diff --git a/.babelrc b/.babelrc
index a039539..b39f5a6 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,8 +1,7 @@
 {
   "presets": [
-    ["env", {
+    ["@babel/preset-env", {
       "modules": false
     }]
-  ],
-  "plugins": ["external-helpers"]
+  ]
 }
\ No newline at end of file
diff --git a/README.md b/README.md
index 4a4217e..7f4a54a 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ function isString (payload) {
   return getType(payload) === 'String'
 }
 function isNumber (payload) {
-  return getType(payload) === 'Number'
+  return (getType(payload) === 'Number' && !isNaN(payload))
 }
 function isBoolean (payload) {
   return getType(payload) === 'Boolean'
@@ -34,10 +34,12 @@ function isRegExp (payload) {
   return getType(payload) === 'RegExp'
 }
 function isDate (payload) {
-  return getType(payload) === 'Date'
+  return (getType(payload) === 'Date' &&  !isNaN(payload))
 }
 ```
 
+Since v2.0.0 it will return false on `isNumber()` and `isDate()` if the payload is `NaN` or an invalid date.
+
 ## Build from source
 
 ```bash
diff --git a/build/rollup.js b/build/rollup.js
index 9b2b9f9..af6db88 100644
--- a/build/rollup.js
+++ b/build/rollup.js
@@ -1,6 +1,34 @@
+/* eslint-disable */
+
+/* Required packages: */
+// npm i -D \
+// @babel/core \
+// @babel/plugin-proposal-object-rest-spread \
+// @babel/preset-env \
+// rollup \
+// rollup-plugin-babel@latest \
+// rollup-plugin-commonjs \
+// rollup-plugin-node-resolve \
+// rollup-plugin-terser \
+// is-what
+
+/* Required .babelrc setup: */
+// {
+//   "presets": [
+//     ["@babel/preset-env", {
+//       "modules": false
+//     }]
+//   ],
+//   "plugins": [
+//     "@babel/plugin-proposal-object-rest-spread"
+//   ]
+// }
+
 import babel from 'rollup-plugin-babel'
 import commonjs from 'rollup-plugin-commonjs'
 import { terser } from 'rollup-plugin-terser'
+import { isArray } from 'is-what'
+// import resolve from 'rollup-plugin-node-resolve'
 
 // ------------------------------------------------------------------------------------------
 // formats
@@ -13,50 +41,78 @@ import { terser } from 'rollup-plugin-terser'
 // ------------------------------------------------------------------------------------------
 // setup
 // ------------------------------------------------------------------------------------------
+const files = [
+  {in: 'src/index.js', out: 'dist', formats: ['cjs', 'es', 'iife', 'umd']},
+]
+const minify = true
+const sourcemap = true
+const plugins = [
+  babel({
+    exclude: 'node_modules/**' // only transpile our source code
+  }),
+  commonjs()
+]
+// ------------------------------------------------------------------------------------------
 const pkg = require('../package.json')
 const name = pkg.name
 const className = name.replace(/(^\w|-\w)/g, c => c.replace('-', '').toUpperCase())
 const external = Object.keys(pkg.dependencies || [])
-const _plugins = [
-  babel({
-    exclude: 'node_modules/**', // only transpile our source code
-  }),
-  commonjs(),
-]
 
 // ------------------------------------------------------------------------------------------
-// build helpers
+// Builds
 // ------------------------------------------------------------------------------------------
-function output (ext, format) {
+const nsNameExt = new RegExp('(.+)\/([^\/]+)\.([^\.]+$)', 'g')
+function getNS (name) {
+  if (!name.includes('/')) return ''
+  return name.replace(nsNameExt, '$1')
+}
+function getName (name) {
+  if (!name.includes('/')) name = 'a/' + name
+  name = name.replace(nsNameExt, '$2')
+  if (name.endsWith('.')) name = name.slice(0, -1)
+  return name
+}
+function getExt (name) {
+  return name.split('.').pop()
+}
+function getFileInfo (file) {
   return {
-    name: className,
-    sourcemap: true,
-    exports: 'named',
-    file: `dist/index.${ext}`,
-    format
+    ns:       getNS(file.in),
+    name:     getName(file.in),
+    ext:      getExt(file.in),
+    out:      file.out,
+    formats:  !isArray(file.formats) ? [file.formats] : file.formats,
