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(.module:
lux
(lux (data [text]
(coll [list "list/" Fold<List>]
(dictionary ["dict" unordered #+ Dict])))))
(type: #export Influences (Dict Text (List Text)))
(def: #export (track to from)
(-> Text Text Influences Influences)
(|>> (dict.update~ from (list) (|>> (#.Cons to)))
(dict.update~ to (list) id)))
(def: (effluents module influences)
(-> Text Influences (Maybe (List Text)))
(dict.get module influences))
(def: #export (untrack module influences)
(-> Text Influences Influences)
(case (effluents module influences)
(#.Some effluents)
(list/fold untrack (dict.remove module influences) effluents)
#.None
influences))
(def: #export empty Influences (dict.new text.Hash<Text>))
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