export declare type Nullary<T> = () => T;
export declare type Value<T> = T | Nullary<T>;
export declare function isNullary<F extends Function>(f: F): boolean;
export declare function constant<T>(value: T): Nullary<T>;
export declare function empty(): Nullary<void>;
export declare function valueOf<T>(value: Value<T>): T;
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