add jest

babel.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  presets: [
+    ['@babel/preset-env', { targets: { node: 'current' } }],
+    '@babel/preset-typescript',
+  ],
+}

package.json

@@ -19,13 +19,18 @@
     "test": "wsrun -e -c -s test"
   },
   "devDependencies": {
+    "@babel/core": "^7.18.2",
+    "@babel/preset-env": "^7.18.2",
+    "@babel/preset-typescript": "^7.17.12",
     "@parcel/config-default": "^2.6.0",
     "@parcel/packager-ts": "2.3.2",
     "@parcel/transformer-js": "^2.6.0",
     "@parcel/transformer-react-refresh-wrap": "^2.6.0",
     "@parcel/transformer-typescript-types": "2.3.2",
+    "@types/jest": "^27.5.1",
     "@typescript-eslint/eslint-plugin": "^5.12.0",
     "@typescript-eslint/parser": "^5.12.0",
+    "babel-jest": "^28.1.0",
     "eslint": "^8.9.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-import-resolver-node": "^0.3.6",
@@ -39,6 +44,7 @@
     "eslint-plugin-react-hooks": "^4.3.0",
     "eslint-plugin-simple-import-sort": "^7.0.0",
     "husky": "^7.0.4",
+    "jest": "^28.1.0",
     "lint-staged": "^12.3.4",
     "npm-run-all": "^4.1.5",
     "parcel": "^2.3.2",