Package Exports

@eth-optimism/core-utils
@eth-optimism/core-utils/dist/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@eth-optimism/core-utils) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

@eth-optimism/core-utils

What is this?

@eth-optimism/core-utils contains the Optimistic Virtual Machine core utilities.

Getting started

Building and usage

After cloning and switching to the repository, install dependencies:

$ yarn

Use the following commands to build, use, test, and lint:

$ yarn build
$ yarn start
$ yarn test
$ yarn lint

L2 Fees

TxGasLimit can be used to encode and decode the L2 Gas Limit locally.

import { TxGasLimit } from '@eth-optimism/core-utils'
import { JsonRpcProvider } from 'ethers'

const L2Provider = new JsonRpcProvider('https://mainnet.optimism.io')
const L1Provider = new JsonRpcProvider('http://127.0.0.1:8545')

const l2GasLimit = await L2Provider.send('eth_estimateExecutionGas', [tx])
const l1GasPrice = await L1Provider.getGasPrice()

const encoded = TxGasLimit.encode({
  data: '0x',
  l1GasPrice,
  l2GasLimit,
  l2GasPrice: 10000000,
})

const decoded = TxGasLimit.decode(encoded)
assert(decoded.eq(gasLimit))

const estimate = await L2Provider.estimateGas()
assert(estimate.eq(encoded))