make jest work with js and ts

jest.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+  "roots": [
+    "./src"
+  ],
+  "transform": {
+    "^.+\\.ts$": "ts-jest",
+    "^.+\\.js$": "babel-jest",
+  },
+}

package.json

@@ -7,8 +7,12 @@
       "@babel/cli": "^7.6.4",
       "@babel/core": "^7.6.4",
       "@babel/preset-env": "^7.6.3",
+      "@types/lodash": "^4.14.144",
       "babel-jest": "^24.9.0",
       "jest": "^24.9.0",
+      "ts-jest": "^24.1.0",
+      "tsd": "^0.10.0",
+      "typescript": "^3.6.4",
       "updeep": "^1.2.0"
    },
    "license": "MIT",
@@ -25,11 +29,13 @@
       "url": "git+https://github.com/yanick/updux.git"
    },
    "keywords": [
-    "redux", "updeep"
+      "redux",
+      "updeep"
    ],
    "author": "Yanick Champoux <yanick@babyl.ca> (http://techblog.babyl.ca)",
    "bugs": {
       "url": "https://github.com/yanick/updux/issues"
    },
-  "homepage": "https://github.com/yanick/updux#readme"
+   "homepage": "https://github.com/yanick/updux#readme",
+   "types": "./index.d.ts"
 }