diff --git a/src/components/Playground/CodeEditor/FileSelector/index.tsx b/src/components/Playground/CodeEditor/FileSelector/index.tsx
index aa2cb62..b86cb55 100644
--- a/src/components/Playground/CodeEditor/FileSelector/index.tsx
+++ b/src/components/Playground/CodeEditor/FileSelector/index.tsx
@@ -110,6 +110,10 @@ const FileSelector = ({
     }
 
     const handleOnValidateTab = (newFileName: string, oldFileName: string) => {
+        if (newFileName.length > 40) {
+            onError?.('File name is too long, maximum 40 characters.')
+        }
+
         if (!/\.(jsx|tsx|js|ts|css|json)$/.test(newFileName)) {
             onError?.('Playground only supports *.jsx, *.tsx, *.js, *.ts, *.css, *.json files.')
 
@@ -219,4 +223,6 @@ const FileSelector = ({
     )
 }
 
+FileSelector.Item = Item
+
 export default FileSelector
diff --git a/src/components/Playground/CodeEditor/index.tsx b/src/components/Playground/CodeEditor/index.tsx
index 938aa66..b2d70d6 100644
--- a/src/components/Playground/CodeEditor/index.tsx
+++ b/src/components/Playground/CodeEditor/index.tsx
@@ -160,4 +160,7 @@ const CodeEditor = ({
     )
 }
 
+CodeEditor.Editor = Editor
+CodeEditor.FileSelector = FileSelector
+
 export default CodeEditor
diff --git a/src/components/Playground/Output/Preview/Render.tsx b/src/components/Playground/Output/Preview/Render.tsx
index 940a80f..62464d2 100644
--- a/src/components/Playground/Output/Preview/Render.tsx
+++ b/src/components/Playground/Output/Preview/Render.tsx
@@ -1,3 +1,4 @@
+import '@/components/Playground/Output/Preview/render.scss'
 import iframeRaw from '@/components/Playground/Output/Preview/iframe.html?raw'
 
 interface RenderProps {
@@ -66,6 +67,7 @@ const Render = ({ iframeKey, compiledCode, onError }: RenderProps) => {
 
     return (
         <iframe
+            data-component={'playground-output-preview-render'}
             key={iframeKey}
             ref={iframeRef}
             src={iframeUrl}
diff --git a/src/components/Playground/Output/Preview/iframe.html b/src/components/Playground/Output/Preview/iframe.html
index b485bf9..95c6c95 100644
--- a/src/components/Playground/Output/Preview/iframe.html
+++ b/src/components/Playground/Output/Preview/iframe.html
@@ -48,11 +48,6 @@
   });
 </script>
 <script type="module" id="appSrc"></script>
-<div id="root">
-  <div
-    style="position:absolute;top: 0;left:0;width:100%;height:100%;display: flex;justify-content: center;align-items: center;">
-    Loading...
-  </div>
-</div>
+<div id="root"></div>
 </body>
 </html>
diff --git a/src/components/Playground/Output/Preview/index.tsx b/src/components/Playground/Output/Preview/index.tsx
index 2f6dd0b..93cedc3 100644
--- a/src/components/Playground/Output/Preview/index.tsx
+++ b/src/components/Playground/Output/Preview/index.tsx
@@ -1,16 +1,16 @@
 import '@/components/Playground/Output/Preview/preview.scss'
 import { IFiles, IImportMap } from '@/components/Playground/shared'
 import Compiler from '@/components/Playground/compiler'
-import { ENTRY_FILE_NAME } from '@/components/Playground/files'
 import Render from '@/components/Playground/Output/Preview/Render'
 
 interface PreviewProps {
     iframeKey: string
     files: IFiles
     importMap: IImportMap
+    entryPoint: string
 }
 
-const Preview = ({ iframeKey, files, importMap }: PreviewProps) => {
+const Preview = ({ iframeKey, files, importMap, entryPoint }: PreviewProps) => {
     const [errorMsg, setErrorMsg] = useState('')
     const [compiledCode, setCompiledCode] = useState('')
 
@@ -19,7 +19,7 @@ const Preview = ({ iframeKey, files, importMap }: PreviewProps) => {
     }
 
     useEffect(() => {
-        Compiler.compile(files, importMap, [ENTRY_FILE_NAME])
+        Compiler.compile(files, importMap, entryPoint)
             .then((result) => {
                 setCompiledCode(result.outputFiles[0].text)
             })
@@ -36,4 +36,6 @@ const Preview = ({ iframeKey, files, importMap }: PreviewProps) => {
     )
 }
 
