import type { ErrorType } from '../errors/utils.js'
import type { Hex } from '../types/data.js'

export type IsHexOptions = {
  strict?: boolean | undefined
}

export type IsHexErrorType = ErrorType

export function isHex(
  value: unknown,
  options: IsHexOptions = {},
): value is Hex {
  const { strict = true } = options
  if (!value) return false
  if (typeof value !== 'string') return false
  return strict ? /^0x[0-9a-fA-F]*$/.test(value) : value.startsWith('0x')
}