Test typescript and collect coverage.

We don't actually have any tests yet :(

client/package.json

@@ -69,11 +69,19 @@
     "electron": "^21.1.0",
     "electron-is-dev": "^2.0.0",
     "generate-license-file": "^2.0.0",
-    "got": "^11.8.5",
+    "identity-obj-proxy": "^3.0.0",
     "license-checker": "^25.0.1",
     "nth-check": "^2.0.1",
     "react-scripts": "5.0.1",
     "ts-node": "^10.9.1",
     "wait-on": "^6.0.1"
+  },
+  "jest": {
+    "transformIgnorePatterns": [
+      "node_modules/(?!(@?react-leaflet|axios)/)"
+    ],
+    "moduleNameMapper": {
+      ".+\\.(css|styl|less|sass|scss|png|jpg|ttf|woff|woff2)$": "identity-obj-proxy"
+    }
   }
 }