/**
 * Extracts a URL from various target types.
 * @param {string|Request|URL} target - The target to extract the URL from. It can be a string, a Fetch Request object, or a URL object.
 * @returns {string|undefined} The extracted URL as a string, or undefined if the target type is not supported.
 */
export function extractUrl(target: string | Request | URL): string | undefined;
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