How to debug .npmignore?

Question

How can package files (these to be published) be listed to debug records in .npmignore?

I'm looking for something like equivalent of git ls-files for .gitignore.

The only way I have found so far is to pack the package and then list the archive which I find a bit clumsy:

npm pack
tar -tzf <package-id>.tgz

Answer 1

As Mike 'Pomax' Kamermans mentioned in comment the fact that .npmignore and .gitignore use the same syntax can be leveraged:

git ls-files -co --exclude-per-directory=.npmignore

The command above lists exactly files that are not npm-ignored according to .npmignore file. (On top of that npm automatically ignores some other entries like node_modules.)

Git ls-files command generally lists combinations of files in working directory and index.

• -c option says show cached files
• -o show 'other', i.e. untracked files
• --exclude-per-directory=.npmignore use .npmignore as name of files of ignore entries

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EDIT: Since the approach above has bunch of exceptions - files that will never or always included regardless of content of the .npmignore - I find it unreliable. Following command is heavyweight but reliable:

file_name=$(npm pack) && tar -ztf $file_name && rm $file_name

It packages the project, lists package files and at the end removes created package.

Answer 2

npm pack --dry-run prints out what will be included

logger ❯ npm pack --dry-run
npm notice
npm notice 📦  @supercollider.js/[email protected]
npm notice === Tarball Contents ===
npm notice 817B  package.json
npm notice 199B  README.md
npm notice 1.7kB lib/index.d.ts
npm notice 693B  lib/index.d.ts.map
npm notice 3.9kB lib/index.js
npm notice 2.9kB lib/index.js.map
npm notice === Tarball Details ===
npm notice name:          @supercollider.js/logger
npm notice version:       1.0.0
npm notice filename:      supercollider.js-logger-1.0.0.tgz
npm notice package size:  3.0 kB
npm notice unpacked size: 10.2 kB
npm notice shasum:        6c60400e1d61723ce3d7705bb3a8a9a907b7d83b
npm notice integrity:     sha512-+1tQZMPQr3cAp[...]zPu6R/BqYdIJQ==
npm notice total files:   6
npm notice
supercollider.js-logger-1.0.0.tgz