+    plugins:  (file.plugins === undefined) ? plugins : file.plugins,
+    min:      (file.minify === undefined) ? minify : file.minify,
+    map:      (file.sourcemap === undefined) ? sourcemap : file.sourcemap,
+    external: external,
   }
 }
-function buildTemplate (format, minified = false) {
-  const plugins = (minified)
-    ? _plugins.concat(terser())
-    : _plugins
-  const ext = (minified)
-    ? `${format}.min.js`
-    : `${format}.js`
+function getRollupObject (info, format) {
   return {
-    input: `src/index.js`,
-    output: output(ext, format),
-    plugins,
-    external
+    input: `${info.ns}/${info.name}.${info.ext}`,
+    output: {
+      name: className,
+      sourcemap: info.map,
+      exports: 'named',
+      file: (!info.min)
+        ? `${info.out}/${info.name}.${format}.${info.ext}`
+        : `${info.out}/${info.name}.${format}.min.${info.ext}`,
+      format
+    },
+    plugins: (!info.min) ? plugins : plugins.concat(terser()),
+    external: info.external
   }
 }
+const builds = files.reduce((carry, file) => {
+  const info = getFileInfo(file)
+  const _builds = info.formats
+    .reduce((carry, format) => {
+      return carry
+        .concat(getRollupObject(info, format))
+    }, [])
 
-// ------------------------------------------------------------------------------------------
-// builds
-// ------------------------------------------------------------------------------------------
-const formats = ['umd', 'cjs', 'es', 'iife']
-const regBuilds = formats.map(format => buildTemplate(format))
-const minBuilds = formats.map(format => buildTemplate(format, true))
-const result = regBuilds.concat(minBuilds)
+  return carry.concat(_builds)
+}, [])
 
-export default result
+export default builds
diff --git a/dist/index.cjs.js b/dist/index.cjs.js
deleted file mode 100644
index 3186218..0000000
--- a/dist/index.cjs.js
+++ /dev/null
@@ -1,50 +0,0 @@
-'use strict';
-
-Object.defineProperty(exports, '__esModule', { value: true });
-
-function getType(payload) {
-  return Object.prototype.toString.call(payload).slice(8, -1);
-}
-function isUndefined(payload) {
-  return getType(payload) === 'Undefined';
-}
-function isNull(payload) {
-  return getType(payload) === 'Null';
-}
-function isObject(payload) {
-  return getType(payload) === 'Object';
-}
-function isFunction(payload) {
-  return getType(payload) === 'Function';
-}
-function isArray(payload) {
-  return getType(payload) === 'Array';
-}
-function isString(payload) {
-  return getType(payload) === 'String';
-}
-function isNumber(payload) {
-  return getType(payload) === 'Number';
-}
-function isBoolean(payload) {
-  return getType(payload) === 'Boolean';
-}
-function isRegExp(payload) {
-  return getType(payload) === 'RegExp';
-}
-function isDate(payload) {
-  return getType(payload) === 'Date';
-}
-
-exports.getType = getType;
-exports.isUndefined = isUndefined;
-exports.isNull = isNull;
-exports.isObject = isObject;
-exports.isFunction = isFunction;
-exports.isArray = isArray;
-exports.isString = isString;
-exports.isNumber = isNumber;
-exports.isBoolean = isBoolean;
-exports.isRegExp = isRegExp;
-exports.isDate = isDate;
-//# sourceMappingURL=index.cjs.js.map
diff --git a/dist/index.cjs.js.map b/dist/index.cjs.js.map
deleted file mode 100644
index 7cd21a1..0000000
--- a/dist/index.cjs.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"index.cjs.