• Run git submodule update --init --recursive to update/download all libraries.
• Run yarn install to install any additional dependencies.

• Install solidity extension https://marketplace.visualstudio.com/items?itemName=juanblanco.solidity
• Navigate to a .sol file
• Right-click, select Solidity: Change global compiler version (Remote)

• Select 0.7.6

• Install solhint extension https://marketplace.visualstudio.com/items?itemName=idrabenia.solidity-solhint

Install Foundry CLI (forge 0.2.0) from official website.

• To install a specific verison, see here.

Run forge test to run test using installed forge cli or make test to run tests in docker container.

Log level is controlled by the -v flag. For example, forge test -vv displays console.log() statements from within contracts. Highest verbosity is -vvvvv. More info: https://book.getfoundry.sh/forge/tests.html#logs-and-traces. Contracts that use console.log() must import lib/forge-std/src/console.sol.

Run make anvil-test to setup anvil test node in docker container and run integration tests. There is an example in anvil/ folder

Run yarn lint to lint all .sol files in the src and test directories.

Run make analyze to set up Python dependencies from requirements.txt and run Slither on all source files, requiring the foundry cli to be installed locally. If all dependencies have been installed, alternatively run slither . to run static analysis on all .sol files in the src directory.

We use Github actions to run linter and all the tests. The workflow configuration can be found in .github/workflows/ci.yml

Use Docker to run Foundry commands. Run make build to build Foundry docker image. Then run docker run --rm foundry "<COMMAND>" to run any forge, anvil or cast commands. There are some pre defined commands available in Makefile for testing and deploying contract on anvil. More info on Docker and Foundry here.

ℹ️ Note

• Some machines (including those with M1 chips) may be unable to build the docker image locally. This is a known issue.

The contracts are deployed using Forge Scripts. The script is located in scripts/deploy.s.sol. Follow the below steps to deploy the contracts:

1. Add the below environment variables to your env file

   • MESSAGE_TRANSMITTER_DEPLOYER_KEY
   • TOKEN_MESSENGER_DEPLOYER_KEY
   • TOKEN_MINTER_DEPLOYER_KEY
   • TOKEN_CONTROLLER_DEPLOYER_KEY
   • ATTESTER_ADDRESS
   • USDC_CONTRACT_ADDRESS
   • REMOTE_USDC_CONTRACT_ADDRESS
   • MESSAGE_TRANSMITTER_PAUSER_ADDRESS
   • TOKEN_MINTER_PAUSER_ADDRESS
   • MESSAGE_TRANSMITTER_RESCUER_ADDRESS
   • TOKEN_MESSENGER_RESCUER_ADDRESS
   • TOKEN_MINTER_RESCUER_ADDRESS
   • TOKEN_CONTROLLER_ADDRESS
   • DOMAIN
   • REMOTE_DOMAIN
   • BURN_LIMIT_PER_MESSAGE

   In addition, to link the remote bridge, one of two steps needs to be followed:

   • Add the REMOTE_TOKEN_MESSENGER_DEPLOYER address to your env file and run scripts/precomputeRemoteMessengerAddress.py with argument --REMOTE_RPC_URL for the remote chain, which will automatically add the REMOTE_TOKEN_MESSENGER_ADDRESS to the .env file
   • Manually add the REMOTE_TOKEN_MESSENGER_ADDRESS to your .env file.

2. Run make simulate RPC_URL=<RPC_URL> SENDER=<SENDER> to perform a dry run. Note: Use address from one of the private keys (used for deploying) above as sender. It is used to deploy the shared libraries that contracts use

3. Run make deploy RPC_URL=<RPC_URL> SENDER=<SENDER> to deploy the contracts