/** Tick step rounded to 1/2/5×10^n (d3-like algorithm). */
export declare function tickStep(start: number, stop: number, count: number): number;
export declare function ticks(start: number, stop: number, count?: number): number[];
/** Extends the domain to "nice" bounds that are multiples of the tick step. */
export declare function niceExtent(start: number, stop: number, count?: number): [number, number];
export declare function extent(values: number[]): [number, number] | undefined;