How to use ES8 async/await with streams?

Question

In https://stackoverflow.com/a/18658613/779159 is an example of how to calculate the md5 of a file using the built-in crypto library and streams.

var fs = re         


        

Answer 1

Something like this works:

for (var res of fetchResponses){ //node-fetch package responses
    const dest = fs.createWriteStream(filePath,{flags:'a'});
    totalBytes += Number(res.headers.get('content-length'));
    await new Promise((resolve, reject) => {
        res.body.pipe(dest);
        res.body.on("error", (err) => {
            reject(err);
        });
        dest.on("finish", function() {
            resolve();
        });
    });         
}