\t\t}\n\t}\n\n\tstate ? window[CONST_PERSIST] = true : delete window[CONST_PERSIST];\n}\n\nfunction setStateByKey(key, valueKey, data) {\n\tif (!isSupportState && !storage) {\n\t\treturn;\n\t}\n\n\tconst beforeData = getState(key);\n\n\tbeforeData[valueKey] = data;\n\tsetState(key, beforeData);\n}\n\n/*\n * flush current history state\n */\nfunction reset(key) {\n\tsetState(key, null);\n}\n\nexport {\n\treset,\n\tsetStateByKey,\n\tgetStateByKey,\n\tgetStorage,\n};\n","import {navigator, parseFloat, performance, location} from \"./browser\";\nimport {CONST_PERSIST} from \"./consts\";\n\nconst userAgent = navigator ? navigator.userAgent : \"\";\n\nconst isNeeded = (function() {\n\tconst isIOS = (new RegExp(\"iPhone|iPad\", \"i\")).test(userAgent);\n\tconst isMacSafari = (new RegExp(\"Mac\", \"i\")).test(userAgent) &&\n\t\t!(new RegExp(\"Chrome\", \"i\")).test(userAgent) &&\n\t\t(new RegExp(\"Apple\", \"i\")).test(userAgent);\n\tconst isAndroid = (new RegExp(\"Android \", \"i\")).test(userAgent);\n\tconst isWebview = (new RegExp(\"wv; |inapp;\", \"i\")).test(userAgent);\n\tconst androidVersion = isAndroid ? parseFloat(new RegExp(\n\t\t\"(Android)\\\\s([\\\\d_\\\\.]+|\\\\d_0)\", \"i\"\n\t).exec(userAgent)[2]) : undefined;\n\n\treturn !(isIOS ||\n\t\t\tisMacSafari ||\n\t\t\t(isAndroid &&\n\t\t\t\t((androidVersion <= 4.3 && isWebview) || androidVersion < 3)));\n})();\n\n// In case of IE8, TYPE_BACK_FORWARD is undefined.\nfunction getNavigationType() {\n\treturn performance && performance.navigation &&\n\t\tperformance.navigation.type;\n}\nfunction getUrl() {\n\treturn location ? location.href.split(\"#\")[0] : \"\";\n}\nfunction getStorageKey(name) {\n\treturn name + CONST_PERSIST;\n}\n\nexport {\n\tgetUrl,\n\tgetStorageKey,\n\tgetNavigationType,\n\tisNeeded,\n};\n","/* eslint-disable no-use-before-define */\nimport {\n\treset,\n\tsetStateByKey,\n\tgetStateByKey,\n\tgetStorage,\n} from \"./storageManager\";\nimport {isNeeded, getUrl, getStorageKey, getNavigationType} from \"./utils\";\nimport {console, window} from \"./browser\";\nimport {TYPE_BACK_FORWARD, TYPE_NAVIGATE, CONST_PERSIST_STATE, CONST_DEPTHS, CONST_LAST_URL} from \"./consts\";\n\nlet currentUrl = \"\";\n\n\nfunction execRec(obj, path, func) {\n\tlet _obj = obj;\n\n\tif (!_obj) {\n\t\t_obj = isNaN(path[0]) ? {} : [];\n\t}\n\n\tconst head = path.shift();\n\n\tif (path.length === 0) {\n\t\tif (_obj instanceof Array && isNaN(head)) {\n\t\t\tconsole.warn(\"Don't use key string on array\");\n\t\t}\n\t\tfunc(_obj, head);\n\t\treturn _obj;\n\t}\n\n\t_obj[head] = execRec(_obj[head], path, func);\n\treturn _obj;\n}\n\nfunction setPersistState(key, value) {\n\ttry {\n\t\tsetStateByKey(CONST_PERSIST_STATE, key, value);\n\t} catch (e) {\n\t\tif (clearFirst()) {\n\t\t\tif (key === CONST_LAST_URL) {\n\t\t\t\tsetPersistState(key, value);\n\t\t\t} else if (key === CONST_DEPTHS) {\n\t\t\t\tsetPersistState(key, value && value.slice(1));\n\t\t\t}\n\t\t} else {\n\t\t\t// There is no more size to fit in.