Fix tests

jest.config.js

@@ -173,7 +173,9 @@ module.exports = {
   // testRunner: "jest-circus/runner",
 
   // A map from regular expressions to paths to transformers
-  // transform: undefined,
+  transform: {
+    '.js$': './jest/esm-transformer.js',
+  },
 
   // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
   // transformIgnorePatterns: [

jest/esm-transformer.js

@@ -0,0 +1,13 @@
+const babel = require('@babel/core')
+
+module.exports = {
+  process(src) {
+    const transform = babel.transform(src, {
+      babelrc: false,
+      compact: false,
+      plugins: [require.resolve('@babel/plugin-transform-modules-commonjs')],
+    })
+
+    return transform
+  },
+}

package.json

@@ -16,6 +16,8 @@
     "test": "yarn node --experimental-vm-modules $(yarn bin jest)"
   },
   "devDependencies": {
+    "@babel/core": "7.18.9",
+    "@babel/plugin-transform-modules-commonjs": "7.18.6",
     "jest": "28.0.0",
     "jest-environment-jsdom": "28.0.0",
     "prettier": "2.5.1"