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return getType(payload) === 'Number'\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return getType(payload) === 'Date'\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice","isUndefined","isNull","isObject","isFunction","isArray","isString","isNumber","isBoolean","isRegExp","isDate"],"mappings":";;;;AACA,SAASA,OAAT,CAAkBC,OAAlB,EAA2B;SAClBC,OAAOC,SAAP,CAAiBC,QAAjB,CAA0BC,IAA1B,CAA+BJ,OAA/B,EAAwCK,KAAxC,CAA8C,CAA9C,EAAiD,CAAC,CAAlD,CAAP;;AAEF,SAASC,WAAT,CAAsBN,OAAtB,EAA+B;SACtBD,QAAQC,OAAR,MAAqB,WAA5B;;AAEF,SAASO,MAAT,CAAiBP,OAAjB,EAA0B;SACjBD,QAAQC,OAAR,MAAqB,MAA5B;;AAEF,SAASQ,QAAT,CAAmBR,OAAnB,EAA4B;SACnBD,QAAQC,OAAR,MAAqB,QAA5B;;AAEF,SAASS,UAAT,CAAqBT,OAArB,EAA8B;SACrBD,QAAQC,OAAR,MAAqB,UAA5B;;AAEF,SAASU,OAAT,CAAkBV,OAAlB,EAA2B;SAClBD,QAAQC,OAAR,MAAqB,OAA5B;;AAEF,SAASW,QAAT,CAAmBX,OAAnB,EAA4B;SACnBD,QAAQC,OAAR,MAAqB,QAA5B;;AAEF,SAASY,QAAT,CAAmBZ,OAAnB,EAA4B;SACnBD,QAAQC,OAAR,MAAqB,QAA5B;;AAEF,SAASa,SAAT,CAAoBb,OAApB,EAA6B;SACpBD,QAAQC,OAAR,MAAqB,SAA5B;;AAEF,SAASc,QAAT,CAAmBd,OAAnB,EAA4B;SACnBD,QAAQC,OAAR,MAAqB,QAA5B;;AAEF,SAASe,MAAT,CAAiBf,OAAjB,EAA0B;SACjBD,QAAQC,OAAR,MAAqB,MAA5B;;;;;;;;;;;;;;;"}
\ No newline at end of file
diff --git a/dist/index.cjs.min.js b/dist/index.cjs.min.js
index b88dafb..33782d3 100644
--- a/dist/index.cjs.min.js
+++ b/dist/index.cjs.min.js
@@ -1,2 +1,2 @@
-"use strict";function getType(e){return Object.prototype.toString.call(e).slice(8,-1)}function isUndefined(e){return"Undefined"===getType(e)}function isNull(e){return"Null"===getType(e)}function isObject(e){return"Object"===getType(e)}function isFunction(e){return"Function"===getType(e)}function isArray(e){return"Array"===getType(e)}function isString(e){return"String"===getType(e)}function isNumber(e){return"Number"===getType(e)}function isBoolean(e){return"Boolean"===getType(e)}function isRegExp(e){return"RegExp"===getType(e)}function isDate(e){return"Date"===getType(e)}Object.defineProperty(exports,"__esModule",{value:!0}),exports.getType=getType,exports.isUndefined=isUndefined,exports.isNull=isNull,exports.isObject=isObject,exports.isFunction=isFunction,exports.isArray=isArray,exports.isString=isString,exports.isNumber=isNumber,exports.isBoolean=isBoolean,exports.isRegExp=isRegExp,exports.isDate=isDate;
+"use strict";function getType(e){return Object.prototype.toString.call(e).slice(8,-1)}function isUndefined(e){return"Undefined"===getType(e)}function isNull(e){return"Null"===getType(e)}function isObject(e){return"Object"===getType(e)}function isFunction(e){return"Function"===getType(e)}function isArray(e){return"Array"===getType(e)}function isString(e){return"String"===getType(e)}function isNumber(e){return"Number"===getType(e)&&!isNaN(e)}function isBoolean(e){return"Boolean"===getType(e)}function isRegExp(e){return"RegExp"===getType(e)}function isDate(e){return"Date"===getType(e)&&!isNaN(e)}Object.defineProperty(exports,"__esModule",{value:!0}),exports.getType=getType,exports.isUndefined=isUndefined,exports.isNull=isNull,exports.isObject=isObject,exports.isFunction=isFunction,exports.isArray=isArray,exports.isString=isString,exports.isNumber=isNumber,exports.isBoolean=isBoolean,exports.isRegExp=isRegExp,exports.isDate=isDate;
 //# sourceMappingURL=index.cjs.min.js.map
diff --git a/dist/index.cjs.min.js.map b/dist/index.cjs.min.js.map
index 991986b..6290e4e 100644
--- a/dist/index.cjs.min.js.map
+++ b/dist/index.cjs.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"index.cjs.min.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return getType(payload) === 'Number'\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return getType(payload) === 'Date'\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice","isUndefined","isNull","isObject","isFunction","isArray","isString","isNumber","isBoolean","isRegExp","isDate"],"mappings":"aACA,SAASA,QAASC,UACTC,OAAOC,UAAUC,SAASC,KAAKJ,GAASK,MAAM,GAAI,GAE3D,SAASC,YAAaN,SACQ,cAArBD,QAAQC,GAEjB,SAASO,OAAQP,SACa,SAArBD,QAAQC,GAEjB,SAASQ,SAAUR,SACW,WAArBD,QAAQC,GAEjB,SAASS,WAAYT,SACS,aAArBD,QAAQC,GAEjB,SAASU,QAASV,SACY,UAArBD,QAAQC,GAEjB,SAASW,SAAUX,SACW,WAArBD,QAAQC,GAEjB,SAASY,SAAUZ,SACW,WAArBD,QAAQC,GAEjB,SAASa,UAAWb,SACU,YAArBD,QAAQC,GAEjB,SAASc,SAAUd,SACW,WAArBD,QAAQC,GAEjB,SAASe,OAAQf,SACa,SAArBD,QAAQC"}
\ No newline at end of file
