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3. Create and publish a package

Create a library:

Terminal window
longbow new archer-words --lib
cd archer-words

Export a small function from its declared module, add a paired _test.fl module, and run longbow test. The package ecosystem contract explains manifest identity, aliases, immutable versions, compatibility ranges, and credentials in full.

Before any upload, qualify the exact archive:

Terminal window
longbow check
longbow test
longbow build
longbow publish --dry-run

The dry run validates the manifest and reports normalized files and a SHA-256 checksum without contacting the registry. A real published version is immutable. Increment the version for a correction; yank only to prevent new unlocked resolutions from selecting a bad version.

Applications import a dependency through their local alias, such as lib::words::greeting, rather than through its registry owner. Commit longbow.lock for applications so CI resolves the same bytes.

Track complete

Section titled “Track complete”

You can now create, run, diagnose, and package a small application. Continue to Basic: modules, values, and functions. Use Longbow as the command reference.