Tile.Level/TileManor/scripts/electron/preload.js

const { contextBridge, ipcRenderer } = require('electron')

contextBridge.exposeInMainWorld(
  'electron',
  {
    send: (channel, data1, data2) => {
      // whitelist channels
      let validChannels = ['parse-csv', 'get-file-list', 'open-newlv-prompt', 'open-newinst-prompt', 'save2csv'];
      if (validChannels.includes(channel)) {
        ipcRenderer.send(channel, data1, data2);
      }
    },
    receive: (channel, func) => {
      let validChannels = ['csv-data', 'file-list-data', 'file-list-error', 'prompt-newlv-reply', 'prompt-newinst-reply'];
      if (validChannels.includes(channel)) {
        // Deliberately strip event as it includes `sender` 
        ipcRenderer.on(channel, (event, ...args) => func(...args));
      }
    }
  }
);