Export an array from NodeJS directly to amazon S3 without first saving it locally?

Question

This is the working flow of my application:

1. Get the data from sources.
2. Perform some operations.
3. Save the data on a csv file created locally.
4. After the completion, upload the csv to S3 and delete the local file.

However, when I tried to deploy this application in heroku, I get an error in writeFileSync and cannot create files. To tackle that, I want to store the csv values in a nested array, and then upload directly to S3 as a csv file without local interference.

How do I achieve this? If there are better approaches, please do mention.