import * as O from "../Option"
/**
 * Atomically modifies the `FiberRef` with the specified partial function and
 * returns the old value.
 * If the function is undefined on the current value it doesn't change it.
 */
export declare const getAndUpdateSome: <A>(
  f: (a: A) => O.Option<A>
) => (fiberRef: import("./fiberRef").FiberRef<A>) => import("../Effect").UIO<A>
//# sourceMappingURL=getAndUpdateSome.d.ts.map
