Electron.remote is undefined

Update 2020, since this answer still appears at the top. For the original answer to work in current versions of Electron, you need to set enableRemoteModule when creating the window in your main process.

const myWindow = new BrowserWindow({
    webPreferences: {
        enableRemoteModule: true
    }
}); 

Original answer:

remote is needed only to require other modules from inside a render process. In the main process you just get your modules directly from require('electron'). Which it looks like is done in the example just with remote unnecessarily added.

Render process:

const { remote } = require('electron');
const { BrowserWindow } = remote;

Main process:

const { BrowserWindow } = require('electron');

In electron 10.0.0, remoteModule is set false by default. So, if you want to use const {BrowserWindow, dialog } = require('electron').remote; in JavaScript file, then you must set enableRemoteModule as true in webPreferences.

const w = new BrowserWindow({
    webPreferences: {
        enableRemoteModule: true
    }
}); 

link: https://github.com/electron/electron/blob/master/docs/breaking-changes.md#default-changed-enableremotemodule-defaults-to-false

The remote module was deprecated in Electron 12, and will be removed in Electron 14. It is replaced by the @electron/remote module.

// Deprecated in Electron 12:
const { BrowserWindow } = require('electron').remote

// Replace with:
const { BrowserWindow } = require('@electron/remote')

// In the main process:
require('@electron/remote/main').initialize()