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import type { HexString } from '../types.ts';
import { isHex } from '../is/hex.ts';
/** * @name hexHasPrefix * @summary Tests for the existence of a `0x` prefix. * @description * Checks for a valid hex input value and if the start matched `0x` * @example * <BR> * * ```javascript * import { hexHasPrefix } from 'https://deno.land/x/polkadot@0.2.33/util/mod.ts'; * * console.log('has prefix', hexHasPrefix('0x1234')); // => true * ``` */export function hexHasPrefix (value?: string | null): value is HexString {  return !!value && isHex(value, -1);}