/**
 * Type guard that returns the value if it's a non-empty string, otherwise returns undefined.
 * This is useful for ensuring type safety when working with props that should be strings.
 *
 * @example
 * // Returns 'hello'
 * onlyString('hello');
 *
 * // Returns undefined
 * onlyString(42);
 * onlyString('');
 * onlyString(null);
 * onlyString(undefined);
 */
export declare function onlyString<P extends string | unknown>(prop: P): (P & string) | undefined;
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