Revert "Use ESM for running tests"

This reverts commit 86371e0.

jest.config.js

@@ -1,13 +1,13 @@
-export default {
-    "name": "mock-axios",
-    "verbose": true,
-    "testRegex": "/test/.*\\.spec\\.(ts|tsx|js)$",
-    "moduleFileExtensions": [
-        "ts",
-        "tsx",
-        "js"
-    ],
-    "transform": {
-        "\\.(ts|tsx)$": "ts-jest"
-    }
-};
+module.exports = {
+    "name": "mock-axios",
+    "verbose": true,
+    "testRegex": "/test/.*\\.spec\\.(ts|tsx|js)$",
+    "moduleFileExtensions": [
+        "ts",
+        "tsx",
+        "js"
+    ],
+    "transform": {
+        "\\.(ts|tsx)$": "ts-jest"
+    }
+};

package.json

@@ -17,7 +17,7 @@
     "type-check:watch": "npm run type-check -- --watch",
     "build": "tsup lib/index.ts --format cjs,esm --dts --clean",
     "deploy2npm": "npm run build && npm publish",
-    "test": "cross-env NODE_OPTIONS=--experimental-vm-modules jest --watch"
+    "test": "jest --watch"
   },
   "repository": {
     "type": "git",