diff --git a/src/core/createRspackCompiler.ts b/src/core/createRspackCompiler.ts
index 9c9fe85..e31cc4a 100644
--- a/src/core/createRspackCompiler.ts
+++ b/src/core/createRspackCompiler.ts
@@ -1,9 +1,11 @@
-import path from 'node:path'
+import { createRequire } from 'node:module'
 import type { Compiler, RspackOptions, RspackPluginInstance } from '@rspack/core'
 import * as rspackCore from '@rspack/core'
 import color from 'picocolors'
 import isCore from 'is-core-module'
-import { packageDir, vfs } from './utils'
+import { vfs } from './utils'
+
+const require = createRequire(import.meta.url)
 
 export interface CompilerOptions {
   cwd: string
@@ -23,8 +25,14 @@ export function createCompiler(
 
   async function handler(err: Error | null, stats?: rspackCore.Stats) {
     const name = '[rspack:mock]'
-    const logError = stats?.compilation.getLogger(name).error
-      || ((...args: string[]) => console.error(color.red(name), ...args))
+    const logError = (...args: any[]) => {
+      if (stats) {
+        stats.compilation.getLogger(name).error(...args)
+      }
+      else {
+        console.error(color.red(name), ...args)
+      }
+    }
 
     if (err) {
       logError(err.stack || err)
@@ -121,7 +129,7 @@ function resolveRspackOptions({
       rules: [
         {
           test: /\.json5?$/,
-          loader: path.join(packageDir, 'json5-loader.cjs'),
+          loader: require.resolve('#json5-loader'),
           type: 'javascript/auto',
         },
         {
diff --git a/src/json5-loader.cts b/src/json5-loader.cts
new file mode 100644
index 0000000..d5913b4
--- /dev/null
+++ b/src/json5-loader.cts
@@ -0,0 +1,8 @@
+import JSON5 from 'json5'
+
+module.exports = function (content: string): string {
+  if (!content)
+    return 'export default {}'
+
+  return `export default ${JSON.stringify(JSON5.parse(content))}`
+}
diff --git a/src/json5-loader.ts b/src/json5-loader.ts
deleted file mode 100644
index 1bdfe69..0000000
--- a/src/json5-loader.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import JSON5 from 'json5'
-import type { LoaderDefinitionFunction } from '@rspack/core'
-
-const json5Loader: LoaderDefinitionFunction = function (content) {
-  if (!content)
-    return 'export default {}'
-
-  return `export default ${JSON.stringify(JSON5.parse(content))}`
-}
-
-export default json5Loader