/**
 * Coalition
 *
 * Represents a governing coalition of multiple political parties
 *
 * Research Foundation:
 * - Laver (2020): Minimal winning coalitions in parliamentary systems
 * - Martin & Stevenson (2001): Government formation in parliamentary democracies
 *
 * @module coalition/Coalition
 */
import { PoliticalParty } from '../core/PoliticalParty.js';
import { PolicyVector } from '../policy/PolicyVector.js';
/**
 * Coalition configuration
 */
export interface CoalitionConfig {
    /** Member parties */
    parties: PoliticalParty[];
    /** Formation date (month in simulation) */
    formationDate: number;
    /** Is this coalition currently in government? */
    isGoverning?: boolean;
}
/**
 * Coalition
 *
 * Represents a political coalition with member parties and stability metrics
 */
export declare class Coalition {
    readonly parties: PoliticalParty[];
    readonly formationDate: number;
    isGoverning: boolean;
    /** Cached values for performance */
    private _totalSeats;
    private _policyCentroid;
    constructor(config: CoalitionConfig);
    /**
     * Get total seat share of coalition (0-1)
     */
    getTotalSeats(): number;
    /**
     * Get policy centroid of coalition (weighted by seat share)
     *
     * This represents the coalition's effective policy position,
     * weighted by each party's influence (seat share)
     */
    getPolicyCentroid(): PolicyVector;
    /**
     * Check if coalition has majority (>50% seats)
     */
    hasMajority(): boolean;
    /**
     * Check if coalition is minimal winning
     * (removing any party would lose majority)
     *
     * Research: Minimal winning coalitions are most common (Laver 2020)
     */
    isMinimalWinning(): boolean;
    /**
     * Get excess seats beyond majority threshold
     * Higher values = more stable (buffer against defections)
     */
    getExcessSeats(): number;
    /**
     * Get number of parties in coalition
     */
    getSize(): number;
    /**
     * Check if coalition contains specific party
     */
    hasParty(partyId: string): boolean;
    /**
     * Get party IDs in coalition
     */
    getPartyIds(): string[];
    /**
     * Check if all parties are compatible with each other
     * (no blacklisted combinations)
     */
    areAllPartiesCompatible(): boolean;
    /**
     * String representation
     */
    toString(): string;
    /**
     * Clone coalition
     */
    clone(): Coalition;
}