import type { BondOrder, BondPair, Site, StructureBond } from './';
export type PerceptionOptions = {
    total_charge?: number;
    max_atoms?: number;
};
export type PerceivedBond = BondPair & {
    bond_order: BondOrder;
    perceived: boolean;
    aromatic_ring?: number;
    kekule_order?: BondOrder;
};
export declare function perceive_bond_orders(sites: Site[], bonds: BondPair[], opts?: PerceptionOptions): PerceivedBond[];
export declare function compose_perceived_bonds(perceived: PerceivedBond[], explicit_bonds: StructureBond[], aromatic_display: `aromatic` | `kekule`): PerceivedBond[];