export declare function isDefined<T>(value: T | undefined | null): value is T;
export declare function ensureValue<T>(value: T | undefined | null, message: string): T;
export declare function mathMax(firstValue: number, secondValue: null | number): number;
export declare function mathMaxNullable(left: number | null | undefined, right: number | null | undefined): number | null;
export declare function nullableArrayUnion<T>(left: T[] | null | undefined, right: T[] | null | undefined): T[] | null;
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