export type ValueOrNull<T> = T | null;
export type EventHandler<T = Event> = (event: T) => void;
export type ClientCoordinate = {
    clientX: number;
    clientY: number;
};
export type PickerDefScrollShape = 'scale' | 'flat' | 'rotate';
export type PointEventType = PointerEvent | MouseEvent | TouchEvent;
export interface MomentumConfig {
    time: number;
    distance: number;
    duration: number;
    deceleration: number;
}
export interface ClickToSelectConfig {
    duration: number;
}
export interface InnerClickToSelectConfig extends ClickToSelectConfig {
    enable: boolean;
}
export interface MouseWheelConfig {
    speed: number;
    discreteTime: number;
}
export interface InnerMouseWheelConfig extends MouseWheelConfig {
    enable: boolean;
}
export type ShapeFunc = (y: number, itemHeight: number, items?: HTMLCollection) => void;
export interface PickerBaseOptions {
    usePointerEvents: boolean;
    scrollShape: PickerDefScrollShape | ShapeFunc;
    moveThreshold: number;
    momentum: MomentumConfig | false;
    itemClassName: string;
    clickToSelect: boolean | ClickToSelectConfig;
    mouseWheel: boolean | MouseWheelConfig;
    onlyLeftButton: boolean;
}
export type ChangeTrigger = 'click' | 'drag' | 'init' | 'api' | 'wheel' | '';
export interface PickerViewOptions extends PickerBaseOptions {
    selectedIndex: number;
    onChange(event: number, trigger: ChangeTrigger): void;
}
export interface PickerOptions extends PickerBaseOptions {
    selectedIndexes: number[];
    onChange?(event: number[], trigger: ChangeTrigger, colIndex: number): void;
}