电子：（js）blob wav到main.js，以便从renderer.js保存到磁盘

问：

我在preload.js：

const { contextBridge, ipcRenderer } = require('electron')
// Toutes les API Node.js sont disponibles dans le processus de préchargement.
// Il a la même sandbox qu'une extension Chrome.
window.addEventListener('DOMContentLoaded', () => {
  const replaceText = (selector, text) => {
    const element = document.getElementById(selector)
    if (element) element.innerText = text
  }

  for (const dependency of ['chrome', 'node', 'electron']) {
    replaceText(`${dependency}-version`, process.versions[dependency])
  }

})
contextBridge.exposeInMainWorld(
"api", {
        send: (channel, data) => {
            // whitelist channels
            let validChannels = ["toMain"];
            if (validChannels.includes(channel)) {
                ipcRenderer.send(channel, data);
            }
        },
        receive: (channel, func) => {
            let validChannels = ["fromMain",'fromparam'];
            if (validChannels.includes(channel)) {
                // Deliberately strip event as it includes `sender` 
                ipcRenderer.on(channel, (event, ...args) => func(...args));
            }
        },
        contextmenu: (channel, data) => {
            // whitelist channels
            let validChannels = ["showmenu"];
            if (validChannels.includes(channel)) {
                ipcRenderer.send(channel,'showmenu')
            }
        }
    }
)

我创建了一个“audio/wav”哑剧类型的 blob 我在index.html中这样做：：

window.api.send("toMain", "saveAudioObjet;"+(audioDirectory+"exports/"+tableObjet[obj].id+".wav")+";"+blob) 

我在main.js有这个： （通过 ipcMain.on （“toMain” ...

function saveAudioObjet(dest,buf) {

 fs.writeFile(dest, 
        Buffer.from(buf), function (err) {
            if (err) throw err;
            console.log('Saved!')
        })
}

如何将此 blob 保存到磁盘（dest is filePath， buf the blob）？