import { HttpMessage } from "@http4t/core/contract";
import { MessageLens, RoutingResult } from "../lenses";
export declare class EmptyLens<TMessage extends HttpMessage> implements MessageLens<TMessage, undefined> {
    get(_message: TMessage): Promise<RoutingResult<undefined>>;
    set<SetInto extends TMessage>(into: SetInto, value: undefined): Promise<SetInto>;
}
export declare function empty<TMessage extends HttpMessage = HttpMessage>(): EmptyLens<TMessage>;
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