/** Run now */
export declare function run<U>(f: () => U): U;
/** Do nothing
 *
 * ```ts
 * let a: undefined = call()
 * ```
*/
export declare function call(): void;
/** Run now
 *
 * ```ts
 * let b: 0 = call(() => 0)
 * ```
*/
export declare function call<U>(f: () => U): U;
/** Call function
 *
 * ```ts
 * let a: undefined = call()
 * let b: 0 = call(() => 0)
 * let c: 1 = call(1, v => v)
 * let d: 3 = call(1, 2, (a, b) => a + b)
 * ```
*/
export declare function call<A extends any[], U>(...args: [...args: A, f: (...args: A) => U]): U;
/** Use a value and make a mapping */
export declare function used<T, U>(v: T, f: (v: T) => U): U;
/** Use value and do something extra */
export declare function also<T>(v: T, f: (v: T) => void): T;
/** Do nothing
 *
 * ```ts
 * let a: undefined = collect()
 * ```
*/
export declare function collect(): void;
/** Collect Iterable or Generator
 *
 * ```ts
 * let b: 1 = collect(function* () { yield 1 })
 * ```
*/
export declare function collect<T>(f: () => Iterable<T>): T[];
/** Call function
 *
 * ```ts
 * let a: undefined = collect()
 * let b: 1 = collect(function* () { yield 1 })
 * let c: [1, 2, 3] = collect(1, 2, 3, function* (a, b, c) { yield* [a, b, c] })
 * ```
*/
export declare function collect<A extends any[], T>(...args: [...args: A, f: (...args: A) => Iterable<T>]): T[];