import React from 'react';
/**
 * ---
 * category: utilities/utils
 * ---
 * Converts a unit value size combination (em, rem, px) to a number representing px
 *
 * Example inputs:
 *  - '100rem'
 *  - '20em'
 *  - '40px'
 *
 * @module px
 *
 * @param {String|number} val The value to look up. If it's a number its just returned as is.
 * @param {Document|Window|Node|React.ReactElement |React.Component|null} el - containing element, for context measure is em (defaults to `document.body`)
 * @returns {Number} Returns numerical representation of pixels
 */
declare function px(val: string | number, el?: Document | Window | Node | React.ReactElement | React.Component | null): number;
export default px;
export { px };
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