swamp extension version throws Invalid CalVer version: "null" for an extension that has a prerelease version published (e.g. on the beta channel) but no stable version. It appears to feed the null stable latest-version straight into the CalVer parser instead of handling the no-stable case (falling back to the latest prerelease, or computing next from today's date).

Steps to reproduce

Publish an extension only to a prerelease channel: swamp extension push <manifest> --channel beta --yes (so the registry has latestBeta set but latestVersion/stable = null)
Ask for the next version: swamp extension version --manifest <manifest> --json

Actual

{
  "error": "Failed to look up version for @shrug/mercury: Invalid CalVer version: \"null\". Expected format [HOST-1] (e.g., \"2025.01.15.1\")"
}

swamp extension info @shrug/mercury --json confirms the state: "latestVersion": null, "latestBeta": "2026.07.18.3", "latestRc": null.

Earlier, before any publish (currentPublished null AND no prerelease), the same command returned a valid { currentPublished: null, nextVersion: "2026.07.19.1" } — so the null-stable case is only mishandled once a prerelease exists.

Expected

nextVersion should be computed even when only a prerelease exists — e.g. from the latest prerelease version and/or today's date — rather than passing the literal null stable version to the CalVer parser. At minimum, treat a null stable latestVersion as "no stable baseline" (as it already does when nothing is published at all).

Impact

Blocks the documented State 5 (versioned) publish-flow helper for any extension that follows the recommended beta→rc→stable promotion path: after a first beta publish you can no longer use swamp extension version to compute the next version. Workaround: bump the manifest version by hand.

Environment

swamp 20260716.194319.0-sha.df9fc306
Linux
First surfaced with local extensions @shrug/{mercury,invoiceninja,bank-import} published to the beta channel.

02Bog Flow

Shipped

7/19/2026, 7:44:58 PM

Click a lifecycle step above to view its details.

03Sludge Pulse

keeb assigned keeb7/19/2026, 6:28:20 PM

keeb commented 7/19/2026, 7:45:05 PM

Thanks @kneel for reporting this! The fix has been merged and a release is on its way. We appreciate your contribution to swamp.

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