type Invalid<T> = Error & {
    __errorMessage: T;
};
export declare function isDefined<T>(value: T | undefined | null): value is T;
type AsUniqueArray<A extends readonly any[], B extends readonly any[]> = {
    [I in keyof A]: unknown extends {
        [J in keyof B]: J extends I ? never : B[J] extends A[I] ? unknown : never;
    }[number] ? Invalid<[A[I], "is repeated"]> : A[I];
};
export declare const asUniqueArray: <N extends string, A extends [] | (readonly N[] & AsUniqueArray<A, A>)>(a: A) => A;
export {};