I have an electron-forge setup that I want to add electron-serve to.

I tried creating a /renderer directory and putting an index.html in it and using this code

const loadURL = serve({ directory: "renderer" });

const createWindow = () => {
    const mainWindow = new BrowserWindow({
        width: 1600,
        height: 800,
        webPreferences: {
            nodeIntegration: true,
            contextIsolation: false,
        },
    });

    // and load the index.html of the app.
    // original electron-forge command
    // mainWindow.loadURL(MAIN_WINDOW_WEBPACK_ENTRY)
    loadURL(mainWindow);

    // Open the DevTools.
    // mainWindow.websContents.openDevTools();
};

But I end up with

UnhandledPromiseRejectionWarning: Error: ERR_FILE_NOT_FOUND (-6) loading 'app://-/'
    at rejectAndCleanup (electron/js2c/browser_init.js:217:1457)
    at Object.failListener (electron/js2c/browser_init.js:217:1670)
    at Object.emit (events.js:315:20)

Am I missing something simple?