custom document backend implemented

electron/main/preload.js

@@ -30,6 +30,18 @@ try {
         file_download: () => {ipcRenderer.send("file_download")}
     })
 
+
+
+    //documenttypes 
+
+    contextBridge.exposeInMainWorld('api', {
+         getTxtFiles: () => ipcRenderer.invoke('get-txt-files'),
+         saveTxtFile: (name, content) =>
+         ipcRenderer.invoke('save-txt-file', name, content),
+         readTxtFile: (fileName) =>
+         ipcRenderer.invoke('read-txt-file', fileName)
+    });
+
     
     ipcRenderer.on("error", (event, err) => {alert(err)})
 } catch (error) {