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import type { HexString } from '../types.ts';
import { hexHasPrefix } from './hasPrefix.ts';
/** * @name hexAddPrefix * @summary Adds the `0x` prefix to string values. * @description * Returns a `0x` prefixed string from the input value. If the input is already prefixed, it is returned unchanged. * @example * <BR> * * ```javascript * import { hexAddPrefix } from 'https://deno.land/x/polkadot@0.2.40/util/mod.ts'; * * console.log('With prefix', hexAddPrefix('0a0b12')); // => 0x0a0b12 * ``` */export function hexAddPrefix (value?: string | null): HexString {  return value && hexHasPrefix(value)    ? value    : `0x${value && value.length % 2 === 1 ? '0' : ''}${value || ''}`;}