Write file and then upload to cloud storage - NodeJS - node.js

Question

I'm trying to upload a file to my bucket after it's written but I'm not sure how to do it.
I confirm that code to write the file is ok as I tested it locally and it's working normally.
bucket.upload doesn't seem to work as the file is saved locally.
bucket.file.save is also not working
the file is saved at "./public/fileName.xlsx".
When I use:
storage.bucket("bucketName").file("bucketFileName").save("./public/fileName.xlsx")
There's indeed a file been uploaded to the storage, but its content is the path string that I'm passing inside .save()
So to resume my question is: How do I write a file and then upload it to my bucket?
ps: the file is an excel worksheet

Answer 1

If you confirmed that the file is saved locally and just want to upload it to the bucket, you may refer to the sample code below:
const {Storage} = require('#google-cloud/storage');
const storage = new Storage();
// Change to your bucket name
const bucketName = 'bucket-name';
async function uploadFile(path, filename) {
// Path where to save the file in Google Cloud Storage.
const destFileName = `public/${filename}`;
const options = {
destination: destFileName,
// Optional:
// Set a generation-match precondition to avoid potential race conditions
// and data corruptions. The request to upload is aborted if the object's
// generation number does not match your precondition. For a destination
// object that does not yet exist, set the ifGenerationMatch precondition to 0
// If the destination object already exists in your bucket, set instead a
// generation-match precondition using its generation number.
preconditionOpts: {ifGenerationMatch: generationMatchPrecondition},
};
// The `path` here is the location of the file that you want to upload.
await storage.bucket(bucketName).upload(path, options);
console.log(`${path} uploaded to ${bucketName}`);
}
uploadFile('./public/fileName.xlsx', 'fileName.xlsx').catch(console.error);
Added some comments on the sample code.
For more information, you may check this documentation.