\n\t\t\tthrow e;\n\t\t}\n\t}\n}\nfunction getPersistState(key) {\n\treturn getStateByKey(CONST_PERSIST_STATE, key);\n}\nfunction updateDepth(type = 0) {\n\tconst url = getUrl();\n\n\tif (currentUrl === url) {\n\t\treturn;\n\t}\n\t// url is not the same for the first time, pushState, or replaceState.\n\tcurrentUrl = url;\n\tconst depths = getPersistState(CONST_DEPTHS) || [];\n\n\tif (type === TYPE_BACK_FORWARD) {\n\t\t// Change current url only\n\t\tconst currentIndex = depths.indexOf(currentUrl);\n\n\t\t~currentIndex && setPersistState(CONST_LAST_URL, currentUrl);\n\t} else {\n\t\tconst prevLastUrl = getPersistState(CONST_LAST_URL);\n\n\t\treset(getStorageKey(currentUrl));\n\n\t\tif (type === TYPE_NAVIGATE && url !== prevLastUrl) {\n\t\t\t// Remove all url lists with higher index than current index\n\t\t\tconst prevLastIndex = depths.indexOf(prevLastUrl);\n\t\t\tconst removedList = depths.splice(prevLastIndex + 1, depths.length);\n\n\t\t\tremovedList.forEach(removedUrl => {\n\t\t\t\treset(getStorageKey(removedUrl));\n\t\t\t});\n\t\t\t// If the type is NAVIGATE and there is information about current url, delete it.\n\t\t\tconst currentIndex = depths.indexOf(currentUrl);\n\n\t\t\t~currentIndex && depths.splice(currentIndex, 1);\n\t\t}\n\t\t// Add depth for new address.\n\t\tif (depths.indexOf(url) < 0) {\n\t\t\tdepths.push(url);\n\t\t}\n\t\tsetPersistState(CONST_DEPTHS, depths);\n\t\tsetPersistState(CONST_LAST_URL, url);\n\t}\n}\n\nfunction clearFirst() {\n\tconst depths = getPersistState(CONST_DEPTHS) || [];\n\tconst removed = depths.splice(0, 1);\n\n\tif (!removed.length) {\n\t\t// There is an error because there is no depth to add data.\n\t\treturn false;\n\t}\n\tconst removedUrl = removed[0];\n\n\treset(getStorageKey(removedUrl));\n\tif (currentUrl === removedUrl) {\n\t\tcurrentUrl = \"\";\n\t\tsetPersistState(CONST_LAST_URL, \"\");\n\t\tif (!depths.length) {\n\t\t\t// I tried to add myself, but it didn't add up, so I got an error.\n\t\t\treturn false;\n\t\t}\n\t}\n\tsetPersistState(CONST_DEPTHS, depths);\n\t// Clear the previous record and try to add data again.\n\treturn true;\n}\nfunction clear() {\n\tconst depths = getPersistState(CONST_DEPTHS) || [];\n\n\tdepths.forEach(url => {\n\t\treset(getStorageKey(url));\n\t});\n\n\treset(CONST_PERSIST_STATE);\n\n\tcurrentUrl = \"\";\n}\nif (\"onpopstate\" in window) {\n\twindow.addEventListener(\"popstate\", () => {\n\t\t// popstate event occurs when backward or forward\n\t\tupdateDepth(TYPE_BACK_FORWARD);\n\t});\n}\n\n/**\n * Get or store the current state of the web page using JSON.\n * @ko 웹 페이지의 현재 상태를 JSON 형식으로 저장하거나 읽는다.\n * @alias eg.Persist\n *\n * @support {\"ie\": \"9+\", \"ch\" : \"latest\", \"ff\" : \"latest\",  \"sf\" : \"latest\" , \"edge\" : \"latest\", \"ios\" : \"7+\", \"an\" : \"2.3+ (except 3.x)\"}\n */\nclass Persist {\n\tstatic VERSION = \"#__VERSION__#\";\n\tstatic StorageManager = {\n\t\treset,\n\t\tsetStateByKey,\n\t\tgetStateByKey,\n\t\tgetStorage,\n\t};\n\t/**\n\t * @static\n\t * Clear all information in Persist\n\t */\n\tstatic clear() {\n\t\tclear();\n\t}\n\t/**\n\t * @static\n\t * 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diff --git a/dist/persist.min.js b/dist/persist.min.js
