/**
 * A {@link LayeringTopological} that assigns each node a unique layer.
 *
 * @packageDocumentation
 */
import type { Rank } from "../../graph";
import { type U } from "../../utils";
import type { Layering } from ".";
/** topological operators */
export interface LayeringTopologicalOps<in N = never, in L = never> {
    /** rank operator */
    rank: Rank<N, L>;
}
/** the node datum of a set of operators */
type OpsNodeDatum<Ops extends LayeringTopologicalOps> = Ops extends LayeringTopologicalOps<infer N, never> ? N : never;
/** the link datum of a set of operators */
type OpsLinkDatum<Ops extends LayeringTopologicalOps> = Ops extends LayeringTopologicalOps<never, infer L> ? L : never;
/**
 * a layering that assigns every node a distinct layer
 *
 * This combined with topological coordinate assignment can be thought of as an
 * alternative to {@link zherebko}. The latter generally produces more pleasing
 * layouts, but both are options.  This layering is very fast, but it may make
 * other steps take longer due to the many created dummy nodes.
 *
 * Create with {@link layeringTopological}.
 */
export interface LayeringTopological<Ops extends LayeringTopologicalOps = LayeringTopologicalOps> extends Layering<OpsNodeDatum<Ops>, OpsLinkDatum<Ops>> {
    /**
     * set the {@link Rank}
     *
     * Nodes will first be in rank order, and then in topological order
     * attempting to minimize edge inversions.
     */
    rank<NewRank extends Rank>(newRank: NewRank): LayeringTopological<U<Ops, "rank", NewRank>>;
    /**
     * get the current {@link Rank}.
     */
    rank(): Ops["rank"];
    /** @internal flag indicating that this is built in to d3dag and shouldn't error in specific instances */
    readonly d3dagBuiltin: true;
}
/** default topological operator */
export type DefaultLayeringTopological = LayeringTopological<{
    /** unconstrained rank */
    rank: Rank<unknown, unknown>;
}>;
/**
 * create a default {@link LayeringTopological}
 *
 * This is a layering that assigns every node to a distinct layer.
 *
 * @example
 *
 * ```ts
 * const layout = sugiyama().layering(layeringTopological());
 * ```
 */
export declare function layeringTopological(...args: never[]): DefaultLayeringTopological;
export {};