diff --git a/.travis.yml b/.travis.yml
index b1c3783..917478a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,7 @@
 language: node_js
 node_js:
-    - node # = latest
-before_install:
-    - npm i -g typescript
-    - tsc --version
+  - node # = latest
 install:
-    - npm ci
-    - tsc
\ No newline at end of file
+  - npm ci
+script:
+  - npm test
diff --git a/package-lock.json b/package-lock.json
index 4ca7b9a..adfb2ff 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,9 +11,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "10.11.2",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-10.11.2.tgz",
-      "integrity": "sha512-XubfQDIg88PGJ7netQPf3QOKHF7Xht4WXGtg5W7cGBeQs9ETbYKwfchR9o+tRRA9iLTQ7nAre85M205JbYsjJA==",
+      "version": "10.17.3",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-10.17.3.tgz",
+      "integrity": "sha512-QZ9CjUB3QoA3f2afw3utKlfRPhpmufB7jC2+oDhLWnXqoyx333fhKSQDLQu2EK7OE0a15X67eYiRAaJsHXrpMA==",
       "dev": true
     },
     "adm-zip": {
@@ -214,6 +214,12 @@
         "has-flag": "^3.0.0"
       }
     },
+    "typescript": {
+      "version": "3.6.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.4.tgz",
+      "integrity": "sha512-unoCll1+l+YK4i4F8f22TaNVPRHcD9PA3yCuZ8g5e0qGqlVlJ/8FSateOLLSagn+Yg5+ZwuPkL8LFUc0Jcvksg==",
+      "dev": true
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -263,13 +269,15 @@
             "mkdirp": {
               "version": "0.5.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               },
               "dependencies": {
                 "minimist": {
                   "version": "0.0.8",
-                  "bundled": true
+                  "bundled": true,
+                  "optional": true
                 }
               }
             },
@@ -368,7 +376,8 @@
                 },
                 "console-control-strings": {
                   "version": "1.1.0",
-                  "bundled": true
+                  "bundled": true,
+                  "optional": true
                 },
                 "gauge": {
                   "version": "2.7.2",
@@ -409,6 +418,7 @@
                     "string-width": {
                       "version": "1.0.2",
                       "bundled": true,
+                      "optional": true,
                       "requires": {
                         "code-point-at": "^1.0.0",
                         "is-fullwidth-code-point": "^1.0.0",
@@ -417,18 +427,21 @@
                       "dependencies": {
                         "code-point-at": {
                           "version": "1.1.0",
-                          "bundled": true
+                          "bundled": true,
+                          "optional": true
                         },
                         "is-fullwidth-code-point": {
                           "version": "1.0.0",
                           "bundled": true,
+                          "optional": true,
                           "requires": {
                             "number-is-nan": "^1.0.0"
                           },
                           "dependencies": {
                             "number-is-nan": {
                               "version": "1.0.1",
-                              "bundled": true
+                              "bundled": true,
+                              "optional": true
                             }
                           }
                         }
@@ -437,13 +450,15 @@
                     "strip-ansi": {
                       "version": "3.0.1",
                       "bundled": true,
+                      "optional": true,
                       "requires": {
                         "ansi-regex": "^2.0.0"
                       },
                       "dependencies": {
                         "ansi-regex": {
                           "version": "2.0.0",
-                          "bundled": true
+                          "bundled": true,
+                          "optional": true
                         }
                       }
                     },
@@ -547,13 +562,15 @@
                 "combined-stream": {
                   "version": "1.0.5",
                   "bundled": true,
+                  "optional": true,
                   "requires": {
                     "delayed-stream": "~1.0.0"
                   },
                   "dependencies": {
                     "delayed-stream": {
                       "version": "1.0.0",
-                      "bundled": true
+                      "bundled": true,
+                      "optional": true
                     }
                   }
                 },
@@ -743,6 +760,7 @@
                     "boom": {
                       "version": "2.10.1",
                       "bundled": true,
+                      "optional": true,
                       "requires": {
                         "hoek": "2.x.x"
                       }
@@ -757,7 +775,8 @@
                     },
                     "hoek": {
                       "version": "2.16.3",
-                      "bundled": true
+                      "bundled": true,
+                      "optional": true
                     },
                     "sntp": {
                       "version": "1.0.9",
@@ -796,7 +815,8 @@
                       "dependencies": {
                         "extsprintf": {
                           "version": "1.0.2",
-                          "bundled": true
+                          "bundled": true,
+                          "optional": true
                         },
                         "json-schema": {
                           "version": "0.2.3",
@@ -836,7 +856,8 @@
                         },
                         "assert-plus": {
                           "version": "1.0.0",
-                          "bundled": true
+                          "bundled": true,
+                          "optional": true
                         },
                         "bcrypt-pbkdf": {
                           "version": "1.0.0",
@@ -910,13 +931,15 @@
                 "mime-types": {
                   "version": "2.1.13",
                   "bundled": true,
+                  "optional": true,
                   "requires": {
                     "mime-db": "~1.25.0"
                   },
                   "dependencies": {
                     "mime-db": {
                       "version": "1.25.0",
-                      "bundled": true
+                      "bundled": true,
