RelationGraph.appended_source: def of bendvy-ecs-core@0.1.0.3
Import: import bendvy-ecs-core@0.1.0.3/relation_graph.bend as RelationGraph
Lines 80-83 of bendvy-ecs-core@0.1.0.3/relation_graph.bend: https://jend.leeeet.dev/read.txt?path=bendvy-ecs-core@0.1.0.3/relation_graph.bend&start_line=80&end_line=83

import Base
import entity_key.bend as K

def appended_source(present: Bool,sources: List<&2,K.Key>,source: K.Key) -> List<&2,K.Key>:
  match present:
    case True{}: sources
    case False{}: List.append(&2,K.Key,sources,[source])

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.append
  https://jend.leeeet.dev/definition.txt?path=bendvy-ecs-core@0.1.0.3/entity_key.bend&name=Key