/** Generic array of two values [T, T] */
export declare type Tuplet<T> = [T, T];
/** Generic array of three values [T, T, T] */
export declare type Triplet<T> = [T, T, T];
/** Domain of a scale. Represented as a number array on the form [from, to] */
export declare type Domain = Tuplet<number> | number[];
/** Range to scale a domain value to. Represented as a number array on the form [from, to] */
export declare type Range = Tuplet<number> | number[];
/** Interface to abstract d3 selection */
export declare type D3Selection = any;
/**
 * The scale interface supports a subset of the scale in d3js.
 * It is defined to support using scaling functions that interpolates or
 * otherwise changes the input values (decorator pattern).
 */
export interface Scale {
    /** scale value from domain to range */
    (v: number): number;
    /** get scale's current domain */
    domain(): Domain;
    /** set scale's current domain */
    domain(newDomain?: Domain): Scale;
    /** get scale's current range */
    range(): Range;
    /** set scale's current range */
    range(newRange?: Range): Scale;
    /** inverse scale range value to domain value */
    invert(v: number): number;
    /** get a list of ticks based on scale domain and range, and optionally desired number of ticks */
    ticks(nTicks?: number): number[];
    /** clone scale */
    copy(): Scale;
    /** Allow any other properties */
    [propName: string]: any;
}