javascript - 从Google存储桶读取图像并使用Sharp进行转换失败

我正在尝试从Firebase函数中的Google Cloud Storage Bucket中读取图像，并使用如下所示的Sharp Library提取其中的一部分

const bucket = admin.storage().bucket('XXX.appspot.com')
const filePath = '1558520481853'

   const pipeline = sharp().extract({ left: 0, top: 0, width: 30, height: 30 }).toBuffer().then(
       (data:any) =>
                    console.log("data is::::" + data)
   );

    bucket.file(filePath).createReadStream().pipe(pipeline);

这失败并出现错误

TypeError: dest.on is not a function
    at DestroyableTransform.Readable.pipe (/srv/node_modules/through2/node_modules/readable-stream/lib/_stream_readable.js:590:8)
    at Object.<anonymous> (/srv/lib/index.js:49:46)
    at Generator.next (<anonymous>)
    at /srv/lib/index.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/srv/lib/index.js:3:12)
    at exports.extract_text_from_bounding_box.functions.https.onRequest (/srv/lib/index.js:39:82)
    at cloudFunction (/srv/node_modules/firebase-functions/lib/providers/https.js:49:9)
    at /worker/worker.js:783:7
    at /worker/worker.js:766:11
    at _combinedTickCallback (internal/process/next_tick.js:132:7)
    at process._tickDomainCallback (internal/process/next_tick.js:219:9)

我正在跟踪样本https://github.com/firebase/functions-samples/blob/master/image-sharp/functions/index.js，该样本正在写回到我不需要的存储桶，只需要提取图像的base64

最佳答案

错误是在“管道”方法上。

在这行上：

 bucket.file(filePath).createReadStream().pipe(pipeline);

尝试这个：

 bucket.file(filePath).createReadStream().pipe(pipeline());

关于javascript - 从Google存储桶读取图像并使用Sharp进行转换失败，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/57350814/