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+{"version":3,"file":"persist.min.js","sources":["../src/browser.js","../src/consts.js","../src/storageManager.js","../src/utils.js","../src/Persist.js","../src/index.umd.js"],"sourcesContent":["const win = (typeof window !== `undefined` && window) || {};\n\nexport {win as window};\nexport const console = win.console;\nexport const document = win.document;\nexport const history = win.history;\nexport const location = win.location;\nexport const navigator = win.navigator;\nexport const parseFloat = win.parseFloat;\nexport const performance = win.performance;\n\nlet localStorage = null;\n\nlet sessionStorage = null;\n\ntry {\n\tlocalStorage = win.localStorage;\n\tsessionStorage = win.sessionStorage;\n} catch (e) {\n}\n\nexport {\n\tlocalStorage,\n\tsessionStorage,\n};\n","import {performance} from \"./browser\";\n\nexport const CONST_PERSIST = \"___persist___\";\nexport const CONST_PERSIST_STATE = `state${CONST_PERSIST}`;\nexport const CONST_DEPTHS = \"depths\";\nexport const CONST_LAST_URL = \"lastUrl\";\nconst navigation = performance && performance.navigation;\n\nexport const TYPE_NAVIGATE = (navigation && navigation.TYPE_NAVIGATE) || 0;\nexport const TYPE_RELOAD = (navigation && navigation.TYPE_RELOAD) || 1;\nexport const TYPE_BACK_FORWARD = (navigation && navigation.TYPE_BACK_FORWARD) || 2;\n","import {window, history, location, sessionStorage, localStorage} from \"./browser\";\nimport {CONST_PERSIST} from \"./consts\";\n\nconst isSupportState = history && \"replaceState\" in history && \"state\" in history;\n\nfunction isStorageAvailable(storage) {\n\tif (!storage) {\n\t\treturn undefined;\n\t}\n\tconst TMP_KEY = `__tmp__${CONST_PERSIST}`;\n\n\ttry {\n\t\t// In case of iOS safari private mode, calling setItem on storage throws error\n\t\tstorage.setItem(TMP_KEY, CONST_PERSIST);\n\n\t\t// In Chrome incognito mode, can not get saved value\n\t\t// In IE8, calling storage.getItem occasionally makes \"Permission denied\" error\n\t\treturn storage.getItem(TMP_KEY) === CONST_PERSIST;\n\t} catch (e) {\n\t\treturn false;\n\t}\n}\n\nconst storage = (function() {\n\tlet strg;\n\n\tif (isStorageAvailable(sessionStorage)) {\n\t\tstrg = sessionStorage;\n\t} else if (isStorageAvailable(localStorage)) {\n\t\tstrg = localStorage;\n\t}\n\n\treturn strg;\n})();\n\nfunction warnInvalidStorageValue() {\n\t/* eslint-disable no-console */\n\tconsole.warn(\"window.history or session/localStorage has no valid \" +\n\t\t\t\"format data to be handled in persist.\");\n\t/* eslint-enable no-console */\n}\n\nfunction getStorage() {\n\treturn storage;\n}\n\n/*\n * Get state value\n */\nfunction getState(key) {\n\tlet state;\n\n\tlet stateStr;\n\n\tif (storage) {\n\t\tstateStr = storage.getItem(key);\n\t} else if (history.state) {\n\t\tif (typeof history.state === \"object\" && history.state !