build: some typescript related plus misc. improvements (#89)

* install @types/jest & @types/node

* make jest and node globals available

* add some missing trailing commas to the test files

* move Jest config to TS

* remove renovate config from package.json

* upgrade node to v18.16.1

* delete a yarn related file

Author: hesamurai

.eslintrc.js

@@ -7,6 +7,8 @@ module.exports = {
   env: {
     browser: true,
     es6: true,
+    jest: true,
+    node: true,
   },
   extends: [
     'eslint:recommended',

.nvmrc

@@ -1 +1 @@
-14.15.5
+18.16.1