/**
 * Determines whether a given value is null@
 */
export declare function isNull(value: any): value is null;
/**
 * Determines whether a given value is undefined
 */
export declare function isUndefined(value: any): value is undefined;
/**
 * Determines whether a given value is null or undefined
 */
export declare function isNullish(value: any): value is null | undefined;
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