import { Stream } from '@rimbu/stream';
import type { LinkType } from './traverse-base.mjs';
import type { VariantGraphBase } from '@rimbu/graph/custom';
/**
 * Returns a stream of connections that can be reached in the given `graph`
 * starting at the given `startNode`, and using breadth-first traversal. It can
 * avoid loops if needed in a custom way by supplying the `addVisitedNode` function.
 * @param graph - the graph to traverse
 * @param startNode - the start node within the graph
 * @param addVisitedNode - a function taking the currenty traversed node,
 * and returning true if the node has been traversed before, or false otherwise
 * @example
 * ```ts
 * const g = EdgeGraphHashed.of([1, 2], [2, 3], [1, 3], [3, 4])
 * const stream = traverseBreadthFirstCustom(g, 1)
 * console.log(stream.toArray())
 * // => [[1, 2], [1, 3], [2, 3], [3, 4]]
 * ```
 */
export declare function traverseBreadthFirstCustom<G extends VariantGraphBase<N, any>, N>(graph: G, startNode: N, addVisitedNode?: (node: N) => boolean): Stream<LinkType<G, N>>;
/**
 * Returns a stream of connections that can be reached in the given `graph`
 * starting at the given `startNode`, and using breadth-first traversal. It avoids
 * loops by internally placing the visited nodes in a HashSet builder.
 * @param graph - the graph to traverse
 * @param startNode - the start node within the graph
 * @example
 * ```ts
 * const g = EdgeGraphHashed.of([1, 2], [2, 3], [1, 3], [3, 4])
 * const stream = traverseBreadthFirstHashed(g, 1)
 * console.log(stream.toArray())
 * // => [[1, 2], [1, 3], [2, 3], [3, 4]]
 * ```
 */
export declare function traverseBreadthFirstHashed<G extends VariantGraphBase<N, V>, N, V>(graph: G, startNode: N): Stream<LinkType<G, N>>;
/**
 * Returns a stream of connections that can be reached in the given `graph`
 * starting at the given `startNode`, and using breadth-first traversal. It avoids
 * loops by internally placing the visited nodes in a SortedSet builder.
 * @param graph - the graph to traverse
 * @param startNode - the start node within the graph
 * @example
 * ```ts
 * const g = EdgeGraphHashed.of([1, 2], [2, 3], [1, 3], [3, 4])
 * const stream = traverseBreadthFirstSorted(g, 1)
 * console.log(stream.toArray())
 * // => [[1, 2], [1, 3], [2, 3], [3, 4]]
 * ```
 */
export declare function traverseBreadthFirstSorted<G extends VariantGraphBase<N, any>, N>(graph: G, startNode: N): Stream<LinkType<G, N>>;