== null) {\n\t\t\tstateStr = history.state[key];\n\t\t} else {\n\t\t\twarnInvalidStorageValue();\n\t\t}\n\t} else {\n\t\tstateStr = history.state;\n\t}\n\n\t// the storage is clean\n\tif (stateStr === null) {\n\t\treturn {};\n\t}\n\n\t// \"null\" is not a valid\n\tconst isValidStateStr = typeof stateStr === \"string\" &&\n\t\t\t\t\t\t\t\tstateStr.length > 0 && stateStr !== \"null\";\n\n\ttry {\n\t\tstate = JSON.parse(stateStr);\n\n\t\t// like '[ ... ]', '1', '1.234', '\"123\"' is also not valid\n\t\tconst isValidType = !(typeof state !== \"object\" || state instanceof Array);\n\n\t\tif (!isValidStateStr || !isValidType) {\n\t\t\tthrow new Error();\n\t\t}\n\t} catch (e) {\n\t\twarnInvalidStorageValue();\n\t\tstate = {};\n\t}\n\n\t// Note2 (Android 4.3) return value is null\n\treturn state;\n}\n\nfunction getStateByKey(key, valueKey) {\n\tif (!isSupportState && !storage) {\n\t\treturn undefined;\n\t}\n\n\tlet result = getState(key)[valueKey];\n\n\t// some device returns \"null\" or undefined\n\tif (result === \"null\" || typeof result === \"undefined\") {\n\t\tresult = null;\n\t}\n\treturn result;\n}\n\n/*\n * Set state value\n */\nfunction setState(key, state) {\n\tif (storage) {\n\t\tif (state) {\n\t\t\tstorage.setItem(\n\t\t\t\tkey, JSON.stringify(state));\n\t\t} else {\n\t\t\tstorage.removeItem(key);\n\t\t}\n\t} else {\n\t\ttry {\n\t\t\tconst historyState = !history || history.state == null ? {} : history.state;\n\n\t\t\tif (history && typeof historyState === \"object\") {\n\t\t\t\thistoryState[key] = JSON.stringify(state);\n\t\t\t\thistory.replaceState(\n\t\t\t\t\thistoryState,\n\t\t\t\t\tdocument.title,\n\t\t\t\t\tlocation.href\n\t\t\t\t);\n\t\t\t} else {\n\t\t\t\t/* eslint-disable no-console */\n\t\t\t\tconsole.warn(\"To use a history object, it must be an object that is not a primitive type.\");\n\t\t\t\t/* eslint-enable no-console */\n\t\t\t}\n\t\t} catch (e) {\n\t\t\t/* eslint-disable no-console */\n\t\t\tconsole.warn(e.message);\n\t\t\t/* eslint-enable no-console */\n\t\t}\n\t}\n\n\tstate ? window[CONST_PERSIST] = true : delete window[CONST_PERSIST];\n}\n\nfunction setStateByKey(key, valueKey, data) {\n\tif (!isSupportState && !storage) {\n\t\treturn;\n\t}\n\n\tconst beforeData = getState(key);\n\n\tbeforeData[valueKey] = data;\n\tsetState(key, beforeData);\n}\n\n/*\n * flush current history state\n */\nfunction reset(key) {\n\tsetState(key, null);\n}\n\nexport {\n\treset,\n\tsetStateByKey,\n\tgetStateByKey,\n\tgetStorage,\n};\n","import {navigator, parseFloat, performance, location} from \"./browser\";\nimport {CONST_PERSIST} from \"./consts\";\n\nconst userAgent = navigator ? navigator.userAgent : \"\";\n\nconst isNeeded = (function() {\n\tconst isIOS = (new RegExp(\"iPhone|iPad\", \"i\")).test(userAgent);\n\tconst isMacSafari = (new RegExp(\"Mac\", \"i\")).test(userAgent) &&\n\t\t!