import { IndexDefinition } from '../definition';
import { CouchbaseIndex, IndexManager, WithClause } from '../index-manager';
import { IndexMutation } from './index-mutation';
import { Logger } from '../options';
/**
 * Represents an index mutation which updates an existing index
 */
export declare class UpdateIndexMutation extends IndexMutation {
    private existingIndex;
    private withClause;
    constructor(definition: IndexDefinition, name: string, withClause: WithClause, existingIndex: CouchbaseIndex);
    print(logger: Logger): void;
    /** @inheritDoc */
    execute(manager: IndexManager, logger: Logger): Promise<void>;
    /**
     * Formats a list of keys for human readable output
     */
    private formatKeys;
    isSafe(): boolean;
}