/** A static class that provides pure functions */
/**
 * Used to explicitly reset something to default value
 * if there's ambiguity between previous value and default value
 */
export declare const DEFAULT: unique symbol;
export default class Util {
    static DEBUG: boolean;
    /**
     * Converts 2-D coordinates to their corresponding index in a 1-D array representation
     * @param x - The x coordinate
     * @param y - The y coordinate
     * @param gridHeight - The width of the 2-D representation (the grid height)
     * @returns The corresponding index
     */
    static coordToIndex(x: number, y: number, gridHeight: number): number;
    /**
     * Converts a 1-D array index into an (x, y) coordinate in its corresponding 2-D representation
     * @param index - the 1D array index
     * @param gridHeight - The width of the 2-D representation (the grid height)
     * @returns - The corresponding x and y coordinates
     */
    static indexToCoord(index: number, gridHeight: number): [x: number, y: number];
    /**
     * Draws a rounded rectangle
     * Adapted from https://stackoverflow.com/a/3368118/2234742
     * @param ctx - The canvas context to draw on
     * @param x - The x coordinate at which to draw the rounded rectangle
     * @param y - The y coordinate at which to draw the rounded rectangle
     * @param width - The width of the rounded rectangle to draw
     * @param height  - The height of the rounded rectangle to draw
     * @param radius - The border radius of the rounded rectangle
     * @param fill - Whether the rectangle should be filled
     * @param stroke - Whether the rectangle should be stroked
     */
    static drawRoundedRectangle(ctx: CanvasRenderingContext2D, x: number, y: number, width: number, height: number, radius?: number, fill?: boolean, stroke?: boolean): void;
    private static devicePixelRatio;
    /**
     * Gets the current devicePixelRatio in a performant way
     * @returns The device pixel ratio
     */
    static getDevicePixelRatio(): number;
}