feat: bump typescript, use default type parameter (#1)

* feat: bump typescript, use default type parameter

* feat: add default type param

package.json

@@ -47,7 +47,7 @@
     "semantic-release": "^6.3.6",
     "tslint": "^5.0.0",
     "tslint-config-prettier": "^1.1.0",
-    "typescript": "^2.0.0",
+    "typescript": "^2.5.2",
     "validate-commit-msg": "^2.12.2"
   },
   "engines": {

src/core/trackedEvent.ts

@@ -20,7 +20,7 @@
  * }
  * @see {@link https://segment.com/docs/spec/track/#event}
  */
-export abstract class TrackedEvent<T> {
+export abstract class TrackedEvent<T = {}> {
   /**
    * We suggest human readable names consisting of noun + past tense verb.
    * @see {@link https://segment.com/academy/collecting-data/naming-conventions-for-clean-data/}
@@ -30,7 +30,7 @@ export abstract class TrackedEvent<T> {
 
   /**
    * Many trackers only support a limited number of arguments. For example,
-   * Google Analytics only supports 2: a string Event Label and an integer 
+   * Google Analytics only supports 2: a string Event Label and an integer
    * Event Value. By defining a priority to your arguments here, trackers
    * will submit the highest priority args satisfying their constraints. In
    * the Google Analytics case, the tracker will submit the first string match

src/core/value.ts

@@ -1 +1 @@
-export type Value = string | number;
+export type Value = string | number;

yarn.lock

@@ -4281,9 +4281,9 @@ typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
-typescript@^2.0.0:
-  version "2.4.1"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.4.1.tgz#c3ccb16ddaa0b2314de031e7e6fee89e5ba346bc"
+typescript@^2.5.2:
+  version "2.5.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.5.2.tgz#038a95f7d9bbb420b1bf35ba31d4c5c1dd3ffe34"
 
 uglify-js@^2.6:
   version "2.8.29"