@dillonkearns/elm-graphql/examples/src/subscription/node_modules/flow-static-land/lib/Functor.js.flow

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// @flow
import { HKT } from './HKT'

export interface Functor<F> {
  map<A, B>(f: (a: A) => B, fa: HKT<F, A>): HKT<F, B>
}

export function lift<F, A, B>(functor: Functor<F>, f: (a: A) => B): (fa: HKT<F, A>) => HKT<F, B> {
  return fa => functor.map(f, fa)
}