feat: add basic jest setup

Author: usefulthink

jest.config.js

@@ -0,0 +1,10 @@
+export default {
+  roots: ['<rootDir>/src'],
+  testMatch: [
+    '**/__tests__/**/*.+(ts|tsx|js)',
+    '**/?(*.)+(spec|test).+(ts|tsx|js)'
+  ],
+  transform: {
+    '^.+\\.(ts|tsx)$': 'ts-jest'
+  }
+};