import type { ParjsCombinator, UserState } from "../../index";
/** A user state object or a projection to the external user state. */
export type UserStateOrProjection = UserState | ((externalState: UserState) => UserState);
/**
 * When the source parser is applied, the user state will be switched for a different object. After
 * it has finished, the previous user state will be restored. This effectively isolates the source
 * parser's user state.
 *
 * If the given paramter is a function, it will be called on the pre-existing user state to
 * determine the new user state. If it's a non-fuction object, it will be used as the user state
 * instead.
 *
 * @param innerStateOrCtor The new internal user state or a projection on the existing user state.
 */
export declare function replaceState<T>(innerStateOrCtor: UserStateOrProjection): ParjsCombinator<T, T>;
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