diff --git a/.abstruse.yml b/.abstruse.yml
new file mode 100644
index 00000000..7e02de72
--- /dev/null
+++ b/.abstruse.yml
@@ -0,0 +1,18 @@
+image: abstruse
+
+matrix:
+  - env: SCRIPT=test NODE_VERSION=8
+
+before_install:
+  - nvm install $NODE_VERSION
+  - npm config set spin false
+  - npm config set progress false
+
+install:
+  - npm install
+
+script:
+  - if [[ "$SCRIPT" ]]; then npm run-script $SCRIPT; fi
+
+cache:
+  - node_modules
diff --git a/package-lock.json b/package-lock.json
index 667447e5..2a4e4da3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "ngx-uploader",
-  "version": "4.0.2",
+  "version": "4.2.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -176,6 +176,12 @@
         "@types/node": "8.0.47"
       }
     },
+    "@types/chai": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.0.4.tgz",
+      "integrity": "sha512-cvU0HomQ7/aGDQJZsbtJXqBQ7w4J4TqLB0Z/h8mKrpRjfeZEvTbygkfJEb7fWdmwpIeDeFmIVwAEqS0OYuUv3Q==",
+      "dev": true
+    },
     "@types/cors": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.1.tgz",
@@ -233,6 +239,12 @@
       "integrity": "sha512-rUO/jz10KRSyA9SHoCWQ8WX9BICyj5jZYu1/ucKEJKb4KzLZCKMURdYbadP157Q6Zl1x0vHsrU+Z/O0XlhYQDw==",
       "dev": true
     },
+    "@types/mocha": {
+      "version": "2.2.44",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-2.2.44.tgz",
+      "integrity": "sha512-k2tWTQU8G4+iSMvqKi0Q9IIsWAp/n8xzdZS4Q4YVIltApoMA00wFBFdlJnmoaK1/z7B0Cy0yPe6GgXteSmdUNw==",
+      "dev": true
+    },
     "@types/multer": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/@types/multer/-/multer-1.3.5.tgz",
@@ -642,6 +654,12 @@
       "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ=",
       "dev": true
     },
+    "assertion-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.0.2.tgz",
+      "integrity": "sha1-E8pRXYYgbaC6xm6DTdOX2HWBCUw=",
+      "dev": true
+    },
     "ast-types": {
       "version": "0.9.6",
       "resolved": "https://registry.npmjs.org/ast-types/-/ast-types-0.9.6.tgz",
@@ -1003,6 +1021,12 @@
       "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8=",
       "dev": true
     },
+    "browser-stdout": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "dev": true
+    },
     "browserify-aes": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/browserify-aes/-/browserify-aes-1.1.1.tgz",
@@ -1250,6 +1274,20 @@
         }
       }
     },
+    "chai": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.1.2.tgz",
+      "integrity": "sha1-D2RYS6ZC8PKs4oBiefTwbKI61zw=",
+      "dev": true,
+      "requires": {
+        "assertion-error": "1.0.2",
+        "check-error": "1.0.2",
+        "deep-eql": "3.0.1",
+        "get-func-name": "2.0.0",
+        "pathval": "1.1.0",
+        "type-detect": "4.0.5"
+      }
+    },
     "chalk": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
@@ -1263,6 +1301,12 @@
         "supports-color": "2.0.0"
       }
     },
+    "check-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
+      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
+      "dev": true
+    },
     "chokidar": {
       "version": "1.7.0",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-1.7.0.tgz",
@@ -2030,6 +2074,15 @@
       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
       "dev": true
     },
+    "deep-eql": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-3.0.1.tgz",
+      "integrity": "sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==",
+      "dev": true,
+      "requires": {
+        "type-detect": "4.0.5"
+      }
+    },
     "deep-equal": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-1.0.1.tgz",
@@ -4056,6 +4109,12 @@
       "integrity": "sha1-9wLmMSfn4jHBYKgMFVSstw1QR+U=",
       "dev": true
     },
+    "get-func-name": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.0.tgz",
+      "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE=",
+      "dev": true
+    },
     "get-stdin": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-4.0.1.tgz",
@@ -4226,6 +4285,12 @@
       "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
       "dev": true
     },
+    "growl": {
+      "version": "1.10.3",
+      "resolved": "https://registry.npmjs.org/growl/-/growl-1.10.3.tgz",
+      "integrity": "sha512-hKlsbA5Vu3xsh1Cg3J7jSmX/WaW6A5oBeqzM88oNbCRQFz+zUaXm6yxS4RVytp1scBoJzSYl4YAEOQIt6O8V1Q==",
+      "dev": true
+    },
