diff --git a/README.md b/README.md
index 7518b56..cb1b627 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,13 @@
 [![Coverage Status](https://coveralls.io/repos/github/john-ko/dynamic-script-loader/badge.svg?branch=master)](https://coveralls.io/github/john-ko/dynamic-script-loader?branch=master)
 [![Build Status](https://travis-ci.org/john-ko/dynamic-script-loader.svg?branch=master)](https://travis-ci.org/john-ko/dynamic-script-loader)
 
-
 # Script Loader
 A script loader for modular components in es6 (build process coming soon). This is built so that each components being responsible for what 3rd party dependencies they need.
-- if script has not been loaded, it will load  the script, run the one time setup callback, then execute the `then`
-- if a script has already been loaded, it will execute the `then`
+- if script has not been loaded, it will load  the script, and return a promise
+- `onLoadHandler` and `onErrorHandler` will execute on script load and on script error
+- script promise will be resolved when the script is loaded, rejects if it errors
+- if a script has already been requested to load throught dynamic script loader, it will return the existing promise
+- all script proimses are added to `window.dynamicScriptLoader` global object
 
 # Install
 `npm i -S dynamic-script-loader`
@@ -14,21 +16,16 @@ A script loader for modular components in es6 (build process coming soon). This
 simple
 
 ```
-const ScriptLoader = require('dynamic-script-loader')
-const script = new ScriptLoader()
-
-script.load({
-  src: '//path/to/someExternalJS.js',
-  async: true,  // default to true, you can leave this out
-}), function oneTimeSetUp () {
-  // window.someExternalJS setup here
-})
-  .then(function externalJSSuccessResolver () {
-    // this runs after one time setup
-  })
-  .catch(function scriptDidntLoad () {
-    console.log(':(')
-  })
+const scriptLoader = require('dynamic-script-loader')
+
+scriptLoader({
+    src: ''//path/to/someExternalJS.js'
+  },
+  onLoadHandler, // optional
+  onErrorHandler // optional
+  )
+  .then(resolverFunction)
+  .catch(catchFunction)
 ```
 
 ## Vue
@@ -38,12 +35,11 @@ heres a couple of ways you can use the script loader
 
 ### using it as a method
 ```
-import DynamicScriptLoader from 'dynamic-script-loader'
+import scriptLoader from 'dynamic-script-loader'
 
 Vue.use({
   install: function (Vue, options) {
-    Vue.prototype.$script = new DynamicScriptLoader()
-  }
+    Vue.prototype.$scriptLoader = scriptLoader
 })
 
 // inside a Vue component
@@ -56,7 +52,7 @@ data () {
 
 mounted () {
   // the loader will not load libraries if they have already been loaded
-  this.$script.load({
+  this.$scriptLoader({
     src: '//some-cdn/src/js/library.js',
     async: true
   }, () => {
diff --git a/package-lock.json b/package-lock.json
index 6d0768b..5faeef4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "dynamic-script-loader",
-  "version": "1.0.0-alpha.1",
+  "version": "1.0.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -876,6 +876,12 @@
         "uri-js": "^4.2.2"
       }
     },
+    "ansi-regex": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "dev": true
+    },
     "ansi-styles": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
@@ -908,6 +914,21 @@
         }
       }
     },
+    "append-transform": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
+      "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
+      "dev": true,
+      "requires": {
+        "default-require-extensions": "^2.0.0"
+      }
+    },
+    "archy": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
+      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
+      "dev": true
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -921,19 +942,22 @@
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
       "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "arr-flatten": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
       "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "arr-union": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "array-equal": {
       "version": "1.0.0",
@@ -951,7 +975,8 @@