(new RegExp(\"Chrome\", \"i\")).test(userAgent) &&\n\t\t(new RegExp(\"Apple\", \"i\")).test(userAgent);\n\tconst isAndroid = (new RegExp(\"Android \", \"i\")).test(userAgent);\n\tconst isWebview = (new RegExp(\"wv; |inapp;\", \"i\")).test(userAgent);\n\tconst androidVersion = isAndroid ? parseFloat(new RegExp(\n\t\t\"(Android)\\\\s([\\\\d_\\\\.]+|\\\\d_0)\", \"i\"\n\t).exec(userAgent)[2]) : undefined;\n\n\treturn !(isIOS ||\n\t\t\tisMacSafari ||\n\t\t\t(isAndroid &&\n\t\t\t\t((androidVersion <= 4.3 && isWebview) || androidVersion < 3)));\n})();\n\n// In case of IE8, TYPE_BACK_FORWARD is undefined.\nfunction getNavigationType() {\n\treturn performance && performance.navigation &&\n\t\tperformance.navigation.type;\n}\nfunction getUrl() {\n\treturn location ? location.href.split(\"#\")[0] : \"\";\n}\nfunction getStorageKey(name) {\n\treturn name + CONST_PERSIST;\n}\n\nexport {\n\tgetUrl,\n\tgetStorageKey,\n\tgetNavigationType,\n\tisNeeded,\n};\n","/* eslint-disable no-use-before-define */\nimport {\n\treset,\n\tsetStateByKey,\n\tgetStateByKey,\n\tgetStorage,\n} from \"./storageManager\";\nimport {isNeeded, getUrl, getStorageKey, getNavigationType} from \"./utils\";\nimport {console, window} from \"./browser\";\nimport {TYPE_BACK_FORWARD, TYPE_NAVIGATE, CONST_PERSIST_STATE, CONST_DEPTHS, CONST_LAST_URL} from \"./consts\";\n\nlet currentUrl = \"\";\n\n\nfunction execRec(obj, path, func) {\n\tlet _obj = obj;\n\n\tif (!_obj) {\n\t\t_obj = isNaN(path[0]) ? {} : [];\n\t}\n\n\tconst head = path.shift();\n\n\tif (path.length === 0) {\n\t\tif (_obj instanceof Array && isNaN(head)) {\n\t\t\tconsole.warn(\"Don't use key string on array\");\n\t\t}\n\t\tfunc(_obj, head);\n\t\treturn _obj;\n\t}\n\n\t_obj[head] = execRec(_obj[head], path, func);\n\treturn _obj;\n}\n\nfunction setPersistState(key, value) {\n\ttry {\n\t\tsetStateByKey(CONST_PERSIST_STATE, key, value);\n\t} catch (e) {\n\t\tif (clearFirst()) {\n\t\t\tif (key === CONST_LAST_URL) {\n\t\t\t\tsetPersistState(key, value);\n\t\t\t} else if (key === CONST_DEPTHS) {\n\t\t\t\tsetPersistState(key, value && value.slice(1));\n\t\t\t}\n\t\t} else {\n\t\t\t// There is no more size to fit in.\n\t\t\tthrow e;\n\t\t}\n\t}\n}\nfunction getPersistState(key) {\n\treturn getStateByKey(CONST_PERSIST_STATE, key);\n}\nfunction updateDepth(type = 0) {\n\tconst url = getUrl();\n\n\tif (currentUrl === url) {\n\t\treturn;\n\t}\n\t// url is not the same for the first time, pushState, or replaceState.\n\tcurrentUrl = url;\n\tconst depths = getPersistState(CONST_DEPTHS) || [];\n\n\tif (type === TYPE_BACK_FORWARD) {\n\t\t// Change current url only\n\t\tconst currentIndex = depths.indexOf(currentUrl);\n\n\t\t~currentIndex && setPersistState(CONST_LAST_URL, currentUrl);\n\t} else {\n\t\tconst prevLastUrl = getPersistState(CONST_LAST_URL);\n\n\t\treset(getStorageKey(currentUrl));\n\n\t\tif (type === TYPE_NAVIGATE && url !== prevLastUrl) {\n\t\t\t// Remove all url lists with higher index than current index\n\t\t\tconst prevLastIndex = depths.indexOf(prevLastUrl);\n\t\t\tconst removedList = depths.splice(prevLastIndex + 1, depths.length);\n\n\t\t\tremovedList.forEach(removedUrl => {\n\t\t\t\treset(getStorageKey(removedUrl));\n\t\t\t});\n\t\t\t// If the type is NAVIGATE and there is information about current url, delete it.