/**
 * Because since node 4.0.0 the internal util.is* functions got deprecated
 * @param val Any value to test if null or undefined
 */
export declare function isNullOrUndefined(val: unknown): val is null | undefined;
/**
 * Check whether a PID is alive
 * @param pid PID
 */
export declare function isAlive(pid?: number): boolean;
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