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import type { ToBnOptions } from '../types.ts';
import { BN } from '../bn/bn.ts';import { hexStripPrefix } from './stripPrefix.ts';
/** * @name hexToBn * @summary Creates a BN.js object from a hex string. * @description * `null` inputs returns a `BN(0)` result. Hex input values return the actual value converted to a BN. Anything that is not a hex string (including the `0x` prefix) throws an error. * @param _value The value to convert * @param _options Options to pass while converting * @param _options.isLe Convert using Little Endian * @param _options.isNegative Convert using two's complement * @example * <BR> * * ```javascript * import { hexToBn } from 'https://deno.land/x/polkadot@0.2.33/util/mod.ts'; * * hexToBn('0x123480001f'); // => BN(0x123480001f) * ``` */export function hexToBn (value?: string | null, { isLe = false, isNegative = false }: ToBnOptions = {}): BN {  if (!value || value === '0x') {    return new BN(0);  }
  const stripped = hexStripPrefix(value);  const bn = new BN(stripped, 16, isLe ? 'le' : 'be');
  // fromTwos takes as parameter the number of bits, which is the hex length  // multiplied by 4 (2 bytes being 8 bits)  return isNegative    ? bn.fromTwos(stripped.length * 4)    : bn;}