how to represent decimals in V6

[Bot80926]

Ethers Version

6.2.3

Search Terms

No response

Describe the Problem

I was run a front-run bot with ethers V5, i set maxPriorityFeePerGas for 1.2times, here is the code in v5, everything is ok
tx.maxPriorityFeePerGas * 1.2

But when i update to v6, there is no longer a BigNumber class. how can i adapt the code to the latest version ?
I tried tx.maxPriorityFeePerGas * 1.2n, obviously, the wording of 1.2n is wrong, so how can I express that the gas fee will be increased by 1.2 times?

[Bot80926]

In other words, how do I mean 1.2 in the new version

import { ethers } from "ethers";

const a = ethers.toBigInt(1);

const b = a + 1.2n;

// expect output: 2.2n, but 1.2 is not an integer

[zemse]

ethers.BigNumber or bigint cannot have decimals, they can only be integers. ethers.BigNumber.from(1.2) this must have given you an underflow error.

In order to work with decimals, you have to choose how many decimals you would like. E.g. you want 2 decimals, then you can work with numbers multipled by 100.

// nah
const a = 1n;
const b = a + 2.2n;
tx.maxPriorityFeePerGas * 1.2n

// yeah
const a = 100
const b = a + 220;
tx.maxPriorityFeePerGas * 12n / 10n

[Bot80926]

thx for you reply!! ethers.BigNumber.from(1.2) it does comes out error. but 12n / 10n also can't meet my needs, since 12n / 10n => 1n, still not find a way to express tx.maxPriorityFeePerGas * 1.2 in V6.

[zemse]

If you multiply your number e.g. 100 with 12n / 10n then first mul should take place then divide 100n * 12n / 10n so you get 120n which is the same as 100 * 1.2 (though if the denominator is not divisible in the main number then there might be some round down)

[Bot80926]

So this way is very unfriendly to frontbot. But very appreciate your help :)