+{"version":3,"file":"index.cjs.min.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return (getType(payload) === 'Number' && !isNaN(payload))\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return (getType(payload) === 'Date' &&  !isNaN(payload))\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice","isUndefined","isNull","isObject","isFunction","isArray","isString","isNumber","isNaN","isBoolean","isRegExp","isDate"],"mappings":"aACA,SAASA,QAASC,UACTC,OAAOC,UAAUC,SAASC,KAAKJ,GAASK,MAAM,GAAI,GAE3D,SAASC,YAAaN,SACQ,cAArBD,QAAQC,GAEjB,SAASO,OAAQP,SACa,SAArBD,QAAQC,GAEjB,SAASQ,SAAUR,SACW,WAArBD,QAAQC,GAEjB,SAASS,WAAYT,SACS,aAArBD,QAAQC,GAEjB,SAASU,QAASV,SACY,UAArBD,QAAQC,GAEjB,SAASW,SAAUX,SACW,WAArBD,QAAQC,GAEjB,SAASY,SAAUZ,SACY,WAArBD,QAAQC,KAA0Ba,MAAMb,GAElD,SAASc,UAAWd,SACU,YAArBD,QAAQC,GAEjB,SAASe,SAAUf,SACW,WAArBD,QAAQC,GAEjB,SAASgB,OAAQhB,SACc,SAArBD,QAAQC,KAAyBa,MAAMb"}
\ No newline at end of file
diff --git a/dist/index.es.js b/dist/index.es.js
deleted file mode 100644
index 1668e4b..0000000
--- a/dist/index.es.js
+++ /dev/null
@@ -1,36 +0,0 @@
-function getType(payload) {
-  return Object.prototype.toString.call(payload).slice(8, -1);
-}
-function isUndefined(payload) {
-  return getType(payload) === 'Undefined';
-}
-function isNull(payload) {
-  return getType(payload) === 'Null';
-}
-function isObject(payload) {
-  return getType(payload) === 'Object';
-}
-function isFunction(payload) {
-  return getType(payload) === 'Function';
-}
-function isArray(payload) {
-  return getType(payload) === 'Array';
-}
-function isString(payload) {
-  return getType(payload) === 'String';
-}
-function isNumber(payload) {
-  return getType(payload) === 'Number';
-}
-function isBoolean(payload) {
-  return getType(payload) === 'Boolean';
-}
-function isRegExp(payload) {
-  return getType(payload) === 'RegExp';
-}
-function isDate(payload) {
-  return getType(payload) === 'Date';
-}
-
-export { getType, isUndefined, isNull, isObject, isFunction, isArray, isString, isNumber, isBoolean, isRegExp, isDate };
-//# sourceMappingURL=index.es.js.map
diff --git a/dist/index.es.js.map b/dist/index.es.js.map
deleted file mode 100644
index fd5fbe1..0000000
--- a/dist/index.es.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"index.es.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return getType(payload) === 'Number'\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return getType(payload) === 'Date'\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice","isUndefined","isNull","isObject","isFunction","isArray","isString","isNumber","isBoolean","isRegExp","isDate"],"mappings":"AACA,SAASA,OAAT,CAAkBC,OAAlB,EAA2B;SAClBC,OAAOC,SAAP,CAAiBC,QAAjB,CAA0BC,IAA1B,CAA+BJ,OAA/B,EAAwCK,KAAxC,CAA8C,CAA9C,EAAiD,CAAC,CAAlD,CAAP;;AAEF,SAASC,WAAT,CAAsBN,OAAtB,EAA+B;SACtBD,QAAQC,OAAR,MAAqB,WAA5B;;AAEF,SAASO,MAAT,CAAiBP,OAAjB,EAA0B;SACjBD,QAAQC,OAAR,MAAqB,MAA5B;;AAEF,SAASQ,QAAT,CAAmBR,OAAnB,EAA4B;SACnBD,QAAQC,OAAR,MAAqB,QAA5B;;AAEF,SAASS,UAAT,CAAqBT,OAArB,EAA8B;SACrBD,QAAQC,OAAR,MAAqB,UAA5B;;AAEF,SAASU,OAAT,CAAkBV,OAAlB,EAA2B;SAClBD,QAAQC,OAAR,MAAqB,OAA5B;;AAEF,SAASW,QAAT,CAAmBX,OAAnB,EAA4B;SACnBD,QAAQC,OAAR,MAAqB,QAA5B;;AAEF,SAASY,QAAT,CAAmBZ,OAAnB,EAA4B;SACnBD,QAAQC,OAAR,MAAqB,QAA5B;;AAEF,SAASa,SAAT,CAAoBb,OAApB,EAA6B;SACpBD,QAAQC,OAAR,MAAqB,SAA5B;;AAEF,SAASc,QAAT,CAAmBd,OAAnB,EAA4B;SACnBD,QAAQC,OAAR,MAAqB,QAA5B;;AAEF,SAASe,MAAT,CAAiBf,OAAjB,EAA0B;SACjBD,QAAQC,OAAR,MAAqB,MAA5B;;;;;"}
\ No newline at end of file
diff --git a/dist/index.es.min.js b/dist/index.es.min.js
index 6026583..b1e1b2b 100644
--- a/dist/index.es.min.js
+++ b/dist/index.es.min.js
@@ -1,2 +1,2 @@
-function getType(e){return Object.prototype.toString.call(e).slice(8,-1)}function isUndefined(e){return"Undefined"===getType(e)}function isNull(e){return"Null"===getType(e)}function isObject(e){return"Object"===getType(e)}function isFunction(e){return"Function"===getType(e)}function isArray(e){return"Array"===getType(e)}function isString(e){return"String"===getType(e)}function isNumber(e){return"Number"===getType(e)}function isBoolean(e){return"Boolean"===getType(e)}function isRegExp(e){return"RegExp"===getType(e)}function isDate(e){return"Date"===getType(e)}export{getType,isUndefined,isNull,isObject,isFunction,isArray,isString,isNumber,isBoolean,isRegExp,isDate};
