yochananmarqos [1] filed a deletion request for slap [2]: Depends on nodejs-lts-boron=6.9.4 which hasn't existed for years. Upstream has seen no activity since 2016.
[1] https://aur.archlinux.org/account/yochananmarqos/ [2] https://aur.archlinux.org/pkgbase/slap/
