/**
 * Extract dynamic `:param` values from a pathname against a route pattern.
 *
 * Returns a params object when the pattern matches, or `null` when it does not.
 * Param values are URL-decoded segment strings.
 *
 * @example
 * extractRouteParams("/users/:id", "/users/42")
 * // → { id: "42" }
 *
 * extractRouteParams("/users/:id", "/posts/42")
 * // → null
 */
export declare function extractRouteParams(pattern: string, pathname: string): Record<string, string> | null;
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