export declare function nullToUndefined<T>(value: T | null): T | undefined;
export declare function map<T, U>(array: readonly [T, T, ...T[]], fn: (x: T) => U): [U, U, ...U[]];
export declare function map<T, U>(array: readonly [T, ...T[]], fn: (x: T) => U): [U, ...U[]];
export declare function map<T, U>(array: readonly T[], fn: (x: T) => U): U[];
export declare function mapValues<T extends object, R extends {
    [K in keyof T]: any;
}>(obj: T, callback: <K extends keyof T>(value: T[K], key: K) => R[K]): R;
export declare function mapValues<T extends object, R extends Record<string, Map<any, any>>>(obj: T, callback: <K extends keyof T>(value: T[K], key: K) => R[string]): R;
export declare function isNotNil<T>(value: T | null | undefined): value is T;
export declare function isNotEmpty<T>(array: readonly T[]): array is [T, ...T[]];
export declare function isTwoOrMoreElements<T>(array: readonly T[]): array is [T, T, ...T[]];
export declare function hasAllKeys<K, V>(map: Map<K, V>, keys: readonly K[]): boolean;
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