Enable TypeScript in Jest

Author: wimpyprogrammer

package.json

@@ -18,16 +18,18 @@
   },
   "jest": {
     "collectCoverageFrom": [
-      "**/src/**/?*.js"
+      "**/src/**/?*.(js|ts)"
     ],
     "transform": {
+      "^.+\\.ts$": "ts-jest"
     },
     "testMatch": [
-      "**/src/**/?*.spec.js"
+      "**/src/**/?*.spec.(js|ts)"
     ],
     "moduleFileExtensions": [
       "js",
-      "json"
+      "json",
+      "ts"
     ]
   },
   "dependencies": {},
@@ -41,6 +43,7 @@
     "prettier": "^1.13.7",
     "pretty-quick": "^1.6.0",
     "rimraf": "^2.6.2",
+    "ts-jest": "^23.0.1",
     "tslint": "^5.11.0",
     "typescript": "^2.9.2"
   }