/** Checks whether the nums sequence is a subsequence of integers, i.e. n, n+1, n+2, ...  */
export declare function isSequential(nums: number[]): boolean;
/** Checks whether the nums sequence is sorted. */
export declare function isSorted(nums: number[]): boolean;
/**
 * Converts an object to a human-readable representation.
 * @param obj The target object.
 * @param props A sequence of object properties to include in the output.
 * @returns A human-readable string for the given object.
 */
export declare function objToStr(obj: any, props: string[]): string;
/**
 * Converts a Map instance into an object with corresponding keys and values
 * or null if the map has no entries.
 */
export declare function serializeMap(map: Map<string, unknown>): Record<string, unknown> | null;