/**
 * Helper function to abbreviate a number
 *
 * @param input - The number to be abbreviated.
 * @param decimalPlace - The decimals users define for final abbreviated number. Default to 1.
 * @returns The abbreviated number
 *
 * @example
 * abbreviateNumber(1234, '1')              // Returns: '1.2K'
 */
export declare function abbreviateNumber(input: number | null, decimalPlace?: number): string;