export declare type Maybe<T> = T | null | undefined;
export declare function isPresent<T>(maybe: Maybe<T>): maybe is T;
export declare function ifPresent<T>(maybe: Maybe<T>, then: (v: T) => void): void;
export declare function ifPresent<T, R = void>(maybe: Maybe<T>, then: (v: T) => R, otherwise: () => R): R;
export declare function ensure<T>(maybe: Maybe<T>, fallback: T): T;
export declare function throwIfAbsent<T>(maybe: Maybe<T>, error?: Error): T | never;
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