diff --git a/package.json b/package.json
index a41fb591a..a47708d23 100644
--- a/package.json
+++ b/package.json
@@ -153,7 +153,6 @@
     "transformIgnorePatterns": [
       "/node_modules/(?!package-json)"
     ],
-    "extensionsToTreatAsEsm": [".ts", ".tsx", ".js"],
     "moduleNameMapper": {
       "\\.(css|less)$": "<rootDir>/testing/styleMock.js"
     },