\n\t\t\tconst currentIndex = depths.indexOf(currentUrl);\n\n\t\t\t~currentIndex && depths.splice(currentIndex, 1);\n\t\t}\n\t\t// Add depth for new address.\n\t\tif (depths.indexOf(url) < 0) {\n\t\t\tdepths.push(url);\n\t\t}\n\t\tsetPersistState(CONST_DEPTHS, depths);\n\t\tsetPersistState(CONST_LAST_URL, url);\n\t}\n}\n\nfunction clearFirst() {\n\tconst depths = getPersistState(CONST_DEPTHS) || [];\n\tconst removed = depths.splice(0, 1);\n\n\tif (!removed.length) {\n\t\t// There is an error because there is no depth to add data.\n\t\treturn false;\n\t}\n\tconst removedUrl = removed[0];\n\n\treset(getStorageKey(removedUrl));\n\tif (currentUrl === removedUrl) {\n\t\tcurrentUrl = \"\";\n\t\tsetPersistState(CONST_LAST_URL, \"\");\n\t\tif (!depths.length) {\n\t\t\t// I tried to add myself, but it didn't add up, so I got an error.\n\t\t\treturn false;\n\t\t}\n\t}\n\tsetPersistState(CONST_DEPTHS, depths);\n\t// Clear the previous record and try to add data again.\n\treturn true;\n}\nfunction clear() {\n\tconst depths = getPersistState(CONST_DEPTHS) || [];\n\n\tdepths.forEach(url => {\n\t\treset(getStorageKey(url));\n\t});\n\n\treset(CONST_PERSIST_STATE);\n\n\tcurrentUrl = \"\";\n}\nif (\"onpopstate\" in window) {\n\twindow.addEventListener(\"popstate\", () => {\n\t\t// popstate event occurs when backward or forward\n\t\tupdateDepth(TYPE_BACK_FORWARD);\n\t});\n}\n\n/**\n * Get or store the current state of the web page using JSON.\n * @ko 웹 페이지의 현재 상태를 JSON 형식으로 저장하거나 읽는다.\n * @alias eg.Persist\n *\n * @support {\"ie\": \"9+\", \"ch\" : \"latest\", \"ff\" : \"latest\",  \"sf\" : \"latest\" , \"edge\" : \"latest\", \"ios\" : \"7+\", \"an\" : \"2.3+ (except 3.x)\"}\n */\nclass Persist {\n\tstatic VERSION = \"#__VERSION__#\";\n\tstatic StorageManager = {\n\t\treset,\n\t\tsetStateByKey,\n\t\tgetStateByKey,\n\t\tgetStorage,\n\t};\n\t/**\n\t * @static\n\t * Clear all information in Persist\n\t */\n\tstatic clear() {\n\t\tclear();\n\t}\n\t/**\n\t * @static\n\t * Return whether you need \"Persist\" module by checking the bfCache support of the current browser\n\t * @return {Boolean}\n\t */\n\tstatic isNeeded() {\n\t\treturn isNeeded;\n\t}\n\t/**\n\t* Constructor\n\t* @param {String} key The key of the state information to be stored <ko>저장할 상태 정보의 키</ko>\n\t**/\n\tconstructor(key) {\n\t\tthis.key = key || \"\";\n\t}\n\n\t/**\n\t * Read value\n\t * @param {String?} path target path\n\t * @return {String|Number|Boolean|Object|Array}\n\t */\n\tget(path) {\n\t\t// update url for pushState, replaceState\n\t\tupdateDepth(TYPE_NAVIGATE);\n\n\t\t// find path\n\t\tconst urlKey = getStorageKey(getUrl());\n\t\tconst globalState =\tgetStateByKey(urlKey, this.key);\n\n\n\t\tif (!path || path.length === 0) {\n\t\t\treturn globalState;\n\t\t}\n\n\t\tconst pathToken = path.split(\".