Evm Bn

Convert fixed-point numbers to ethers big numbers and vice-versa. This is useful for EVM-related projects, since 1 ETH is 1e18 wei.

• Accepts scientific notation.
• Limits the precision to 78 digits.
• Enforces 60 integer digits and 18 fractional digits.
• Designed to be used alongside @ethersproject/bignumber.
• Slices the fractional digits automatically at position n + 1 and above, with n the number of decimals, rounding down in the process.

Install

With yarn:

1$ yarn add evm-bn

Or npm:

1$ npm install evm-bn

Usage

To Bn

1import type { BigNumber } from "@ethersproject/bignumber";
2import { toBn } from "evm-bn";
3
4// 3141500000000000000
5const foo: BigNumber = toBn("3.1415");
6
7// 115792089237316195423570985008687907853269984665640564039457584007913129639935
8const bar: BigNumber = toBn("115792089237316195423570985008687907853269984665640564039457.584007913129639935");
9
10// 100000000000000
11const baz: BigNumber = toBn("100e6", 6);

From Bn

1import type { BigNumber } from "@ethersproject/bignumber";
2import { fromBn } from "evm-bn";
3
4// 3.1415
5const foo: BigNumber = fromBn(BigNumber.from("3141500000000000000"));
6
7// 115792089237316195423570985008687907853269984665640564039457.584007913129639935
8const bar: BigNumber = fromBn(
9  BigNumber.from("115792089237316195423570985008687907853269984665640564039457584007913129639935"),
10);
11
12// 100000000
13const baz: BigNumber = fromBn(BigNumber.from("100000000000000"), 6);

Contributing

Feel free to dive in! Open an issue, start a discussion or submit a PR.

Set Up

Clone the repositories and install the dependencies:

1$ yarn install

Now you can start making changes.

License

MIT © Paul Razvan Berg