/**
 * Extension operations — database-wide CREATE EXTENSION drift (not per-function).
 */
import type { ILegacySyncOptions } from '../../types';
import { type SyncDbSide } from '../syncClient';
import type { Client } from 'pg';
interface IExtensionRow {
    extname: string;
}
export declare class ExtensionOperations {
    private sourceClient;
    private targetClient;
    private options;
    constructor(sourceClient: Client, targetClient: Client, options: ILegacySyncOptions);
    getExtensions(side: SyncDbSide): Promise<IExtensionRow[]>;
    /**
     * Emit CREATE EXTENSION for names present after state apply (source) but missing on target.
     * Never DROP extensions or their member functions — use state + prune for removal.
     */
    generateExtensionOperations(): Promise<string[]>;
}
export {};
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