     "handle-thing": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/handle-thing/-/handle-thing-1.2.5.tgz",
@@ -4668,6 +4733,12 @@
       "integrity": "sha1-SMptcvbGo68Aqa1K5odr44ieKwk=",
       "dev": true
     },
+    "ignore-styles": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ignore-styles/-/ignore-styles-5.0.1.tgz",
+      "integrity": "sha1-tJ7yJ0va/NikiAqWa/440aC/RnE=",
+      "dev": true
+    },
     "immediate": {
       "version": "3.0.6",
       "resolved": "https://registry.npmjs.org/immediate/-/immediate-3.0.6.tgz",
@@ -5960,6 +6031,56 @@
         }
       }
     },
+    "mocha": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-4.0.1.tgz",
+      "integrity": "sha512-evDmhkoA+cBNiQQQdSKZa2b9+W2mpLoj50367lhy+Klnx9OV8XlCIhigUnn1gaTFLQCa0kdNhEGDr0hCXOQFDw==",
+      "dev": true,
+      "requires": {
+        "browser-stdout": "1.3.0",
+        "commander": "2.11.0",
+        "debug": "3.1.0",
+        "diff": "3.3.1",
+        "escape-string-regexp": "1.0.5",
+        "glob": "7.1.2",
+        "growl": "1.10.3",
+        "he": "1.1.1",
+        "mkdirp": "0.5.1",
+        "supports-color": "4.4.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "diff": {
+          "version": "3.3.1",
+          "resolved": "https://registry.npmjs.org/diff/-/diff-3.3.1.tgz",
+          "integrity": "sha512-MKPHZDMB0o6yHyDryUOScqZibp914ksXwAMYMTHj6KO8UeKsRYNJD3oNCKjTqZon+V488P7N/HzXF8t7ZR95ww==",
+          "dev": true
+        },
+        "has-flag": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-2.0.0.tgz",
+          "integrity": "sha1-6CB68cx7MNRGzHC3NLXovhj4jVE=",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "4.4.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.4.0.tgz",
+          "integrity": "sha512-rKC3+DyXWgK0ZLKwmRsrkyHVZAjNkfzeehuFWdGGcqGDTZFH73+RH6S/RDAAxl9GusSjZSUWYLmT9N5pzXFOXQ==",
+          "dev": true,
+          "requires": {
+            "has-flag": "2.0.0"
+          }
+        }
+      }
+    },
     "ms": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
@@ -6707,6 +6828,12 @@
         "pinkie-promise": "2.0.1"
       }
     },
+    "pathval": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.0.tgz",
+      "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA=",
+      "dev": true
+    },
     "pause-stream": {
       "version": "0.0.11",
       "resolved": "https://registry.npmjs.org/pause-stream/-/pause-stream-0.0.11.tgz",
@@ -7982,6 +8109,12 @@
       "integrity": "sha1-six699nWiBvItuZTM17rywoYh0g=",
       "dev": true
     },
+    "rewire": {
+      "version": "2.5.2",
+      "resolved": "https://registry.npmjs.org/rewire/-/rewire-2.5.2.tgz",
+      "integrity": "sha1-ZCfee3/u+n02QBUH62SlOFvFjcc=",
+      "dev": true
+    },
     "right-align": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/right-align/-/right-align-0.1.3.tgz",
@@ -9350,6 +9483,12 @@
       "dev": true,
       "optional": true
     },
+    "type-detect": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.5.tgz",
+      "integrity": "sha512-N9IvkQslUGYGC24RkJk1ba99foK6TkwC2FHAEBlQFBP0RxQZS8ZpJuAZcwiY/w9ZJHFQb1aOXBI60OdxhTrwEQ==",
+      "dev": true
+    },
     "type-is": {
       "version": "1.6.15",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.15.tgz",
diff --git a/src/ngx-uploader/classes/ngx-uploader.spec.ts b/src/ngx-uploader/classes/ngx-uploader.spec.ts
index 78cedc43..600e1bb2 100644
--- a/src/ngx-uploader/classes/ngx-uploader.spec.ts
+++ b/src/ngx-uploader/classes/ngx-uploader.spec.ts
@@ -3,7 +3,7 @@ import { expect } from 'chai';
 import 'mocha';
 import { describe } from 'selenium-webdriver/testing';
 
-import rewire = require('rewire');
+import * as rewire from 'rewire';
 let rewiredNgUploaderService = rewire('./ngx-uploader.class');
 
 describe('NgUploaderService constructor', () => {
diff --git a/tsconfig.bundle.json b/tsconfig.bundle.json
index d2154afd..823377bc 100644
--- a/tsconfig.bundle.json
+++ b/tsconfig.bundle.json
@@ -15,11 +15,17 @@
     "outDir": "lib",
     "typeRoots": [
       "node_modules/@types"
+    ],
+    "types": [
+      "mocha"
     ]
   },
   "include": [
     "index.ts",
     "ngx-uploader.ts",
     "src/ngx-uploader/**/*.ts"
+  ],
+  "exclude": [
+    "**/*.spec.ts"
   ]
 }
diff --git a/tsconfig.json b/tsconfig.json
index 2a68075b..c8f9bc04 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,8 +12,5 @@
     "typeRoots": [
       "node_modules/@types"
     ]
-  },
-  "files": [
-    "src/api/index.ts"
-  ]
+  }
 }