import { IRelationDescriptor } from './interfaces.js';
import { ModelBase } from './model.js';
import { OneToManyRelationList } from './relation-objects.js';
/**
 * Relation object for user metadata
 * Base class for all metadata related models.
 *
 * Metadata is used to store additional information about particular model, that we dont know at design time.
 */
export declare abstract class MetadataModel<T> extends ModelBase<MetadataModel<T>> {
    protected _value: any;
    protected _key: string;
    Id: number;
    Type: 'number' | 'float' | 'string' | 'json' | 'boolean' | 'datetime';
    get Value(): any;
    set Value(value: any);
    get Key(): string;
    set Key(value: string);
    protected getType(val: any): 'number' | 'float' | 'string' | 'json' | 'boolean' | 'datetime';
}
/**
 *
 * Base class for all metadata related relations.
 * It allows to access metadata as relation object properties. use it for example like this:
 *
 * ```typescript
 * const user = await User.find(1);
 * user.Metadata['test:test'] = 'test';
 * await user.Metadata.sync();
 * ```
 */
export declare class MetadataRelation<R extends MetadataModel<R>, O extends ModelBase<O>> extends OneToManyRelationList<R, O> {
    [key: string]: any;
    /**
     *
     * Delete metadata by key in DB
     *
     * @param key key of the metadata to get
     * @returns
     */
    delete(key: string): Promise<void>;
    constructor(owner: O, relation: IRelationDescriptor, objects?: R[]);
}
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