diff --git a/package.json b/package.json
index bcbd1daa..56e97c53 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "build": "VITE_GIT_HASH=`git log -1 --pretty=format:%h` vite build --config vite.config.mts",
     "lint": "eslint --ext .js,.ts,.vue --ignore-path .gitignore src",
     "lint-fix": "eslint --ext .js,.ts,.vue --ignore-path .gitignore --fix src",
-    "prebuild": "eslint --ext .js,.ts,.vue --ignore-path .gitignore src && node sw_combine.js && node scripts/copy-wasm.js",
+    "prebuild": "eslint --ext .js,.ts,.vue --ignore-path .gitignore src && node sw_combine.cjs && node scripts/copy-wasm.cjs",
     "test:all": "npm run test:prerequisites && npm run build && npm run test:web && npm run test:mobile",
     "test:prerequisites": "node scripts/check-prerequisites.js",
     "test:web": "npx playwright test -c playwright.config-local.ts --trace on",
diff --git a/scripts/copy-wasm.js b/scripts/copy-wasm.cjs
similarity index 100%
rename from scripts/copy-wasm.js
rename to scripts/copy-wasm.cjs
diff --git a/sw_combine.js b/sw_combine.cjs
similarity index 100%
rename from sw_combine.js
rename to sw_combine.cjs