/**
 * @name px
 * @description Converts the specified number to a pixel string
 * @param arg <string | number> The number to convert
 * @returns <string> The pixel string
 * @example
 * const pxString = px(10);
 * console.info(pxString); // 10px
 * const pxString = px('10'); // 10px
 *
 * @author Pol Gubau Amores - https://polgubau.com
 */
export declare function px(arg: string | number): string;
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