@crtxio/abi/lib/es/utils/twos-complement.js

A tiny Solidity ABI encoder and decoder

import { toBuffer } from './buffer';
export const fromTwosComplement = buffer => {
  const bufferValue = toBuffer(buffer);
  let value = 0n;

  for (const byte of bufferValue) {
    value = (value << 8n) + BigInt(byte);
  }

  return BigInt.asIntN(bufferValue.length * 8, value);
};
export const toTwosComplement = (value, length) => {
  const buffer = new Uint8Array(length);

  for (let i = 0; i < buffer.length; i++) {
    buffer[i] = Number(BigInt.asUintN(8, value));
    value = value >> 8n;
  }

  return buffer.reverse();
};
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