How to send a result to sender via contextBridge / IPCRenderer? - electron

Question

I have a electron that looks like this
const { contextBridge, ipcRenderer } = require('electron');
contextBridge.exposeInMainWorld('electron', {
electronStore: {
get(val) {
ipcRenderer.send('electron-store-get', val);
},
set(property, val) {
ipcRenderer.send('electron-store-set', property, val);
},
// Other method you want to add like has(), reset(), etc.
},
});
and ipcMain that looks like this
ipcMain.on('electron-store-get', async (event, val) => {
store.get(val);
// console.log(reply);
// return reply;
// event.reply('electron-store-get', reply);
});
ipcMain.on('electron-store-set', async (event, property, val) => {
// console.log(val);
store.set(property, val);
});
When I was trying to call the function via electron.electronStore.get(), it returns undefined
let a = window.electron.electronStore.get('test');
console.log(a);
However, I've tested that on the line of ipcRenderer.send(""), I was able to receive data by setting as below
let result = ipcRenderer.send('electron-store-get',val);
console.log(result);
Which mean, ipcRenderer is not undefined and set has been successfuly, get as-well, just it went missing when i invoke the ipcMain Get functions

Answer 1

Your current preload API isn't actually returning anything:
get(val) {
ipcRenderer.send('electron-store-get', val);
}
You'll want to either use the synchronous API: return ipcRenderer.sendSync('electron-store-get', val) and then have your handler in main do:
ipcMain.on('electron-store-get', (event, val) => {
event.returnValue = store.get(val);
});
Or make the preload API async:
get(val) {
return ipcRenderer.invoke('electron-store-get', val);
}
ipcMain.handle('electron-store-get', (event, val) => {
return store.get(val);
});
And then:
let a = await window.electron.electronStore.get('test');