// Ref: https://github.com/ethereum/wiki/wiki/JSON-RPC import BN from 'bn.js'; import { toBuffer, addHexPrefix, bufferToHex } from 'ethereumjs-util'; import { trimStart } from 'lodash'; // When encoding QUANTITIES (integers, numbers): encode as hex, prefix with "0x", the most compact representation (slight exception: zero should be represented as "0x0"). export function hexEncodeQuantity(value: BN | Buffer): string { const trimmedValue = trimStart((value as any).toString('hex'), '0'); //TODO: fix typing return addHexPrefix(trimmedValue === '' ? '0' : trimmedValue); } // When encoding UNFORMATTED DATA (byte arrays, account addresses, hashes, bytecode arrays): encode as hex, prefix with "0x", two hex digits per byte. export function hexEncodeData(value: string | Buffer): string { return bufferToHex(toBuffer(value)); }