import { type ReadonlyCounter } from "@gouvernathor/python/collections";
import { type Simple } from "../tally";
export interface DisproportionMetric<Party> {
    (p0: {
        votes: Simple<Party>;
        seats: ReadonlyCounter<Party, number>;
    }): number;
}
/**
 * Returns the mean value (across all candidates) of the absolute difference
 * between the theoretical, (f)ra(c)tional number of seats and the allocated number of seats.
 * The bigger, the less proportional.
 *
 * Compared to a sum or mean of absolute differences of percentage,
 * this
 */
export declare function defaultMetric<Party>({ votes, seats }: {
    votes: Simple<Party>;
    seats: ReadonlyCounter<Party, number>;
}): number;