export declare class FieldsProjection {
    [key: string]: FieldsProjection.Item;
}
export declare namespace FieldsProjection {
    class Item {
        sign?: string;
        projection?: FieldsProjection;
    }
}
export declare function parseFieldsProjection(projection: string | string[], keepCase?: boolean): FieldsProjection | undefined;
export declare function parse(input: string, target: FieldsProjection): void;