diff --git a/jest.config.json b/jest.config.json
index 14a31f3..c956a4f 100644
--- a/jest.config.json
+++ b/jest.config.json
@@ -8,9 +8,8 @@
       "statements": 100
     }
   },
-  "extensionsToTreatAsEsm": [".ts", ".mts"],
   "moduleNameMapper": {
     "^(\\.{1,2}/.*)\\.mjs$": "<rootDir>/dist/$1.mjs"
   },
-  "testMatch": ["**/*.test.ts"]
+  "testMatch": ["**/*.test.js"]
 }
diff --git a/src/main.test.ts b/src/main.test.js
similarity index 100%
rename from src/main.test.ts
rename to src/main.test.js