Add stronger typing support, fix bad tests

 - Correctly provide return value type when using
   the 'object' return notation
 - Fix code in tests that wasn't running
 - Add `prettier`

Author: Shrugsy

.eslintrc

@@ -1,7 +1,8 @@
 {
   "parser": "@typescript-eslint/parser",
-  "plugins": ["@typescript-eslint", "react-hooks"],
+  "plugins": ["@typescript-eslint", "react-hooks", "prettier"],
   "rules": {
+    "prettier/prettier": "error",
     "react-hooks/rules-of-hooks": "error",
     "react-hooks/exhaustive-deps": [
       "warn",

.prettierrc

@@ -0,0 +1,7 @@
+{
+    "printWidth": 100,
+    "trailingComma": "es5",
+    "tabWidth": 2,
+    "semi": true,
+    "singleQuote": true
+}