Wonder-Technology/Wonder.js

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src/construct/domain_layer/library/structure/utils/NullUtils.res

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let isEmpty = value =>
  value === Obj.magic(Js.Nullable.null) || value === Obj.magic(Js.Nullable.undefined)

let isNotInMap = value => value === Js.Nullable.undefined

let isInMap = value => value !== Js.Nullable.undefined