+function getType(e){return Object.prototype.toString.call(e).slice(8,-1)}function isUndefined(e){return"Undefined"===getType(e)}function isNull(e){return"Null"===getType(e)}function isObject(e){return"Object"===getType(e)}function isFunction(e){return"Function"===getType(e)}function isArray(e){return"Array"===getType(e)}function isString(e){return"String"===getType(e)}function isNumber(e){return"Number"===getType(e)&&!isNaN(e)}function isBoolean(e){return"Boolean"===getType(e)}function isRegExp(e){return"RegExp"===getType(e)}function isDate(e){return"Date"===getType(e)&&!isNaN(e)}export{getType,isUndefined,isNull,isObject,isFunction,isArray,isString,isNumber,isBoolean,isRegExp,isDate};
 //# sourceMappingURL=index.es.min.js.map
diff --git a/dist/index.es.min.js.map b/dist/index.es.min.js.map
index 5d330f6..659475f 100644
--- a/dist/index.es.min.js.map
+++ b/dist/index.es.min.js.map
@@ -1 +1 @@
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+{"version":3,"file":"index.es.min.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return (getType(payload) === 'Number' && !isNaN(payload))\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return (getType(payload) === 'Date' &&  !isNaN(payload))\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice","isUndefined","isNull","isObject","isFunction","isArray","isString","isNumber","isNaN","isBoolean","isRegExp","isDate"],"mappings":"AACA,SAASA,QAASC,UACTC,OAAOC,UAAUC,SAASC,KAAKJ,GAASK,MAAM,GAAI,GAE3D,SAASC,YAAaN,SACQ,cAArBD,QAAQC,GAEjB,SAASO,OAAQP,SACa,SAArBD,QAAQC,GAEjB,SAASQ,SAAUR,SACW,WAArBD,QAAQC,GAEjB,SAASS,WAAYT,SACS,aAArBD,QAAQC,GAEjB,SAASU,QAASV,SACY,UAArBD,QAAQC,GAEjB,SAASW,SAAUX,SACW,WAArBD,QAAQC,GAEjB,SAASY,SAAUZ,SACY,WAArBD,QAAQC,KAA0Ba,MAAMb,GAElD,SAASc,UAAWd,SACU,YAArBD,QAAQC,GAEjB,SAASe,SAAUf,SACW,WAArBD,QAAQC,GAEjB,SAASgB,OAAQhB,SACc,SAArBD,QAAQC,KAAyBa,MAAMb"}
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diff --git a/dist/index.iife.js b/dist/index.iife.js
deleted file mode 100644
index c819fd0..0000000
--- a/dist/index.iife.js
+++ /dev/null
@@ -1,53 +0,0 @@
-var IsWhat = (function (exports) {
-  'use strict';
-
-  function getType(payload) {
-    return Object.prototype.toString.call(payload).slice(8, -1);
-  }
-  function isUndefined(payload) {
-    return getType(payload) === 'Undefined';
-  }
-  function isNull(payload) {
-    return getType(payload) === 'Null';
-  }
-  function isObject(payload) {
-    return getType(payload) === 'Object';
-  }
-  function isFunction(payload) {
-    return getType(payload) === 'Function';
-  }
-  function isArray(payload) {
-    return getType(payload) === 'Array';
-  }
-  function isString(payload) {
-    return getType(payload) === 'String';
-  }
-  function isNumber(payload) {
-    return getType(payload) === 'Number';
-  }
-  function isBoolean(payload) {
-    return getType(payload) === 'Boolean';
-  }
-  function isRegExp(payload) {
-    return getType(payload) === 'RegExp';
-  }
-  function isDate(payload) {
-    return getType(payload) === 'Date';
-  }
-
-  exports.getType = getType;
-  exports.isUndefined = isUndefined;
-  exports.isNull = isNull;
-  exports.isObject = isObject;
-  exports.isFunction = isFunction;
-  exports.isArray = isArray;
-  exports.isString = isString;
-  exports.isNumber = isNumber;
-  exports.isBoolean = isBoolean;
-  exports.isRegExp = isRegExp;
-  exports.isDate = isDate;
-
-  return exports;
-
-}({}));
-//# sourceMappingURL=index.iife.js.map
diff --git a/dist/index.iife.js.map b/dist/index.iife.js.map
deleted file mode 100644
index 8f1ca0c..0000000
--- a/dist/index.iife.js.map
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/dist/index.iife.min.js b/dist/index.iife.min.js
index 87a3cab..b26d402 100644
--- a/dist/index.iife.min.js
+++ b/dist/index.iife.min.js
@@ -1,2 +1,2 @@
