text: // @flow
  export type TickScale = {
    (d: number): number,
    ticks(count: number): Array<number>,
    tickFormat(count: number, fmt: ?string): (val: number) => string,
  };
  
  export type RadarVariable = {key: string, label: string};
  
  type RadarDataSet = {
    key: string,
    label: string,
    values: {[variableKey: string]: number},
  };
  
  export type RadarData = {
    variables: Array<RadarVariable>,
    sets: Array<RadarDataSet>,
  };
  
  export type RadarPoint = {
    x: number,
    y: number,
    value: number,
    setKey: string,
    variableKey: string,
    key: string,
  };
  