Feat: es modules (#139)

* All file imports change from commonjs to es-module

* Improved plex error responses back from api

* Converted viewHistory to es module

* Es-module requires file extension, updated all imports

* Fix esmodule not having __dirname defined in scope

* Replace dynamic-require with fs readFileSync

* Short message service module function is exported as default

* Resolved lint issues & ignore import/extension rule until typescript

* All tests file imports changed from commonjs to es-module

* Import json fixtures with new helper

tests/helpers/createToken.js

@@ -1,10 +1,8 @@
-const User = require("../../src/user/user");
-const Token = require("../../src/user/token");
+import User from "../../src/user/user.js";
+import Token from "../../src/user/token.js";
 
-function createToken(username, secret) {
+export default function createToken(username, secret) {
   const user = new User(username);
   const token = new Token(user);
   return token.toString(secret);
 }
-
-module.exports = createToken;