import { HttpMessage } from "@http4t/core/contract";
import { MessageLens, RoutingResult } from "../lenses";
/**
 * NB: does not _check_ `Content-Type` header when extracting, but does
 * _set_ it when injecting
 *
 * Uses {@link JsonBody} to avoid deserialising twice.
 */
export declare class JsonLens<T> implements MessageLens<HttpMessage, T> {
    get(message: HttpMessage): Promise<RoutingResult<T>>;
    set<SetInto extends HttpMessage>(into: SetInto, value: T): Promise<SetInto>;
}
export declare function json<T extends object>(): MessageLens<HttpMessage, T>;
//# sourceMappingURL=JsonLens.d.ts.map