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import type Chart from '../core/core.controller.js';
import type { ChartEvent } from '../types.js';
/**
* Note: typedefs are auto-exported, so use a made-up `dom` namespace where
* necessary to avoid duplicates with `export * from './helpers`; see
* https://github.com/microsoft/TypeScript/issues/46011
* @typedef { import('../core/core.controller.js').default } dom.Chart
* @typedef { import('../../types').ChartEvent } ChartEvent
*/
/**
* @private
*/
export declare function _isDomSupported(): boolean;
/**
* @private
*/
export declare function _getParentNode(domNode: HTMLCanvasElement): HTMLCanvasElement;
export declare function getStyle(el: HTMLElement, property: string): string;
/**
* Gets an event's x, y coordinates, relative to the chart area
* @param event
* @param chart
* @returns x and y coordinates of the event
*/
export declare function getRelativePosition(event: Event | ChartEvent | TouchEvent | MouseEvent, chart: Chart): {
x: number;
y: number;
};
export declare function getMaximumSize(canvas: HTMLCanvasElement, bbWidth?: number, bbHeight?: number, aspectRatio?: number): {
width: number;
height: number;
};
/**
* @param chart
* @param forceRatio
* @param forceStyle
* @returns True if the canvas context size or transformation has changed.
*/
export declare function retinaScale(chart: Chart, forceRatio: number, forceStyle?: boolean): boolean | void;
/**
* Detects support for options object argument in addEventListener.
* https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Safely_detecting_option_support
* @private
*/
export declare const supportsEventListenerOptions: boolean;
/**
* The "used" size is the final value of a dimension property after all calculations have
* been performed. This method uses the computed style of `element` but returns undefined
* if the computed style is not expressed in pixels. That can happen in some cases where
* `element` has a size relative to its parent and this last one is not yet displayed,
* for example because of `display: none` on a parent node.
* @see https://developer.mozilla.org/en-US/docs/Web/CSS/used_value
* @returns Size in pixels or undefined if unknown.
*/
export declare function readUsedSize(element: HTMLElement, property: 'width' | 'height'): number | undefined;