How to get the final encrypted zip file (with or without compression)

[sntran]

Is there a way to get a calculated final size before creating a zip archive for a file with known size? The archive would be encrypted with password, but does not need to be compressed.

[gildas-lormeau]

This is not possible if entries are compressed. The total size can be computed for zip files with uncompressed entries though. However, zip.js doesn't offer a function for this, as it isn't necessary.

[sntran]

Yes, I mean with uncompressed entries.

Are you open to add such a functionality? Some other tools requires to know the size beforehand, and I would love to be able to stream zip file to them.