Foundry

Foundry is a fast toolkit for application development written in Rust equipped with a testing framework, as well as utilities for interacting with smart contracts and getting chain data. We’re going to use the FEVM Foundry Kit repository to get started.

The template repository contains submodules and remappings for ds-test assertions for testing, solmate building blocks for contracts, and forge-std to layer on top of evm cheatcodes to improve UX.

Prerequisites #

You must have the following installed:

• Git
• Yarn

You should also have an address on the Filecoin Hyperspace testnet. See the Add to MetaMask page for information on how to get an address. You also need test-FIL tFIL in your wallet. See the Use a Faucet page for information on how to get test funds.

Steps #

1. Clone the xBalbinus/fevm-foundry-kit repository and move into the fevm-foundry-kit directory:

   git clone https://github.com/xBalbinus/fevm-foundry-kit/tree/main.git
   cd fevm-foundry-kit
   

2. Install the project dependencies with Yarn:

   yarn install
   

3. Export your private key from MetaMask. See the MetaMask documentation to find out how to export your private key.

4. In your .env.example, create an environment variable called PRIVATE_KEY and paste in the private key from MetaMask. Also, do the same for the HYPERSPACE_RPC_URL. Then rename the file to .env:

   PRIVATE_KEY=eed8e9d727a647f7302bab440d405ea87d36726e7d9f233ab3ff88036cfbce9c
   HYPERSPACE_RPC_URL=https://api.hyperspace.node.glif.io/rpc/v1
   

5. Inside the src folder in a contract called SimpleCoin.sol. Deploy this contract using Foundry:

   forge build
   forge script script/SimpleCoin.s.sol:MyScript --rpc-url https://api.hyperspace.node.glif.io/rpc/v1 --broadcast --verify -vvvv
   

   ...
   
   Script ran successfully.
   Gas used: 234642
   

   Alternatively, you can do the same using the forge create command:

   forge build
   
   forge create --rpc-url https://api.hyperspace.node.glif.io/rpc/v1 --private-key $PRIVATE_KEY src/SimpleCoin.sol:SimpleCoin
   

   The deployment process should be almost instantaneous. Once the contract has been successfully deployed, Foundry will give you a contract address you can use to interact with the contract.

6. You can now interact with your contract using the contract address given by Foundry.

7. Done! For more information, see the Foundry book.