export declare function isDefined<T>(x: T | null | undefined): x is T;
export declare function isNotDefined<T>(x: T | null | undefined): x is null | undefined;
export type ObjectWithLength = {
    length: number;
};
export declare function isEmpty<T extends ObjectWithLength>(x: T): boolean;
export declare function isNotEmpty<T extends ObjectWithLength>(x: T): boolean;
export declare function isDefinedAndNotEmpty<T extends ObjectWithLength>(x: T | null | undefined): x is T;
export declare function isNotDefinedOrEmpty<T extends ObjectWithLength>(x: T | null | undefined): x is null | undefined;
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