Add an option to list "always available dependencies"

[ao-Barbosa]

Problem

Currently, fallow doesn't have a configuration to mark a dependency as always available, which can lead to known good dependencies being marked as unlisted.

A very easy example of this is bun: modules.

Proposed solution

Treat ignoreDependencies listed deps as both "always considered used" as well as "always considered available".

Alternatives considered

I see three alternative ways to approaching this:

1. Add bun: to a 'hard-coded' list of known goods, in the same way as node:.
2. Allow for a rule specific configuration (rules.unlistedDependencies.ignoreDependencies) object which serves as ignore.
3. Add a new configuration key "globalDependencies" or similar, for dependencies which aren't listed in the package but are known available in actual use.

[BartWaardenburg]

This has been addressed in v2.13.0 with two changes:

1. bun: built-in module support — All bun: prefixed imports (bun:sqlite, bun:test, bun:ffi, etc.) are now recognized as platform builtins, just like node: modules. They will never be flagged as unlisted dependencies.

2. ignoreDependencies now suppresses unlisted warnings — Previously it only marked packages as "always used" for unused-dependency detection. Now it also suppresses unlisted-dependency warnings, making it the right tool for runtime-provided packages that aren't in your package.json.

So for your use case, bun:sqlite will just work out of the box, and for other global/runtime-provided packages you can use ignoreDependencies to suppress both unused and unlisted warnings.

Could you update to v2.13.0 and verify this works for your setup?

[ao-Barbosa]

Confirmed, working.

Thank you!