/**
 * Get's the Value of a specific Url-Parameter.
 * @param {string} parameterName The Name of the searched Parameter.
 * @param {string} url The Url which the Parameter-Value is read from (if not set the current Url is used).
 * @returns {string|null} If the Parameter exists on the Url the Value is returned as a string.
 * @since 1.0.0
 */
export default function getUrlParameter(parameterName: string, url?: string): string | null;
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