How can we send messages main process to renderer process in Electron

To send a message back to the renderer you would use:

win.webContents.send('asynchronous-message', {'SAVED': 'File Saved'});

webContents.send Docs

alternatively - when you want to respond to an event received from renderer process you can do something like this:

     ipcMain.on("eventFromRenderer", (event) => {
          event.sender.send("eventFromMain", someReply);
     }

Source: https://electronjs.org/docs/api/ipc-main

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