Add basic support for typescript tests

Author: JustWalters

.eslintrc.js

@@ -6,7 +6,7 @@ module.exports = {
   ],
   parser: '@typescript-eslint/parser',
   parserOptions: {
-    project: './tsconfig.json',
+    project: './tsconfig.eslint.json',
   },
   rules: {
     'no-param-reassign': 'off',

jest.config.ts

@@ -0,0 +1,7 @@
+import type { Config } from '@jest/types';
+
+const config: Config.InitialOptions = {
+  verbose: true,
+  preset: 'ts-jest',
+};
+export default config;