import type { Type } from '../../type/index.js';
/**
 * Options for the @Index decorator.
 */
export interface IndexDecoratorOptions {
    /** Custom index name */
    name?: string;
    /** Whether index is unique */
    unique?: boolean;
    /** Index type (btree, hash, gin, gist) */
    type?: 'btree' | 'hash' | 'gin' | 'gist';
    /** Partial index WHERE clause */
    where?: string;
}
/**
 * Define a composite index on an entity class.
 *
 * @example
 * ```ts
 * @Index(['lastName', 'firstName'], { name: 'idx_users_fullname' })
 * @Entity()
 * export class User {
 *   @Id() id?: number;
 *   @Field() firstName?: string;
 *   @Field() lastName?: string;
 * }
 *
 * // With unique and partial index
 * @Index(['email'], { unique: true })
 * @Index(['status'], { where: "status = 'active'" })
 * @Entity()
 * export class User { ... }
 * ```
 */
export declare function Index<E>(columns: string[], options?: IndexDecoratorOptions): (target: Type<E>) => void;
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