const bucket = admin.storage().bucket(fileBucket);

const metadata = {
  contentType: contentType,
};

const downloadResponse = await bucket.file(filePath).download();

const imageBuffer = downloadResponse\[0\];

functions.logger.log("Image downloaded!");

// Generate a thumbnail using sharp.

const thumbnailBuffer = await sharp(imageBuffer).resize({
  width: 200,
  height: 200,
  withoutEnlargement: true,
}).toBuffer();

functions.logger.log("Thumbnail created");

// Upload the thumbnail with a 'thumb\_' prefix.
const thumbFileName = thumb\ _$ {
  fileName
};

const thumbFilePath = path.join(path.dirname(filePath), thumbFileName);

await bucket.file(thumbFilePath).save(thumbnailBuffer, {
  metadata: metadata,
});

return functions.logger.log("Thumbnail uploaded!");
});

字符串
我尝试了以下解决方案

// Download file from bucket.
const bucket = admin.storage().bucket(fileBucket);
const metadata = {
  contentType: contentType,
};
const downloadResponse = await bucket.file(filePath).download();
const imageBuffer = downloadResponse\[0\];
functions.logger.log("Image downloaded!");

// Generate a thumbnail using sharp.
const thumbnailBuffer = await sharp(imageBuffer).resize({
  width: 200,
  height: 200,
  withoutEnlargement: true,
}).toBuffer();
functions.logger.log("Thumbnail created");

// Upload the thumbnail with a 'thumb\_' prefix.
const thumbFileName = thumb\ _$ {
  fileName
};
const thumbFilePath = path.join(path.dirname(filePath), thumbFileName);
await bucket.file(thumbFilePath).save(thumbnailBuffer, {
  metadata: metadata,
});
return // potential bucket file image url;

型