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
       "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "asn1": {
       "version": "0.2.4",
@@ -978,7 +1003,8 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "async-each": {
       "version": "1.0.1",
@@ -997,7 +1023,8 @@
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
       "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "aws-sign2": {
       "version": "0.7.0",
@@ -1022,6 +1049,7 @@
       "resolved": "https://registry.npmjs.org/base/-/base-0.11.2.tgz",
       "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
       "dev": true,
+      "optional": true,
       "requires": {
         "cache-base": "^1.0.1",
         "class-utils": "^0.3.5",
@@ -1037,6 +1065,7 @@
           "resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz",
           "integrity": "sha1-dp66rz9KY6rTr56NMEybvnm/sOY=",
           "dev": true,
+          "optional": true,
           "requires": {
             "is-descriptor": "^1.0.0"
           }
@@ -1046,6 +1075,7 @@
           "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
           "integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==",
           "dev": true,
+          "optional": true,
           "requires": {
             "kind-of": "^6.0.0"
           }
@@ -1055,6 +1085,7 @@
           "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
           "integrity": "sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==",
           "dev": true,
+          "optional": true,
           "requires": {
             "kind-of": "^6.0.0"
           }
@@ -1064,6 +1095,7 @@
           "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-1.0.2.tgz",
           "integrity": "sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==",
           "dev": true,
+          "optional": true,
           "requires": {
             "is-accessor-descriptor": "^1.0.0",
             "is-data-descriptor": "^1.0.0",
@@ -1103,6 +1135,7 @@
       "resolved": "https://registry.npmjs.org/braces/-/braces-2.3.2.tgz",
       "integrity": "sha512-aNdbnj9P8PjdXU4ybaWLK2IF3jc/EoDYbC7AazW6to3TRsfXxscC9UXOB5iDiEQrkyIbWp2SLQda4+QAa7nc3w==",
       "dev": true,
+      "optional": true,
       "requires": {
         "arr-flatten": "^1.1.0",
         "array-unique": "^0.3.2",
@@ -1121,6 +1154,7 @@
           "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
           "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
           "dev": true,
+          "optional": true,
           "requires": {
             "is-extendable": "^0.1.0"
           }
@@ -1155,6 +1189,7 @@
       "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
       "integrity": "sha512-AKcdTnFSWATd5/GCPRxr2ChwIJ85CeyrEyjRHlKxQ56d4XJMGym0uAiKn0xbLOGOl3+yRpOTi484dVCEc5AUzQ==",
       "dev": true,
+      "optional": true,
       "requires": {
         "collection-visit": "^1.0.0",
         "component-emitter": "^1.2.1",
@@ -1167,6 +1202,42 @@
         "unset-value": "^1.0.0"
       }
     },
+    "caching-transform": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/caching-transform/-/caching-transform-3.0.2.tgz",
+      "integrity": "sha512-Mtgcv3lh3U0zRii/6qVgQODdPA4G3zhG+jtbCWj39RXuUFTMzH0vcdMtaJS1jPowd+It2Pqr6y3NJMQqOqCE2w==",
+      "dev": true,
+      "requires": {
+        "hasha": "^3.0.0",
+        "make-dir": "^2.0.0",
+        "package-hash": "^3.0.0",
+        "write-file-atomic": "^2.4.2"
+      },
+      "dependencies": {
+        "make-dir": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
+          "integrity": "sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==",
+          "dev": true,
+          "requires": {
+            "pify": "^4.0.1",
+            "semver": "^5.6.0"
+          }
+        },
+        "pify": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
+          "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
+          "dev": true
+        }
+      }
+    },
+    "camelcase": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+      "dev": true
+    },
     "caniuse-lite": {
       "version": "1.0.30000938",
       "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000938.tgz",
@@ -1197,6 +1268,7 @@
