a '{event}' before-handler rejected; the action was cancelled.

Warnings reference › kanban:beforeReject:*

Identifier

kanban:beforeReject:*

Raised by

Kanban

Since

1.36.0

What happened

An asynchronous before-handler returned a promise that rejected. The board waits for every deferred handler and treats a rejection as a veto, so the action was cancelled and the reason reported.

The fix

The rejection reason is attached to the console line. Resolve false to veto; resolve anything else to allow.

The smallest fix

board.on('beforeMove', async (e) => (await mayMove(e)) !== false);

Reference

Covered in full at the API reference.