export declare const isDefined: <T>(value: T | undefined | void) => value is T;
export declare const isUnique: <T>(value: T, index: number, array: T[]) => boolean;
export declare const isNotUnique: <T>(value: T, index: number, array: T[]) => boolean;
export declare const isPropsDefined: <T, K extends keyof T>(...props: K[]) => (obj: T) => obj is T & Record<K, NonNullable<T[K]>>;
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