export declare class FieldHandler {
    /**
     * Internap fields
     *
     * @type {string[]}
     * @memberof Fieldandler
     */
    fields: string[];
    constructor(withAllProperty?: boolean);
    /**
     * Symbol that separates fields
     *
     * @private
     * @static
     * @memberof Fieldandler
     */
    private static readonly fieldSeparator;
    /**
     * Symbol that mean append
     *
     * @private
     * @static
     * @memberof Fieldandler
     */
    private static readonly fieldAppendSymbol;
    /**
     * Symbol that means all field
     *
     * @private
     * @static
     * @memberof Fieldandler
     */
    private static readonly allFieldsSymbol;
    /**
     * Add's a simple field. * if empty
     *
     *
     * @param {(string | string[])} [fields]
     * @memberof Fieldandler
     */
    add(fields?: string | string[]): void;
    /**
     * Add's relation.
     *
     * @param {string} relation
     * @param {(string | string[])} [fields=Fieldandler.allFieldsSymbol]
     * @memberof Fieldandler
     */
    addRelation(relation: string, fields?: string | string[]): void;
    /**
     * Add's relation with * on the end.
     *
     * @param {(string | string[])} [relations=Fieldandler.allFieldsSymbol]
     * @memberof Fieldandler
     */
    addFullRelation(relations?: string | string[]): this;
    /**
     * Public getter.
     *
     * @returns
     * @memberof Fieldandler
     */
    toString(): string;
}