import type { AnyRequest, Request } from './Request';
import type { HashMap } from '@principia/base/HashMap';
import type { _A, _E } from '@principia/base/prelude';
import type { URef } from '@principia/base/Ref';
import * as E from '@principia/base/Either';
import * as I from '@principia/base/IO';
import * as M from '@principia/base/Maybe';
export interface Cache {
    get<A extends AnyRequest>(request: A): I.FIO<void, URef<M.Maybe<E.Either<_E<A>, _A<A>>>>>;
    lookup<A extends AnyRequest>(request: A): I.UIO<E.Either<URef<M.Maybe<E.Either<_E<A>, _A<A>>>>, URef<M.Maybe<E.Either<_E<A>, _A<A>>>>>>;
    put<A extends AnyRequest>(request: A, result: URef<M.Maybe<E.Either<_E<A>, _A<A>>>>): I.UIO<void>;
}
export declare class DefaultCache implements Cache {
    private state;
    constructor(state: URef<HashMap<AnyRequest, any>>);
    get<E, A>(request: Request<E, A>): I.FIO<void, URef<M.Maybe<E.Either<E, A>>>>;
    lookup<E, A>(request: Request<E, A>): I.UIO<E.Either<URef<M.Maybe<E.Either<E, A>>>, URef<M.Maybe<E.Either<E, A>>>>>;
    put<E, A>(request: Request<E, A>, result: URef<M.Maybe<E.Either<E, A>>>): I.UIO<void>;
}
export declare const empty: I.UIO<Cache>;
//# sourceMappingURL=Cache.d.ts.map