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/chai-as-promised/-/chai-as-promised-7.1.1.tgz",
       "integrity": "sha512-azL6xMoi+uxu6z4rhWQ1jbdUhOMhis2PvscD/xjLqNMkv3BPPp2JyyuTHOrf9BOosGpNQ11v6BKv/g57RXbiaA==",
+      "dev": true,
       "requires": {
         "check-error": "^1.0.2"
       }
@@ -1215,7 +1287,8 @@
     "check-error": {
       "version": "1.0.2",
       "resolved": "http://npm.ehowcdn.com:4873/check-error/-/check-error-1.0.2.tgz",
-      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII="
+      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
+      "dev": true
     },
     "chokidar": {
       "version": "2.1.1",
@@ -1243,6 +1316,7 @@
       "resolved": "https://registry.npmjs.org/class-utils/-/class-utils-0.3.6.tgz",
       "integrity": "sha512-qOhPa/Fj7s6TY8H8esGu5QNpMMQxz79h+urzrNYN6mn+9BnxlDGf5QZ+XeCDsxSjPqsSR56XOZOJmpeurnLMeg==",
       "dev": true,
+      "optional": true,
       "requires": {
         "arr-union": "^3.1.0",
         "define-property": "^0.2.5",
@@ -1255,17 +1329,30 @@
           "resolved": "https://registry.npmjs.org/define-property/-/define-property-0.2.5.tgz",
           "integrity": "sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=",
           "dev": true,
+          "optional": true,
           "requires": {
             "is-descriptor": "^0.1.0"
           }
         }
       }
     },
+    "cliui": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
+      "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
+      "dev": true,
+      "requires": {
+        "string-width": "^3.1.0",
+        "strip-ansi": "^5.2.0",
+        "wrap-ansi": "^5.1.0"
+      }
+    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
       "integrity": "sha1-S8A3PBZLwykbTTaMgpzxqApZ3KA=",
       "dev": true,
+      "optional": true,
       "requires": {
         "map-visit": "^1.0.0",
         "object-visit": "^1.0.0"
@@ -1311,7 +1398,8 @@
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.2.1.tgz",
       "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "concat-map": {
       "version": "0.0.1",
@@ -1338,7 +1426,8 @@
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/copy-descriptor/-/copy-descriptor-0.1.1.tgz",
       "integrity": "sha1-Z29us8OZl8LuGsOpJP1hJHSPV40=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "core-js": {
       "version": "2.6.5",
@@ -1374,6 +1463,47 @@
         }
       }
     },
+    "cp-file": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/cp-file/-/cp-file-6.2.0.tgz",
+      "integrity": "sha512-fmvV4caBnofhPe8kOcitBwSn2f39QLjnAnGq3gO9dfd75mUytzKNZB1hde6QHunW2Rt+OwuBOMc3i1tNElbszA==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.2",
+        "make-dir": "^2.0.0",
+        "nested-error-stacks": "^2.0.0",
+        "pify": "^4.0.1",
+        "safe-buffer": "^5.0.1"
+      },
+      "dependencies": {
+        "make-dir": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
+          "integrity": "sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==",
+          "dev": true,
+          "requires": {
+            "pify": "^4.0.1",
+            "semver": "^5.6.0"
+          }
+        },
+        "pify": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
+          "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
+          "dev": true
+        }
+      }
+    },
+    "cross-spawn": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-4.0.2.tgz",
+      "integrity": "sha1-e5JHYhwjrf3ThWAEqCPL45dCTUE=",
+      "dev": true,
+      "requires": {
+        "lru-cache": "^4.0.1",
+        "which": "^1.2.9"
+      }
+    },
     "cssom": {
       "version": "0.3.6",
       "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.6.tgz",
@@ -1403,15 +1533,23 @@
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
       "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
       "dev": true,
+      "optional": true,
       "requires": {
         "ms": "2.0.0"
       }
     },
+    "decamelize": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+      "dev": true
+    },
     "decode-uri-component": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
