Vue-cli-plugin-electron-builder: Hot-Reload not working in background.js dependencies

[zzisu]

Describe the bug
Hot-Reload wont work when despondencies of background.js changed.

To Reproduce
Steps to reproduce the behavior:

// src/background.ts
'use strict'

import path from 'path'
import { app, protocol, BrowserWindow, Tray, Menu, Notification } from 'electron'
import { createProtocol, installVueDevtools } from 'vue-cli-plugin-electron-builder/lib'
import { getConfig } from './common/config'

const isDevelopment = process.env.NODE_ENV !== 'production'

protocol.registerSchemesAsPrivileged([{ scheme: 'app', privileges: { secure: true, standard: true } }])

let win: BrowserWindow | null

function createWindow () {
  ...
}

if (app.requestSingleInstanceLock()) {
  app.on('ready', async () => {
    ... // Install Vue Devtools
    const config = getConfig()
    if (!config.hideOnStart) {
      createWindow()
    }
  })
  ...
} else {
  app.quit()
}

// src/common/config.ts

export function getConfig(){
  ...
}

Edit src/common/config.ts, but the background process wont be reloaded
Expected behavior
background process should be reloaded after its dependencies updated

Screenshots

Environment (please complete the following information):

• OS and version: Microsoft Windows [Version 10.0.18363.778]
• node version: v14.2.0
• npm version: 6.14.4
• yarn version (if used): 1.22.4
• vue-cli-plugin-electron-builder version : ^1.4.6
• electron version: 8.2.5 (but the bug happens on all electron versions!)
• other vue plugins used: babel, eslint, router, typescript, vuetify
• custom config for vcp-electron-builder: https://github.com/ZhangZisu/classroom-helper/blob/master/vue.config.js
• (if possible) link to your repo: https://github.com/ZhangZisu/classroom-helper

[nklayman]

You need to add the file to the mainProcessWatch array in vue.config.js:
```js
// vue.config.js

module.exports = {
pluginOptions: {
electronBuilder: {
// Provide an array of files that, when changed, will recompile the main process and restart Electron
// Your main process file will be added by default
mainProcessWatch: ['src/myFile1', 'src/myFile2'],
}
}
}