import { type Graph, type NodeId } from './graph.js';
import type { GraphOperationResult, ObserveOptions } from './operation.js';
export interface RemoveUnreachableOptions extends ObserveOptions {
    readonly preserve?: ReadonlySet<NodeId>;
}
export interface RemoveUnreachableResult extends GraphOperationResult {
    readonly removed: readonly NodeId[];
}
export declare function removeUnreachable(graph: Graph, options?: RemoveUnreachableOptions): RemoveUnreachableResult;