export type ValveNodeKind = 'supply' | 'gate' | 'faucet';
export interface ValveGraphNode {
    readonly id: string;
    readonly kind: ValveNodeKind;
}
/**
 * `crossing` — a producer delivers to a faucet. `context` — a gate's enrichment
 * depends on an inbound valve. `retraction` — a superseded crossing invalidates
 * the downstream it fed.
 */
export type ValveEdgeKind = 'crossing' | 'context' | 'retraction';
export interface ValveGraphEdge {
    readonly kind: ValveEdgeKind;
    readonly from: string;
    readonly to: string;
}
/** The directional data-dependency graph, distinct from the package graph. */
export interface ValveGraph {
    readonly nodes: readonly ValveGraphNode[];
    readonly edges: readonly ValveGraphEdge[];
}
/** Assemble the valve graph from every registered valve and faucet. */
export declare function buildValveGraph(): ValveGraph;
/** Faucet node ids fed by the named valve — the direct downstream of a crossing. */
export declare function downstreamFaucets(graph: ValveGraph, valveName: string): readonly string[];
/** Gate valve names whose enrichment context depends on the named valve. */
export declare function contextDependents(graph: ValveGraph, valveName: string): readonly string[];
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