+                      "optional": true
                     }
                   }
                 },
@@ -965,6 +988,7 @@
             "rimraf": {
               "version": "2.5.4",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "glob": "^7.0.5"
               },
@@ -972,6 +996,7 @@
                 "glob": {
                   "version": "7.1.1",
                   "bundled": true,
+                  "optional": true,
                   "requires": {
                     "fs.realpath": "^1.0.0",
                     "inflight": "^1.0.4",
@@ -983,11 +1008,13 @@
                   "dependencies": {
                     "fs.realpath": {
                       "version": "1.0.0",
-                      "bundled": true
+                      "bundled": true,
+                      "optional": true
                     },
                     "inflight": {
                       "version": "1.0.6",
                       "bundled": true,
+                      "optional": true,
                       "requires": {
                         "once": "^1.3.0",
                         "wrappy": "1"
@@ -995,17 +1022,20 @@
                       "dependencies": {
                         "wrappy": {
                           "version": "1.0.2",
-                          "bundled": true
+                          "bundled": true,
+                          "optional": true
                         }
                       }
                     },
                     "inherits": {
                       "version": "2.0.3",
-                      "bundled": true
+                      "bundled": true,
+                      "optional": true
                     },
                     "minimatch": {
                       "version": "3.0.3",
                       "bundled": true,
+                      "optional": true,
                       "requires": {
                         "brace-expansion": "^1.0.0"
                       },
@@ -1013,6 +1043,7 @@
                         "brace-expansion": {
                           "version": "1.1.6",
                           "bundled": true,
+                          "optional": true,
                           "requires": {
                             "balanced-match": "^0.4.1",
                             "concat-map": "0.0.1"
@@ -1020,11 +1051,13 @@
                           "dependencies": {
                             "balanced-match": {
                               "version": "0.4.2",
-                              "bundled": true
+                              "bundled": true,
+                              "optional": true
                             },
                             "concat-map": {
                               "version": "0.0.1",
-                              "bundled": true
+                              "bundled": true,
+                              "optional": true
                             }
                           }
                         }
@@ -1033,19 +1066,22 @@
                     "once": {
                       "version": "1.4.0",
                       "bundled": true,
+                      "optional": true,
                       "requires": {
                         "wrappy": "1"
                       },
                       "dependencies": {
                         "wrappy": {
                           "version": "1.0.2",
-                          "bundled": true
+                          "bundled": true,
+                          "optional": true
                         }
                       }
                     },
                     "path-is-absolute": {
                       "version": "1.0.1",
-                      "bundled": true
+                      "bundled": true,
+                      "optional": true
                     }
                   }
                 }
@@ -1059,6 +1095,7 @@
             "tar": {
               "version": "2.2.1",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "block-stream": "*",
                 "fstream": "^1.0.2",
@@ -1068,6 +1105,7 @@
                 "block-stream": {
                   "version": "0.0.9",
                   "bundled": true,
+                  "optional": true,
                   "requires": {
                     "inherits": "~2.0.0"
                   }
@@ -1075,6 +1113,7 @@
                 "fstream": {
                   "version": "1.0.10",
                   "bundled": true,
+                  "optional": true,
                   "requires": {
                     "graceful-fs": "^4.1.2",
                     "inherits": "~2.0.0",
@@ -1084,13 +1123,15 @@
                   "dependencies": {
                     "graceful-fs": {
                       "version": "4.1.11",
-                      "bundled": true
+                      "bundled": true,
+                      "optional": true
                     }
                   }
                 },
                 "inherits": {
                   "version": "2.0.3",
-                  "bundled": true
+                  "bundled": true,
+                  "optional": true
                 }
               }
             },
@@ -1127,6 +1168,7 @@
                 "fstream": {
                   "version": "1.0.10",
                   "bundled": true,
+                  "optional": true,
                   "requires": {
                     "graceful-fs": "^4.1.2",
                     "inherits": "~2.0.0",
@@ -1136,11 +1178,13 @@
                   "dependencies": {
                     "graceful-fs": {
                       "version": "4.1.11",
-                      "bundled": true
+                      "bundled": true,
+                      "optional": true
                     },
                     "inherits": {
                       "version": "2.0.3",
-                      "bundled": true
+                      "bundled": true,
+                      "optional": true
                     }
                   }
                 },
diff --git a/package.json b/package.json
index 6eeceb6..c1f1bb2 100644
--- a/package.json
+++ b/package.json
@@ -43,10 +43,12 @@
   },
   "devDependencies": {
     "@types/mocha": "^5.2.5",
-    "@types/node": "^10.11.2",
-    "mocha": "^5.2.0"
+    "@types/node": "^10.11.7",
+    "mocha": "^5.2.0",
+    "typescript": "3.6.4"
   },
   "scripts": {
-    "test": "node_modules/.bin/mocha dist/test/ --exit"
+    "pretest": "tsc",
+    "test": "mocha dist/test/ --exit"
   }
 }