/**
 * Constraint Handlers Module
 * Handles constraint operation handlers (create, drop, update)
 */
import type { ILegacySyncOptions, TNullable } from '../types';
import type { Client } from 'pg';
interface IConstraintRow {
    table_name: string;
    constraint_name: string;
    constraint_type: string;
    column_name: TNullable<string>;
    foreign_table_name: TNullable<string>;
    foreign_column_name: TNullable<string>;
    update_rule: TNullable<string>;
    delete_rule: TNullable<string>;
    check_clause?: TNullable<string>;
}
export declare class ConstraintHandlers {
    private options;
    private constraintDefinitions;
    constructor(sourceClient: Client, targetClient: Client, options: ILegacySyncOptions);
    /**
     * Handle constraints that have changed
     */
    handleConstraintsToUpdate(sourceConstraints: IConstraintRow[], targetConstraints: IConstraintRow[], alterStatements: string[]): Promise<void>;
    /**
     * Handle constraints to drop in target
     */
    /**
     * Drop FKs on tables that remain in the schema but reference a removed module table
     * (must run before CASCADE drops on the referenced tables).
     */
    private emitForeignKeyDropsReferencingRemovedTables;
    handleConstraintsToDrop(sourceConstraints: IConstraintRow[], targetConstraints: IConstraintRow[], alterStatements: string[]): Promise<void>;
    /**
     * Handle constraints to create in target
     */
    handleConstraintsToCreate(sourceConstraints: IConstraintRow[], targetConstraints: IConstraintRow[], alterStatements: string[]): Promise<void>;
}
export {};
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