launcher/app/main/windows/lib/preload.js

// All of the Node.js APIs are available in the preload process.
// It has the same sandbox as a Chrome extension.
const {ipcRenderer} = require('electron')

window.api = [
    "showSuspensionWindow",
    "resizeWindow",
    "setUnReadMessage",
    "getUnReadMessage",
    "windowMoveHandle",
    "exitSystem",
    "openDevTools",
    "hideMainWindow",
    "showMainWindow",
    "minimize",
    "hideSuspensionWindow"
].reduce((acc, apiName) => {
    acc[apiName] = (...params) => {
        return ipcRenderer.send(apiName, ...params)
    }
    return acc
}, {
    on: ipcRenderer.on.bind(ipcRenderer),
    send: ipcRenderer.send.bind(ipcRenderer),
    removeListener: ipcRenderer.removeListener.bind(ipcRenderer)
});

ipcRenderer.on('getUnReadMessage', (e, args) => {
    window.getUnReadMessage(args[0]);
});
window.addEventListener("keydown", e => {
    const {altKey, ctrlKey, keyCode} = e;
    if (altKey && ctrlKey && keyCode === 70) {
        const currentWindow = require('electron').remote.getCurrentWindow();
        currentWindow && currentWindow.toggleDevTools();
        e.preventDefault();
    }
})