Disable SourceKit via command line argument

[enekox]

New Issue Checklist

• I've Updated SwiftLint to the latest version.
• I've searched for existing GitHub issues.

Feature or Enhancement Proposal

0.61.0 released added the option to disable SourceKit when the environment variable SWIFTLINT_DISABLE_SOURCEKIT is defined.

However, in some cases, it might not be trivial to configure this environment variable.

While SourceKit is being completely removed, it would be great if meanwhile we had the option to pass a regular flag (eg --disable-sourcekit or --no-sourcekit) to disable SourceKit.

Thank you!

[SimplyDanny]

What would be the situations where it isn't possible to configure it? I'm especially thinking about making the call just SWIFTLINT_DISABLE_SOURCEKIT=1 swiftlint ....

If we're talking about Linux, you know that there are also special builds that don't require SourceKit and therefore work without any Swift toolchain preinstalled?

[enekox]

For example, if SwiftLint is run as a subprocess by some tooling that overrides the environment, and devs have no access to change that environment.

Specific details don't matter, it's a matter of making it more flexible. Thanks!

[enekox]

Would be really helpful if this was implemented, currently stuck not being able to disable SourceKit on Xcode 26 🙏