utils.fromWei & toWei returns string when I pass BigNumber

[szerintedmi]

When I pass MikeMcl BigNumber the return value is string. It used to recognise BigNumbers from that library pre 1.0.0

import BigNumber from "bignumber.js";
let ethStringToWei = web3.utils.toWei("1");
    let ethBNToWei = web3.utils.toWei(new BigNumber("1"));
    console.log(
        web3.version,
        typeof ethStringToWei,
        ethStringToWei,
        typeof ethBNToWei,
        ethBNToWei
    );

// output:
// 1.0.0-beta.18 string 1000000000000000000 string 1000000000000000000

[frozeman]

Yes we don't return Bignumber anymore, you can choose your own BN lib you want to use and convert the number string yourself.
Internally we use BN.js

[linusnorton]

@frozeman is there a migration document somewhere? I only found this out by trial and error.