packages/util/src/bn/toBn.ts
// Copyright 2017-2024 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { ToBigInt, ToBn } from '../types.js';
import { hexToBn } from '../hex/toBn.js';
import { isBigInt } from '../is/bigInt.js';
import { isHex } from '../is/hex.js';
import { isToBigInt } from '../is/toBigInt.js';
import { isToBn } from '../is/toBn.js';
import { BN } from './bn.js';
/**
* @name bnToBn
* @summary Creates a BN value from a BN, bigint, string (base 10 or hex) or number input.
* @description
* `null` inputs returns a `0x0` result, BN values returns the value, numbers returns a BN representation.
* @example
* <BR>
*
* ```javascript
* import BN from 'bn.js';
* import { bnToBn } from '@polkadot/util';
*
* bnToBn(0x1234); // => BN(0x1234)
* bnToBn(new BN(0x1234)); // => BN(0x1234)
* ```
*/
export function bnToBn <ExtToBn extends ToBigInt | ToBn> (value?: ExtToBn | BN | bigint | string | number | null): BN {
return value
? BN.isBN(value)
? value
: isHex(value)
? hexToBn(value.toString())
: isBigInt(value)
? new BN(value.toString())
: isToBn(value)
? value.toBn()
: isToBigInt(value)
? new BN(value.toBigInt().toString())
: new BN(value)
: new BN(0);
}