-var IsWhat=function(n){"use strict";function t(n){return Object.prototype.toString.call(n).slice(8,-1)}return n.getType=t,n.isUndefined=function(n){return"Undefined"===t(n)},n.isNull=function(n){return"Null"===t(n)},n.isObject=function(n){return"Object"===t(n)},n.isFunction=function(n){return"Function"===t(n)},n.isArray=function(n){return"Array"===t(n)},n.isString=function(n){return"String"===t(n)},n.isNumber=function(n){return"Number"===t(n)},n.isBoolean=function(n){return"Boolean"===t(n)},n.isRegExp=function(n){return"RegExp"===t(n)},n.isDate=function(n){return"Date"===t(n)},n}({});
+var IsWhat=function(n){"use strict";function t(n){return Object.prototype.toString.call(n).slice(8,-1)}return n.getType=t,n.isUndefined=function(n){return"Undefined"===t(n)},n.isNull=function(n){return"Null"===t(n)},n.isObject=function(n){return"Object"===t(n)},n.isFunction=function(n){return"Function"===t(n)},n.isArray=function(n){return"Array"===t(n)},n.isString=function(n){return"String"===t(n)},n.isNumber=function(n){return"Number"===t(n)&&!isNaN(n)},n.isBoolean=function(n){return"Boolean"===t(n)},n.isRegExp=function(n){return"RegExp"===t(n)},n.isDate=function(n){return"Date"===t(n)&&!isNaN(n)},n}({});
 //# sourceMappingURL=index.iife.min.js.map
diff --git a/dist/index.iife.min.js.map b/dist/index.iife.min.js.map
index b0885f7..cbe5378 100644
--- a/dist/index.iife.min.js.map
+++ b/dist/index.iife.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"index.iife.min.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return getType(payload) === 'Number'\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return getType(payload) === 'Date'\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice"],"mappings":"oCACA,SAASA,EAASC,UACTC,OAAOC,UAAUC,SAASC,KAAKJ,GAASK,MAAM,GAAI,oCAE3D,SAAsBL,SACQ,cAArBD,EAAQC,aAEjB,SAAiBA,SACa,SAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,iBAEjB,SAAqBA,SACS,aAArBD,EAAQC,cAEjB,SAAkBA,SACY,UAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,gBAEjB,SAAoBA,SACU,YAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,aAEjB,SAAiBA,SACa,SAArBD,EAAQC"}
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+{"version":3,"file":"index.iife.min.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return (getType(payload) === 'Number' && !isNaN(payload))\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return (getType(payload) === 'Date' &&  !isNaN(payload))\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice","isNaN"],"mappings":"oCACA,SAASA,EAASC,UACTC,OAAOC,UAAUC,SAASC,KAAKJ,GAASK,MAAM,GAAI,oCAE3D,SAAsBL,SACQ,cAArBD,EAAQC,aAEjB,SAAiBA,SACa,SAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,iBAEjB,SAAqBA,SACS,aAArBD,EAAQC,cAEjB,SAAkBA,SACY,UAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,eAEjB,SAAmBA,SACY,WAArBD,EAAQC,KAA0BM,MAAMN,gBAElD,SAAoBA,SACU,YAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,aAEjB,SAAiBA,SACc,SAArBD,EAAQC,KAAyBM,MAAMN"}
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diff --git a/dist/index.umd.js b/dist/index.umd.js
deleted file mode 100644
index e0ade84..0000000
--- a/dist/index.umd.js
+++ /dev/null
@@ -1,56 +0,0 @@
-(function (global, factory) {
-  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
-  typeof define === 'function' && define.amd ? define(['exports'], factory) :
-  (factory((global.IsWhat = {})));
-}(this, (function (exports) { 'use strict';
-
-  function getType(payload) {
-    return Object.prototype.toString.call(payload).slice(8, -1);
-  }
-  function isUndefined(payload) {
-    return getType(payload) === 'Undefined';
-  }
-  function isNull(payload) {
-    return getType(payload) === 'Null';
-  }
-  function isObject(payload) {
-    return getType(payload) === 'Object';
-  }
-  function isFunction(payload) {
-    return getType(payload) === 'Function';
-  }
-  function isArray(payload) {
-    return getType(payload) === 'Array';
-  }
-  function isString(payload) {
-    return getType(payload) === 'String';
-  }
-  function isNumber(payload) {
-    return getType(payload) === 'Number';
-  }
-  function isBoolean(payload) {
-    return getType(payload) === 'Boolean';
