/** One `step` edge of the flow graph, both endpoints as `path:symbol` node ids. */
export interface StepEdge {
    readonly from: string;
    readonly to: string;
}
export interface StructuralMax {
    /** Longest chain of `step` edges through the graph, counted in nodes. */
    readonly value: number;
    /** Every `step`-edge cycle found — each a ring of `path:symbol` node ids. */
    readonly cycles: readonly (readonly string[])[];
}
/** Longest `step`-edge chain across the flow graph, plus any `step`-edge cycles. */
export declare function computeStructuralMax(nodeIds: readonly string[], edges: readonly StepEdge[]): StructuralMax;
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