       "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "deep-eql": {
       "version": "3.0.1",
@@ -1428,11 +1566,21 @@
       "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
       "dev": true
     },
+    "default-require-extensions": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/default-require-extensions/-/default-require-extensions-2.0.0.tgz",
+      "integrity": "sha1-9fj7sYp9bVCyH2QfZJ67Uiz+JPc=",
+      "dev": true,
+      "requires": {
+        "strip-bom": "^3.0.0"
+      }
+    },
     "define-property": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/define-property/-/define-property-2.0.2.tgz",
       "integrity": "sha512-jwK2UV4cnPpbcG7+VRARKTZPUWowwXA8bzH5NP6ud0oeAxyYPuGZUAC7hMugpCdz4BeSZl2Dl9k66CHJ/46ZYQ==",
       "dev": true,
+      "optional": true,
       "requires": {
         "is-descriptor": "^1.0.2",
         "isobject": "^3.0.1"
@@ -1443,6 +1591,7 @@
           "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
           "integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==",
           "dev": true,
+          "optional": true,
           "requires": {
             "kind-of": "^6.0.0"
           }
@@ -1452,6 +1601,7 @@
           "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
           "integrity": "sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==",
           "dev": true,
+          "optional": true,
           "requires": {
             "kind-of": "^6.0.0"
           }
@@ -1461,6 +1611,7 @@
           "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-1.0.2.tgz",
           "integrity": "sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==",
           "dev": true,
+          "optional": true,
           "requires": {
             "is-accessor-descriptor": "^1.0.0",
             "is-data-descriptor": "^1.0.0",
@@ -1497,6 +1648,36 @@
       "integrity": "sha512-De+lPAxEcpxvqPTyZAXELNpRZXABRxf+uL/rSykstQhzj/B0l1150G/ExIIxKc16lI89Hgz81J0BHAcbTqK49g==",
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+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "dev": true
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
+    "wrap-ansi": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+      "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^3.2.0",
+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0"
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "http://npm.ehowcdn.com:4873/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
+    "write-file-atomic": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.3.tgz",
+      "integrity": "sha512-GaETH5wwsX+GcnzhPgKcKjJ6M2Cq3/iZp1WyY/X1CSqrW+jVNM9Y7D8EC2sM4ZG/V8wZlSniJnCKWPmBYAucRQ==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
     "xml-name-validator": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-2.0.1.tgz",
       "integrity": "sha1-TYuPHszTQZqjYgYb7O9RXh5VljU=",
       "dev": true
+    },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    },
+    "yargs": {
+      "version": "13.2.4",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz",
+      "integrity": "sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==",
+      "dev": true,
+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "os-locale": "^3.1.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.1.0"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.0.tgz",
+          "integrity": "sha512-pZbTJpoUsCzV48Mc9Nh51VbwO0X9cuPFE8gYwx9BTCt9SF8/b7Zljd2fVgOxhIF/HDTKgpVzs+GPhyKfjLLFRQ==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "p-try": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+          "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
+          "dev": true
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
+      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 39f906c..b2789f2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "dynamic-script-loader",
-  "version": "1.0.0-alpha.1",
+  "version": "1.0.1",
   "description": "script loader for module components",
   "main": "src/index.js",
   "scripts": {
@@ -8,8 +8,6 @@
     "preversion": "npm test",
     "postversion": "git push && git push --tags",
