Why remove existing .npmignore?

[npalmius]

Hi,

This is a great little package. Just wondering why .npmignore is cleared out (with the exception of the temp directory) before running npm pack? This means that files that I want to keep out of the package (tsconfig, eslint, prettier & VS Code config files and TypeScript source files, for example) and therefore add to .npmignore get included. I'm sure there's a reason, but would be great if an existing .npmignore file (if it exists) could be updated, rather than replaced.