+Preview.Render = Render
+
 export default Preview
diff --git a/src/components/Playground/Output/Preview/preview.scss b/src/components/Playground/Output/Preview/preview.scss
index 9fd2079..e69a5b6 100644
--- a/src/components/Playground/Output/Preview/preview.scss
+++ b/src/components/Playground/Output/Preview/preview.scss
@@ -3,9 +3,4 @@
   position: relative;
   width: 100%;
   height: 100%;
-
-  iframe {
-    border: none;
-    flex: 1;
-  }
 }
\ No newline at end of file
diff --git a/src/components/Playground/Output/Preview/render.scss b/src/components/Playground/Output/Preview/render.scss
new file mode 100644
index 0000000..fc11967
--- /dev/null
+++ b/src/components/Playground/Output/Preview/render.scss
@@ -0,0 +1,6 @@
+[data-component=playground-output-preview-render] {
+  border: none;
+  height: 100%;
+  width: 100%;
+  flex: 1;
+}
\ No newline at end of file
diff --git a/src/components/Playground/Output/index.tsx b/src/components/Playground/Output/index.tsx
index 7325852..bf729b7 100644
--- a/src/components/Playground/Output/index.tsx
+++ b/src/components/Playground/Output/index.tsx
@@ -1,6 +1,6 @@
 import FlexBox from '@/components/common/FlexBox'
 import { IFiles, IImportMap } from '@/components/Playground/shared'
-import FileSelector from '@/components/Playground/CodeEditor/FileSelector'
+import Playground from '@/components/Playground'
 import Transform from '@/components/Playground/Output/Transform'
 import Preview from '@/components/Playground/Output/Preview'
 
@@ -8,14 +8,15 @@ interface OutputProps {
     files: IFiles
     selectedFileName: string
     importMap: IImportMap
+    entryPoint: string
 }
 
-const Output = ({ files, selectedFileName, importMap }: OutputProps) => {
+const Output = ({ files, selectedFileName, importMap, entryPoint }: OutputProps) => {
     const [selectedTab, setSelectedTab] = useState('Preview')
 
     return (
         <FlexBox data-component={'playground-code-output'}>
-            <FileSelector
+            <Playground.CodeEditor.FileSelector
                 files={{
                     Preview: { name: 'Preview', language: 'json', value: '' },
                     Transform: { name: 'Transform', language: 'json', value: '' }
@@ -29,6 +30,7 @@ const Output = ({ files, selectedFileName, importMap }: OutputProps) => {
                     iframeKey={JSON.stringify(importMap)}
                     files={files}
                     importMap={importMap}
+                    entryPoint={entryPoint}
                 />
             )}
             {selectedTab === 'Transform' && <Transform file={files[selectedFileName]} />}
diff --git a/src/components/Playground/compiler.ts b/src/components/Playground/compiler.ts
index d7a9bea..74cbaf9 100644
--- a/src/components/Playground/compiler.ts
+++ b/src/components/Playground/compiler.ts
@@ -2,7 +2,7 @@ import esbuild, { Loader, OnLoadArgs, Plugin, PluginBuild } from 'esbuild-wasm'
 import localforage from 'localforage'
 import axios from 'axios'
 import { IFiles, IImportMap } from '@/components/Playground/shared'
-import { cssToJs, ENTRY_FILE_NAME, jsonToJs, addReactImport } from '@/components/Playground/files'
+import { cssToJs, jsonToJs, addReactImport } from '@/components/Playground/files'
 
 class Compiler {
     private init = false
@@ -42,7 +42,7 @@ class Compiler {
             return esbuild.transform(code, { loader })
         })
 
-    compile = (files: IFiles, importMap: IImportMap, entryPoints: string[]) =>
+    compile = (files: IFiles, importMap: IImportMap, entryPoint: string) =>
         new Promise<void>((resolve) => {
             if (this.init) {
                 resolve()
@@ -57,11 +57,11 @@ class Compiler {
         }).then(() => {
             return esbuild.build({
                 bundle: true,
-                entryPoints: entryPoints,
+                entryPoints: [entryPoint],
                 format: 'esm',
                 metafile: true,
                 write: false,
-                plugins: [this.fileResolverPlugin(files, importMap, entryPoints)]
+                plugins: [this.fileResolverPlugin(files, importMap, entryPoint)]
             })
         })
 
