declare function calcTickDirection(isInnerAxis: boolean, isAngularAxisFlipped: boolean, startAngle: number, totalAngle: number): {
    direction: 1 | -1;
    tickRotation: number;
    startAngle: number;
};
declare function calcLabelPosition(isInnerAxis: boolean, isAngularAxisFlipped: boolean, startAngle: number, totalAngle: number): {
    isAntiClockWise: boolean;
    labelRotation: number;
    startAngle: number;
};
declare function checkPolarLabelsOverlap(tickCoords: number[], minAngleToSkipLastLabelRadian?: number): boolean;
export declare const polarChartHelper: {
    calcTickDirection: typeof calcTickDirection;
    calcLabelPosition: typeof calcLabelPosition;
    checkPolarLabelsOverlap: typeof checkPolarLabelsOverlap;
};
export {};