Function create 

pub fn create(opts: &CreateOptions) -> Result<CreateReport, PackError>

Pack a project root into a single archive.

Arguments

• opts — Source root, destination path, and compression level.

Returns

A CreateReport carrying the manifest — including everything that was deliberately skipped — so the caller can report it without re-reading the archive.

Errors

• PackError::NotADirectory if the root is not a directory.
• PackError::Io on any read or write failure.
• PackError::ManifestSerialize if the manifest cannot be serialized.