import type { Tree } from "./model";
export declare const extend_: <A, B>(wa: Tree<A>, f: (wa: Tree<A>) => B) => Tree<B>;
export declare const extend: <A, B>(f: (wa: Tree<A>) => B) => (wa: Tree<A>) => Tree<B>;
export declare const duplicate: <A>(wa: Tree<A>) => Tree<Tree<A>>;
export declare const extract: <A>(wa: Tree<A>) => A;
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