-  }
-  function isRegExp(payload) {
-    return getType(payload) === 'RegExp';
-  }
-  function isDate(payload) {
-    return getType(payload) === 'Date';
-  }
-
-  exports.getType = getType;
-  exports.isUndefined = isUndefined;
-  exports.isNull = isNull;
-  exports.isObject = isObject;
-  exports.isFunction = isFunction;
-  exports.isArray = isArray;
-  exports.isString = isString;
-  exports.isNumber = isNumber;
-  exports.isBoolean = isBoolean;
-  exports.isRegExp = isRegExp;
-  exports.isDate = isDate;
-
-  Object.defineProperty(exports, '__esModule', { value: true });
-
-})));
-//# sourceMappingURL=index.umd.js.map
diff --git a/dist/index.umd.js.map b/dist/index.umd.js.map
deleted file mode 100644
index 99512e1..0000000
--- a/dist/index.umd.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"index.umd.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return getType(payload) === 'Number'\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return getType(payload) === 'Date'\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice","isUndefined","isNull","isObject","isFunction","isArray","isString","isNumber","isBoolean","isRegExp","isDate"],"mappings":";;;;;;EACA,SAASA,OAAT,CAAkBC,OAAlB,EAA2B;EACzB,SAAOC,OAAOC,SAAP,CAAiBC,QAAjB,CAA0BC,IAA1B,CAA+BJ,OAA/B,EAAwCK,KAAxC,CAA8C,CAA9C,EAAiD,CAAC,CAAlD,CAAP;EACD;EACD,SAASC,WAAT,CAAsBN,OAAtB,EAA+B;EAC7B,SAAOD,QAAQC,OAAR,MAAqB,WAA5B;EACD;EACD,SAASO,MAAT,CAAiBP,OAAjB,EAA0B;EACxB,SAAOD,QAAQC,OAAR,MAAqB,MAA5B;EACD;EACD,SAASQ,QAAT,CAAmBR,OAAnB,EAA4B;EAC1B,SAAOD,QAAQC,OAAR,MAAqB,QAA5B;EACD;EACD,SAASS,UAAT,CAAqBT,OAArB,EAA8B;EAC5B,SAAOD,QAAQC,OAAR,MAAqB,UAA5B;EACD;EACD,SAASU,OAAT,CAAkBV,OAAlB,EAA2B;EACzB,SAAOD,QAAQC,OAAR,MAAqB,OAA5B;EACD;EACD,SAASW,QAAT,CAAmBX,OAAnB,EAA4B;EAC1B,SAAOD,QAAQC,OAAR,MAAqB,QAA5B;EACD;EACD,SAASY,QAAT,CAAmBZ,OAAnB,EAA4B;EAC1B,SAAOD,QAAQC,OAAR,MAAqB,QAA5B;EACD;EACD,SAASa,SAAT,CAAoBb,OAApB,EAA6B;EAC3B,SAAOD,QAAQC,OAAR,MAAqB,SAA5B;EACD;EACD,SAASc,QAAT,CAAmBd,OAAnB,EAA4B;EAC1B,SAAOD,QAAQC,OAAR,MAAqB,QAA5B;EACD;EACD,SAASe,MAAT,CAAiBf,OAAjB,EAA0B;EACxB,SAAOD,QAAQC,OAAR,MAAqB,MAA5B;EACD;;;;;;;;;;;;;;;;;;;;;;"}
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diff --git a/dist/index.umd.min.js b/dist/index.umd.min.js
index f523d85..6d52bb4 100644
--- a/dist/index.umd.min.js
+++ b/dist/index.umd.min.js
@@ -1,2 +1,2 @@
-!function(n,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e(n.IsWhat={})}(this,function(n){"use strict";function e(n){return Object.prototype.toString.call(n).slice(8,-1)}n.getType=e,n.isUndefined=function(n){return"Undefined"===e(n)},n.isNull=function(n){return"Null"===e(n)},n.isObject=function(n){return"Object"===e(n)},n.isFunction=function(n){return"Function"===e(n)},n.isArray=function(n){return"Array"===e(n)},n.isString=function(n){return"String"===e(n)},n.isNumber=function(n){return"Number"===e(n)},n.isBoolean=function(n){return"Boolean"===e(n)},n.isRegExp=function(n){return"RegExp"===e(n)},n.isDate=function(n){return"Date"===e(n)},Object.defineProperty(n,"__esModule",{value:!0})});
+!function(n,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e(n.IsWhat={})}(this,function(n){"use strict";function e(n){return Object.prototype.toString.call(n).slice(8,-1)}n.getType=e,n.isUndefined=function(n){return"Undefined"===e(n)},n.isNull=function(n){return"Null"===e(n)},n.isObject=function(n){return"Object"===e(n)},n.isFunction=function(n){return"Function"===e(n)},n.isArray=function(n){return"Array"===e(n)},n.isString=function(n){return"String"===e(n)},n.isNumber=function(n){return"Number"===e(n)&&!isNaN(n)},n.isBoolean=function(n){return"Boolean"===e(n)},n.isRegExp=function(n){return"RegExp"===e(n)},n.isDate=function(n){return"Date"===e(n)&&!isNaN(n)},Object.defineProperty(n,"__esModule",{value:!0})});
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diff --git a/dist/index.umd.min.js.map b/dist/index.umd.min.js.map
index ce9e72c..7592aae 100644
--- a/dist/index.umd.min.js.map
