support cjs

.eslintrc.cjs

@@ -96,6 +96,12 @@ module.exports = {
         '@typescript-eslint/strict-boolean-expressions': 'off'
       }
     },
+    {
+      files: ['**/*.cjs'],
+      env: {
+        node: true
+      }
+    },
     {
       extends: ['plugin:chai-expect/recommended', 'plugin:chai-friendly/recommended'],
       files: ['*.test.ts'],