diff --git a/packages/utils/package.json b/packages/utils/package.json
index cc896cca78..15b13a9d3f 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -30,7 +30,7 @@
   "scripts": {
     "prebuild": "npm run reset-self",
     "build": "tsc -b",
-    "postbuild": "rollup -c dist/rollup.config.mjs",
+    "postbuild": "rollup -c rollup.config.mjs",
     "check": "tsc -b tsconfig.jest.json",
     "reset-self": "find . -name \"*.tsbuildinfo\" -delete || true",
     "clean": "jest --clearCache --config '{}' || true; rm -rf dist *.tsbuildinfo node_modules/.cache || true",
diff --git a/packages/utils/rollup.config.mts b/packages/utils/rollup.config.mjs
similarity index 89%
rename from packages/utils/rollup.config.mts
rename to packages/utils/rollup.config.mjs
index cc5085ee5c..91e22af474 100644
--- a/packages/utils/rollup.config.mts
+++ b/packages/utils/rollup.config.mjs
@@ -1,10 +1,10 @@
-import { defineConfig, type RollupOptions } from 'rollup'
+import { defineConfig } from 'rollup'
 import { dts } from 'rollup-plugin-dts'
-import alias, { type Alias } from '@rollup/plugin-alias'
+import alias from '@rollup/plugin-alias'
 import { nodeResolve } from '@rollup/plugin-node-resolve'
 import { fileURLToPath } from 'node:url'
 
-const nodejsAliases: Alias[] = [
+const nodejsAliases = [
     {
         find: /^@\//,
         replacement: fileURLToPath(
@@ -13,7 +13,7 @@ const nodejsAliases: Alias[] = [
     },
 ]
 
-const browserAliases: Alias[] = [
+const browserAliases = [
     {
         find: /^@\//,
         replacement: fileURLToPath(
@@ -47,7 +47,7 @@ export default defineConfig([
     browserTypes(),
 ])
 
-function nodejs(): RollupOptions {
+function nodejs() {
     return {
         input: 'dist/node/src/exports.js',
         output: [
@@ -76,7 +76,7 @@ function nodejs(): RollupOptions {
     }
 }
 
-function browser(): RollupOptions {
+function browser() {
     return {
         input: 'dist/browser/src/exports-browser.js',
         output: [
@@ -103,7 +103,7 @@ function browser(): RollupOptions {
     }
 }
 
-function nodejsTypes(): RollupOptions {
+function nodejsTypes() {
     return {
         input: 'dist/node/src/exports.d.ts',
         output: [
@@ -121,7 +121,7 @@ function nodejsTypes(): RollupOptions {
     }
 }
 
-function browserTypes(): RollupOptions {
+function browserTypes() {
     return {
         input: 'dist/browser/src/exports-browser.d.ts',
         output: [
diff --git a/packages/utils/tsconfig.rollup.json b/packages/utils/tsconfig.rollup.json
deleted file mode 100644
index c19d62d4ea..0000000000
--- a/packages/utils/tsconfig.rollup.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "extends": "./tsconfig.node.json",
-  "compilerOptions": {
-    "outDir": "dist",
-    "paths": {}
-  },
-  "include": [
-    "rollup.config.mts"
-  ],
-  "exclude": []
-}