Foundry

Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.

Foundry consists of:

Forge: Ethereum testing framework (like Truffle, Hardhat and DappTools).
Cast: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
Anvil: Local Ethereum node, akin to Ganache, Hardhat Network.
Chisel: Fast, utilitarian, and verbose solidity REPL.

Documentation

https://book.getfoundry.sh/

Usage

Build

$ forge build

Test

$ forge test

Format

$ forge fmt

Gas Snapshots

$ forge snapshot

Anvil

$ anvil

Deploy

$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>

Cast

$ cast <subcommand>

Deployment to a testnet or mainnet

Setup environment variables

You'll want to set your SEPOLIA_RPC_URL and PRIVATE_KEY as environment variables. You can add them to a .env file, similar to what you see in .env.example.

PRIVATE_KEY: The private key of your account (like from metamask). NOTE: FOR DEVELOPMENT, PLEASE USE A KEY THAT DOESN'T HAVE ANY REAL FUNDS ASSOCIATED WITH IT.
- You can learn how to export it here.
SEPOLIA_RPC_URL: This is url of the sepolia testnet node you're working with. You can get setup with one for free from Alchemy

Optionally, add your ETHERSCAN_API_KEY if you want to verify your contract on Etherscan.

Get testnet ETH

Head over to faucets.chain.link and get some testnet ETH. You should see the ETH show up in your metamask.

Deploy

make deploy ARGS="--network sepolia"

Scripts

After deploy to a testnet or local net, you can run the scripts.

Using cast deployed locally example:

cast send <ERC20_CONTRACT_ADDRESS> "transfer()"  --value 0.1ether --private-key <PRIVATE_KEY> --rpc-url $SEPOLIA_RPC_URL

or, to create a ChainlinkVRF Subscription:

make createSubscription ARGS="--network sepolia"

Estimate gas

You can estimate how much gas things cost by running:

forge snapshot

And you'll see and output file called .gas-snapshot

Formatting

To run code formatting:

forge fmt

Help

$ forge --help
$ anvil --help
$ cast --help

shrxyeh/ERC20