import { Effect } from "effect";
import type { AstNode } from "./model.js";
export type IteratorCursor<R> = {
    readonly next: Effect.Effect<{
        readonly done: boolean;
        readonly value: unknown;
    }, unknown, R>;
    readonly close: Effect.Effect<void, unknown, R>;
};
export type SyncIteratorRunner<R> = {
    readonly syncIterator: (value: unknown, node: AstNode) => Effect.Effect<IteratorCursor<R> | undefined, unknown, R>;
};
export declare const preserveConsumerError: <A, R>(cursor: IteratorCursor<R>, effect: Effect.Effect<A, unknown, R>) => Effect.Effect<A, unknown, R>;