/**
 * Convert string type to UPPERCASE.
 * @example
 * ```ts
 * type UppercaseString = UpperCase<"hello world">; // "HELLO WORLD"
 * ```
 */
export type UpperCase<T extends string> = Uppercase<T>;
/**
 * Convert a string to UPPERCASE.
 * @example
 * ```ts
 * const uppercaseString = toUpperCase("hello world"); // "HELLO WORLD"
 * ```
 */
export declare function toUpperCase<T extends string>(string: T): UpperCase<T>;
export type UpperCaseAll<T extends string[]> = T extends [infer First, ...infer Rest] ? First extends string ? Rest extends string[] ? [UpperCase<First>, ...UpperCaseAll<Rest>] : never : never : [];
export declare function toUpperCaseAll<T extends string[]>(strings: T): UpperCase<T[number]>[];
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