/**
 * @name stringUpperFirst
 * @summary Lowercase the first letter of a string
 * @description
 * Lowercase the first letter of a string
 * @example
 * <BR>
 *
 * ```javascript
 * import { stringUpperFirst } from '@polkadot/util';
 *
 * stringUpperFirst('abc'); // => 'Abc'
 * ```
 */
export default function stringUpperFirst(value?: string | null): string;
