export declare const firstYear: (yearList: number[]) => number;
export declare const lastYear: (yearList: number[]) => number;
export declare const keyLeftMove: (yearList: number[]) => ((previous: number) => number);
export declare const keyRightMove: (yearList: number[]) => ((previous: number) => number);
export declare const keyUpMove: (yearList: number[]) => ((previous: number) => number);
export declare const keyDownMove: (yearList: number[]) => ((previous: number) => number);
export declare const keyTabMove: (previous: number) => number;