     "test": "nyc --reporter=text --reporter=lcov mocha --require @babel/register tests/**/*.spec.js",
-    "test:e2e": "./node_modules/.bin/karma start karma.conf.js --single-run",
-    "test:unit": "./node_modules/.bin/nyc --reporter=text --reporter=lcov ./node_modules/.bin/mocha test/unit --require babel-core/register"
   },
   "repository": {
     "type": "git",
@@ -22,7 +20,7 @@
   },
   "homepage": "https://github.com/john-ko/dynamic-script-loader#readme",
   "dependencies": {
-    "chai-as-promised": "^7.1.1"
+    "lodash": ">=4.17.13"
   },
   "devDependencies": {
     "@babel/cli": "^7.2.3",
@@ -31,10 +29,11 @@
     "@babel/preset-env": "^7.3.1",
     "@babel/register": "^7.0.0",
     "chai": "^4.2.0",
+    "chai-as-promised": "^7.1.1",
     "coveralls": "^3.0.3",
     "mocha": "^5.2.0",
     "mock-browser": "^0.92.14",
-    "nyc": "^13.3.0",
+    "nyc": "^14.1.1",
     "sinon": "^7.2.3",
     "sinon-chai": "^3.3.0"
   }
diff --git a/src/index.js b/src/index.js
index f980b6d..a262706 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,9 +1,3 @@
-export const STATUS = {
-  FAILED: 0,
-  LOADING: 1,
-  LOADED: 2,
-}
-
 export function getNewScript (options = {}) {
   const script = document.createElement('script')
   script.type = 'text/javascript'
@@ -18,29 +12,27 @@ export function getNewScript (options = {}) {
 
   Object.entries(options).forEach(([key, value]) => {
     if (value) {
-      script[key] = value
+      script.setAttribute(key, value)
     }
   })
 
   return script
 }
 
-export function createPromise (options) {
+export function createPromise (options = {}) {
   return new Promise((resolve, reject) => {
     // append script to head
     appendScript(options, resolve, reject)
   })
 }
 
-export function appendScript (options, success, failure) {
+export function appendScript (options = {}, success = () => {}, failure = () => {}) {
   const script = getNewScript(options)
 
   script.onload = success
   script.onerror = failure
 
   document.head.appendChild(script)
-
-  return script
 }
 
 /**
@@ -52,14 +44,22 @@ export function appendScript (options, success, failure) {
  *  defer: true, // by default,
  * }
  *
- * callback = function
+ * onLoadHandler = function, will only execute once on load
+ * orErrorHandler = function,  will only execute once on error
+ *
+ * return Promise (resolves when the script is loaded, rejects when the script errors)
  */
-export default function (options = {}, callback) {
+export default function (
+  options,
+  onLoadHandler = () => {},
+  orErrorHandler = () => {}
+) {
   if (typeof window !== 'object') {
     return Promise.reject('sorry bro client side only')
   }
 
-  window.scriptLoader = window.scriptLoader || Object.create(null)
+  // Gloable namespace to prevent mismatch with different versions
+  window.dynamicScriptLoader = window.dynamicScriptLoader || Object.create(null)
 
   const src = options.src || ''
 
@@ -68,12 +68,12 @@ export default function (options = {}, callback) {
   }
 
   // create a promise that will return when resolved
-  if (!window.scriptLoader.src) {
-    window.scriptLoader.src = createPromise(options)
-      .then(callback) // call the main callback first
-      .catch(console.error)
+  if (!window.dynamicScriptLoader[src]) {
+    window.dynamicScriptLoader[src] = createPromise(options)
+      .then(onLoadHandler)
+      .catch(orErrorHandler)
   }
 
   // return promise
-  return window.scriptLoader.src
+  return window.dynamicScriptLoader[src]
 }
diff --git a/tests/unit/status.spec.js b/tests/unit/status.spec.js
deleted file mode 100644
index 85e149b..0000000
--- a/tests/unit/status.spec.js
+++ /dev/null
@@ -1,22 +0,0 @@
-import { STATUS } from '../../src/index'
-import { expect } from 'chai'
-
-describe('STATUS', () => {
-  it('status should contain 3 enums', () => {
-    const count = Object.keys(STATUS).length
-
-    expect(count).to.be.equal(3)
-  })
-
-  it('FAILED is set to 0', () => {
-    expect(STATUS.FAILED).to.be.equal(0)
-  })
-
-  it('LOADING is set to 1', () => {
-    expect(STATUS.LOADING).to.be.equal(1)
-  })
-
-  it('LOADED is set to 2', () => {
-    expect(STATUS.LOADED).to.be.equal(2)
-  })
-})
\ No newline at end of file