chore: fix build by using yarn instead of pnpm

src/main/index.ts

@@ -52,6 +52,12 @@ function createWindow(): void {
   }
 }
 
+if (is.dev) {
+  process.env.NODE_ENV = 'development'
+} else {
+  process.env.NODE_ENV = 'production'
+}
+
 // This method will be called when Electron has finished
 // initialization and is ready to create browser windows.
 // Some APIs can only be used after this event occurs.
@@ -196,8 +202,9 @@ if (lastOpenDir) {
   prepareAndSendDir(lastOpenDir)
 }
 
-// Initially setup watcher for 'hello.md'
-setupWatcher(lastFilePath ?? path.resolve(__dirname, '../../../hello.md'))
+if (lastFilePath) {
+  setupWatcher(lastFilePath)
+}
 
 function getFilesRecursive(
   directory: string,

src/renderer/src/components/view/view.tsx

@@ -29,10 +29,11 @@ export const View = ({ setFileName }) => {
 
   useEffect(() => {
     const contentListener: IpcRendererListener = (_event, content) => {
-      setCode(content.code)
-      setFileName(content.fileName)
-      setSelectedFile(content.fileName)
-      setToc(content.toc)
+      if (!content) return
+      setCode(content?.code)
+      setFileName(content?.fileName)
+      setSelectedFile(content?.fileName)
+      setToc(content?.toc)
     }
 
     const directoryContentsListener: IpcRendererListener = (_event, content) => {