Lintian tag information: package-contains-npm-ignore-file (type: error)

Description (from lintian-explain-tags)

The package ships an .npmignore file. It is a configuration file for the
Node.js package manager. It is not needed in a Debian package.

The file tells the npm command to keep files out of a node package. Please
remove it from your package.

Visibility: error
Show-Always: no
Check: files/names

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