\");\n\n\t\tlet currentItem = globalState;\n\n\t\tlet isTargetExist = true;\n\n\t\tfor (let i = 0; i < pathToken.length; i++) {\n\t\t\tif (!currentItem) {\n\t\t\t\tisTargetExist = false;\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcurrentItem = currentItem[pathToken[i]];\n\t\t}\n\t\tif (!isTargetExist || currentItem == null) {\n\t\t\treturn null;\n\t\t}\n\t\treturn currentItem;\n\t}\n\t/**\n\t * Save value\n\t * @param {String} path target path\n\t * @param {String|Number|Boolean|Object|Array} value value to save\n\t * @return {Persist}\n\t */\n\tset(path, value) {\n\t\t// update url for pushState, replaceState\n\t\tupdateDepth(TYPE_NAVIGATE);\n\t\t// find path\n\t\tconst key = this.key;\n\t\tconst urlKey = getStorageKey(getUrl());\n\t\tconst globalState =\tgetStateByKey(urlKey, key);\n\n\t\ttry {\n\t\t\tif (path.length === 0) {\n\t\t\t\tsetStateByKey(urlKey, key, value);\n\t\t\t} else {\n\t\t\t\tconst allValue = execRec(globalState, path.split(\".\"), (obj, head) => {\n\t\t\t\t\tobj[head] = value;\n\t\t\t\t});\n\n\t\t\t\tsetStateByKey(\n\t\t\t\t\turlKey,\n\t\t\t\t\tkey,\n\t\t\t\t\tallValue\n\t\t\t\t);\n\t\t\t}\n\t\t} catch (e) {\n\t\t\tif (clearFirst(e)) {\n\t\t\t\tthis.set(path, value);\n\t\t\t} else {\n\t\t\t\t// There is no more size to fit in.\n\t\t\t\tthrow e;\n\t\t\t}\n\t\t}\n\t\treturn this;\n\t}\n\t/**\n\t * Remove value\n\t * @param {String} path target path\n\t * @return {Persist}\n\t */\n\tremove(path) {\n\t\t// update url for pushState, replaceState\n\t\tupdateDepth(TYPE_NAVIGATE);\n\n\t\t// find path\n\t\tconst key = this.key;\n\t\tconst urlKey = getStorageKey(getUrl());\n\t\tconst globalState =\tgetStateByKey(urlKey, key);\n\n\t\ttry {\n\t\t\tif (path.length === 0) {\n\t\t\t\tsetStateByKey(urlKey, key, null);\n\t\t\t} else {\n\t\t\t\tconst value = execRec(globalState, path.split(\".\"), (obj, head) => {\n\t\t\t\t\tif (typeof obj === \"object\") {\n\t\t\t\t\t\tdelete obj[head];\n\t\t\t\t\t}\n\t\t\t\t});\n\n\t\t\t\tsetStateByKey(\n\t\t\t\t\turlKey,\n\t\t\t\t\tkey,\n\t\t\t\t\tvalue\n\t\t\t\t);\n\t\t\t}\n\t\t} catch (e) {\n\t\t\tif (clearFirst(e)) {\n\t\t\t\tthis.remove(path);\n\t\t\t} else {\n\t\t\t\t// There is no more size to fit in.\n\t\t\t\tthrow e;\n\t\t\t}\n\t\t}\n\t\treturn this;\n\t}\n}\n\n// If navigation's type is not TYPE_BACK_FORWARD, delete information about current url.\nupdateDepth(getNavigationType());\n\nexport {\n\tupdateDepth,\n};\n\nexport default Persist;\n","import Persist, {updateDepth} from \"./Persist\";\n\n// eslint-disable-next-line import/no-named-as-default-member\nPersist.updateDepth = updateDepth;\n\nexport default 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\ No newline at end of file
diff --git a/package.json b/package.json
index 3b48c1d..ea35291 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "@egjs/persist",
-	"version": "2.3.0-snapshot",
+	"version": "2.4.0",
 	"description": "Provide cache interface to handle persisted data among history navigation.",
 	"main": "dist/persist.js",
 	"module": "dist/persist.esm.js",