The affected node id, regardless of whether the effect is plain or linked.
Whether the effect carries a LinkTo target (i.e., is the object variant).
The LinkTo target of the effect, or undefined if it is a plain (unlinked) one.
Readonlyname: "UnknownSideEffect"
Helpers for the UnknownSideEffect union, which is either a plain NodeId or a
{ id, linkTo }object. Use these instead of hand-rollingtypeof x === 'object' ? x.id : xchecks so the object/non-object discrimination lives in one place.