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I am using Vue CLI 3 and vue-cli-plugin-electron-builder to package my Vue Electron app and I am not able to get my preload.js script for electron working.

main window

win = new BrowserWindow({
  width: 800,
  height: 600
  webPreferences: {
    nodeIntegration: false,
    preload: path.join(__dirname, "/../src/preload.js") // works but window.electron.dialog in undefined
preload.js
const { dialog } = require("electron");
window.electron = {};
window.electron.dialog = dialog;
The window.electron.dialog is always undefined in my Vue component - the import is clearly not working. Note that window.electron is defined properly. I must be missing something.
Add the following lines into the file vue.config.js , if the file does not exist create one in the root folder of your project
module.exports = {
 //...
 pluginOptions: {
  electronBuilder: {
    preload: 'src/preload.js',
    // Or, for multiple preload files:
    // preload: { preload: 'src/preload.js', otherPreload: 'src/preload2.js' }
 //...
Check the documentation for more #preload-files
The solution was more simple than expected. Imports work in window.onload event.
window.onload = () => {
  const { dialog } = require("electron").remote;
  window.electron = {};
  window.electron.dialog = dialog; // now set properly
        
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