/**
 * Checks if the given string is an address
 *
 * @param {string} address
 * @param {string} coin
 * @returns {boolean}
 */
function isValid(address: string, coin: string): boolean;

/**
 * Use regex to pre-check the address is a legal address type.
 *
 * @param {string} address
 * @param {string} coin
 * @returns {boolean}
 */
function preCheck(address: string, coin: string): boolean;

/**
 * Get the checker
 *
 * @param {string} coin
 * @returns {IChecker}
 */
function cryptoChecker(coin: string): IChecker;

interface IChecker {
  isValid(address: string): boolean;
  preCheck(address: string): boolean;
}

import { isValid } from 'cryptocurrency-address-checker';

const valid: boolean = isValid('1KFzzGtDdnq5hrwxXGjwVnKzRbvf8WVxck', 'BTC');
if (valid) {
  console.log('This is a valid address');
} else {
  console.log('Address INVALID');
}