chore: Setup jest environment

.babelrc

@@ -0,0 +1,12 @@
+{
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "targets": {
+          "node": "current"
+        }
+      }
+    ]
+  ]
+}

.eslintrc.json

@@ -1,84 +1,42 @@
 {
   "env": {
     "browser": true,
-    "es2021": true
+    "es2021": true,
+    "jest/globals": true
   },
-  "plugins": [
-    "jsdoc"
-  ],
+  "plugins": ["jsdoc", "jest"],
   "extends": [
     "airbnb-base",
-    "plugin:jsdoc/recommended"
+    "plugin:jsdoc/recommended",
+    "plugin:jest/recommended"
   ],
   "overrides": [],
   "parserOptions": {
     "ecmaVersion": "latest",
-      "sourceType": "module"
+    "sourceType": "module"
   },
   "settings": {
     "import/resolver": {
       "alias": {
         "map": [
-          [
-            "#root/*",
-            "./"
-          ],
-          [
-            "#lib/*",
-            "./lib"
-          ],
-          [
-            "#utils",
-            "./lib/utils/index.js"
-          ],
-          [
-            "#polyfills",
-            "./lib/build/polyfills/index.js"
-          ],
-          [
-            "#build",
-            "./lib/build/dispatcher/index.js"
-          ],
-          [
-            "#bundlers",
-            "./lib/build/bundlers/index.js"
-          ],
-          [
-            "#types",
-            "./lib/types/index.js"
-          ],
-          [
-            "#preset/*",
-            "./lib/presets"
-          ],
-          [
-            "#env",
-            "./lib/env/index.js"
-          ],
-          [
-            "#platform",
-            "./lib/platform/index.js"
-          ],
-          [
-            "#constants",
-            "./lib/constants/index.js"
-          ],
-          [
-            "#edge",
-            "./lib/platform/edgehooks/index.js"
-          ]
+          ["#root/*", "./"],
+          ["#lib/*", "./lib"],
+          ["#utils", "./lib/utils/index.js"],
+          ["#polyfills", "./lib/build/polyfills/index.js"],
+          ["#build", "./lib/build/dispatcher/index.js"],
+          ["#bundlers", "./lib/build/bundlers/index.js"],
+          ["#types", "./lib/types/index.js"],
+          ["#preset/*", "./lib/presets"],
+          ["#env", "./lib/env/index.js"],
+          ["#platform", "./lib/platform/index.js"],
+          ["#constants", "./lib/constants/index.js"],
+          ["#edge", "./lib/platform/edgehooks/index.js"]
         ],
-        "extensions": [
-          ".js",
-          ".json"
-        ]
+        "extensions": [".js", ".json"]
       }
     }
   },
   "rules": {
-    "import/extensions": [
-      "error",
-      "always"
-    ]
+    "import/extensions": ["error", "always"]
   }
-}
+}

jest.config.js

@@ -0,0 +1,6 @@
+export default {
+  transform: {
+    '^.+\\.(js|jsx)?$': 'babel-jest',
+  },
+  testEnvironment: 'node',
+};

package.json

@@ -11,7 +11,8 @@
     "start": "node lib/main.js",
     "task:aliases": "node tasks/sync-aliases.js",
     "task:docs": "jsdoc --configure jsdoc.json --verbose",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest",
+    "test:watch": "jest --watch"
   },
   "author": "",
   "license": "MIT",
@@ -32,12 +33,18 @@
     "webpack-merge": "^5.9.0"
   },
   "devDependencies": {
+    "@babel/core": "^7.22.5",
+    "@babel/preset-env": "^7.22.5",
+    "@jest/globals": "^29.5.0",
+    "babel-jest": "^29.5.0",
     "clean-jsdoc-theme": "^4.2.9",
     "eslint": "^7.32.0 || ^8.2.0",
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-import-resolver-alias": "^1.1.2",
     "eslint-plugin-import": "^2.25.2",
-    "eslint-plugin-jsdoc": "^44.2.5"
+    "eslint-plugin-jest": "^27.2.2",
+    "eslint-plugin-jsdoc": "^44.2.5",
+    "jest": "^29.5.0"
   },
   "imports": {
     "#root/*": "./",