Feature Request: support save file to local disk file

[ruoyewu]

I tried to use the code below to save something to local disk file,

    const saveFile = async (name: string, content: string) => {
        printToConsole('start to save file');
        const blob = new Blob([content], { type: 'text/plain' });
        printToConsole(await blob.text());
        const a = document.createElement('a');
        printToConsole(a);
        a.href = URL.createObjectURL(blob);
        a.download = name + '.md';
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
    }

but it dost work.
Is this not supported or there are problems with the code?