+++ b/dist/index.umd.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"index.umd.min.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return getType(payload) === 'Number'\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return getType(payload) === 'Date'\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice"],"mappings":"yLACA,SAASA,EAASC,UACTC,OAAOC,UAAUC,SAASC,KAAKJ,GAASK,MAAM,GAAI,6BAE3D,SAAsBL,SACQ,cAArBD,EAAQC,aAEjB,SAAiBA,SACa,SAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,iBAEjB,SAAqBA,SACS,aAArBD,EAAQC,cAEjB,SAAkBA,SACY,UAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,gBAEjB,SAAoBA,SACU,YAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,aAEjB,SAAiBA,SACa,SAArBD,EAAQC"}
\ No newline at end of file
+{"version":3,"file":"index.umd.min.js","sources":["../src/index.js"],"sourcesContent":["\nfunction getType (payload) {\n  return Object.prototype.toString.call(payload).slice(8, -1)\n}\nfunction isUndefined (payload) {\n  return getType(payload) === 'Undefined'\n}\nfunction isNull (payload) {\n  return getType(payload) === 'Null'\n}\nfunction isObject (payload) {\n  return getType(payload) === 'Object'\n}\nfunction isFunction (payload) {\n  return getType(payload) === 'Function'\n}\nfunction isArray (payload) {\n  return getType(payload) === 'Array'\n}\nfunction isString (payload) {\n  return getType(payload) === 'String'\n}\nfunction isNumber (payload) {\n  return (getType(payload) === 'Number' && !isNaN(payload))\n}\nfunction isBoolean (payload) {\n  return getType(payload) === 'Boolean'\n}\nfunction isRegExp (payload) {\n  return getType(payload) === 'RegExp'\n}\nfunction isDate (payload) {\n  return (getType(payload) === 'Date' &&  !isNaN(payload))\n}\n\nexport {\n  getType,\n  isUndefined,\n  isNull,\n  isObject,\n  isFunction,\n  isArray,\n  isString,\n  isNumber,\n  isBoolean,\n  isRegExp,\n  isDate\n}\n"],"names":["getType","payload","Object","prototype","toString","call","slice","isNaN"],"mappings":"yLACA,SAASA,EAASC,UACTC,OAAOC,UAAUC,SAASC,KAAKJ,GAASK,MAAM,GAAI,6BAE3D,SAAsBL,SACQ,cAArBD,EAAQC,aAEjB,SAAiBA,SACa,SAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,iBAEjB,SAAqBA,SACS,aAArBD,EAAQC,cAEjB,SAAkBA,SACY,UAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,eAEjB,SAAmBA,SACY,WAArBD,EAAQC,KAA0BM,MAAMN,gBAElD,SAAoBA,SACU,YAArBD,EAAQC,eAEjB,SAAmBA,SACW,WAArBD,EAAQC,aAEjB,SAAiBA,SACc,SAArBD,EAAQC,KAAyBM,MAAMN"}
\ No newline at end of file
diff --git a/package.json b/package.json
index 9463985..92e2249 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "is-what",
-  "version": "1.1.0",
+  "version": "2.0.0",
   "description": "Very simple & small JS type check function",
   "main": "dist/index.cjs.min.js",
   "module": "dist/index.es.min.js",
@@ -24,12 +24,13 @@
   },
   "homepage": "https://github.com/mesqueeb/isWhat#readme",
   "devDependencies": {
-    "babel-core": "^6.26.3",
-    "babel-plugin-external-helpers": "^6.22.0",
-    "babel-preset-env": "^1.7.0",
-    "rollup": "^0.60.7",
-    "rollup-plugin-babel": "^3.0.4",
-    "rollup-plugin-commonjs": "^9.1.3",
-    "rollup-plugin-terser": "^1.0.1"
-  }
+    "@babel/core": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "rollup": "^0.65.2",
+    "rollup-plugin-babel": "^4.0.3",
+    "rollup-plugin-commonjs": "^9.1.6",
+    "rollup-plugin-node-resolve": "^3.4.0",
+    "rollup-plugin-terser": "^2.0.2"
+  },
+  "dependencies": {}
 }
diff --git a/src/index.js b/src/index.js
index 4c86695..b4520fc 100644
--- a/src/index.js
+++ b/src/index.js
@@ -21,7 +21,7 @@ function isString (payload) {
   return getType(payload) === 'String'
 }
 function isNumber (payload) {
-  return getType(payload) === 'Number'
+  return (getType(payload) === 'Number' && !isNaN(payload))
 }
 function isBoolean (payload) {
   return getType(payload) === 'Boolean'
@@ -30,7 +30,7 @@ function isRegExp (payload) {
   return getType(payload) === 'RegExp'
 }
 function isDate (payload) {
-  return getType(payload) === 'Date'
+  return (getType(payload) === 'Date' &&  !isNaN(payload))
 }
 
 export {