import { DbHelperModel } from '../models/db-helper-model.model';
import { ColumnConfig } from './configurator/column.configurator';
/**
 * @public
 * @function ForeignModel
 *
 * @description
 * Annotation factory to declare foreign model.
 *
 * @example
 * ```typescript
 *  @Table()
 *  export class Todo extends DbHelperModel {
 *
 *      @PrimaryKey({autoIncremented: true})
 *      public id: number
 *
 *      @Column()
 *      public name: string;
 *
 *      @Column({type: 'long'})
 *      public dueDate: number;
 *
 *      @ForeignModel(Category, {name: 'categoryFk'})
 *      public category: Category
 *  }
 * ```
 *
 *  @template T @extends DbHelperModel the target model
 *
 * @param {{new(): DbHelperModel}} model    the target model
 * @param {ColumnConfig?} config            optional configuration
 * @param {string?} relationKey             optional relation key
 *
 * @return {Function} the annotation
 *
 * @author  Olivier Margarit
 * @since   0.1
 */
export declare function ForeignModel<T extends DbHelperModel>(model: {
    new (): DbHelperModel;
}, config?: ColumnConfig, relationKey?: string): any;