OptionaloutputsNamed output ports. Defaults to a single out of output type; a
multi-output node (e.g. Split) lists each with a component accessor.
OptionalhelpersModule-scope WGSL helper functions this node needs (emitted once, deduped
per node kind, before surface()).
Type of the node's primary value (the
let n_id = …), or null for the terminal Output node.