@@ -72,13 +72,13 @@ class Compiler {
     private fileResolverPlugin = (
         files: IFiles,
         importMap: IImportMap,
-        entryPoints: string[]
+        entryPoint: string
     ): Plugin => {
         return {
             name: 'file-resolver-plugin',
             setup: (build: PluginBuild) => {
                 build.onResolve({ filter: /.*/ }, (args: esbuild.OnResolveArgs) => {
-                    if (entryPoints.includes(args.path)) {
+                    if (entryPoint === args.path) {
                         return {
                             namespace: 'OxygenToolbox',
                             path: args.path
@@ -165,10 +165,10 @@ class Compiler {
                 })
 
                 build.onLoad({ filter: /.*/ }, async (args: OnLoadArgs) => {
-                    if (args.path === ENTRY_FILE_NAME) {
+                    if (entryPoint === args.path) {
                         return {
                             loader: 'tsx',
-                            contents: addReactImport(files[ENTRY_FILE_NAME].value)
+                            contents: addReactImport(files[entryPoint].value)
                         }
                     }
 
diff --git a/src/components/Playground/index.tsx b/src/components/Playground/index.tsx
index 895ca03..44273ba 100644
--- a/src/components/Playground/index.tsx
+++ b/src/components/Playground/index.tsx
@@ -1,6 +1,7 @@
 import '@/components/Playground/playground.scss'
 import { IFiles, IImportMap, ITsconfig } from '@/components/Playground/shared'
 import {
+    ENTRY_FILE_NAME,
     IMPORT_MAP_FILE_NAME,
     MAIN_FILE_NAME,
     TS_CONFIG_FILE_NAME
@@ -13,9 +14,15 @@ interface PlaygroundProps {
     initFiles: IFiles
     initImportMapRaw: string
     initTsconfigRaw: string
+    entryPoint?: string
 }
 
-const Playground = ({ initFiles, initImportMapRaw, initTsconfigRaw }: PlaygroundProps) => {
+const Playground = ({
+    initFiles,
+    initImportMapRaw,
+    initTsconfigRaw,
+    entryPoint = ENTRY_FILE_NAME
+}: PlaygroundProps) => {
     const [files, setFiles] = useState(initFiles)
     const [selectedFileName, setSelectedFileName] = useState(MAIN_FILE_NAME)
     const [importMapRaw, setImportMapRaw] = useState<string>(initImportMapRaw)
@@ -93,7 +100,12 @@ const Playground = ({ initFiles, initImportMapRaw, initTsconfigRaw }: Playground
                 onChangeFileContent={handleOnChangeFileContent}
                 onSelectedFileChange={setSelectedFileName}
             />
-            <Output files={files} selectedFileName={selectedFileName} importMap={importMap!} />
+            <Output
+                files={files}
+                selectedFileName={selectedFileName}
+                importMap={importMap!}
+                entryPoint={entryPoint}
+            />
         </FlexBox>
     )
 }
diff --git a/src/pages/System/Tools/Base.tsx b/src/pages/System/Tools/Base.tsx
index f651653..ed1f268 100644
--- a/src/pages/System/Tools/Base.tsx
+++ b/src/pages/System/Tools/Base.tsx
@@ -32,8 +32,8 @@ import FitFullscreen from '@/components/common/FitFullscreen'
 import FlexBox from '@/components/common/FlexBox'
 import HideScrollbar from '@/components/common/HideScrollbar'
 import Card from '@/components/common/Card'
-import CodeEditor from '@/components/Playground/CodeEditor'
 import Permission from '@/components/common/Permission'
+import Playground from '@/components/Playground'
 
 const Base = () => {
     const blocker = useBlocker(
@@ -283,9 +283,11 @@ const Base = () => {
                                             duration: 0
                                         })
                                         void compiler
-                                            .compile(files, importMap, [
+                                            .compile(
+                                                files,
+                                                importMap,
                                                 compileForm.getFieldValue('entryFileName') as string
-                                            ])
+                                            )
                                             .then((result) => {
                                                 void message.destroy('compiling')
                                                 void message.loading({
@@ -982,7 +984,7 @@ const Base = () => {
                         </Card>
                         {editingFileName && (
                             <Card>
-                                <CodeEditor
+                                <Playground.CodeEditor
                                     files={editingFiles[editingBaseId]}
                                     selectedFileName={editingFileName}
                                     onSelectedFileChange={() => {}}
diff --git a/src/pages/System/Tools/Template.tsx b/src/pages/System/Tools/Template.tsx
index aa95a38..2fc3757 100644
--- a/src/pages/System/Tools/Template.tsx
+++ b/src/pages/System/Tools/Template.tsx
@@ -30,8 +30,8 @@ import FitFullscreen from '@/components/common/FitFullscreen'
 import FlexBox from '@/components/common/FlexBox'
 import HideScrollbar from '@/components/common/HideScrollbar'
 import Card from '@/components/common/Card'
-import CodeEditor from '@/components/Playground/CodeEditor'
 import Permission from '@/components/common/Permission'
+import Playground from '@/components/Playground'
 
 const Template = () => {
     const blocker = useBlocker(
@@ -866,7 +866,7 @@ const Template = () => {
                         </Card>
                         {editingFileName && (
                             <Card>
-                                <CodeEditor
+                                <Playground.CodeEditor
                                     files={editingFiles[editingTemplateId]}
                                     selectedFileName={editingFileName}
                                     onSelectedFileChange={() => {}}