chore: update jest config to support typescript

Author: KyleRoss

jest.config.js

@@ -0,0 +1,17 @@
+import type { Config } from '@jest/types';
+
+const config: Config.InitialOptions = {
+  testEnvironment: 'node',
+  testRegex: '\\.test\\.ts$',
+  collectCoverage: true,
+  collectCoverageFrom: ['src/**/*.ts'],
+  coverageDirectory: 'coverage',
+  coverageProvider: 'v8',
+  coveragePathIgnorePatterns: ['/node_modules/', '/dist/', '<rootDir>/src/typings.ts'],
+  transform: {
+    '^.+\\.ts$': 'ts-jest'
+  },
+  moduleFileExtensions: ['ts', 'js', 'json', 'node']
+};
+
+export default config;