To easily flatten a contract using Foundry instead of Remix.

[Samuel1-ona]

Proposal

In the documentation, I noticed that when verifying contracts on Klaytnscope, the contracts need to be flattened. It was mentioned that developers can use Remix for this purpose. Therefore, I want to include an easy Foundry and Hardhat command to simplify the process of flattening a large codebase that will be built on the Klaytn blockchain.

To flatten on Foundry

Flattening a large codebase using Foundry is straightforward. Simply run the command below, and Foundry will automatically create a Contract.flattened.sol file in the src directory. This file will contain all the contracts in the codebase that have been flattened. Use the following command:

forge flatten --output src/Contract.flattened.sol src/Contract.sol

To flatten on Hardhat

Hardhat flattening commands are quite similar to Foundry. You create a file called flatten.sol in the src directory and run the Hardhat command below:

npx hardhat flatten contracts/Contract1.sol > Flattened.sol
If you have multiple contracts that are not dependent on each other, you can run this command:

npx hardhat flatten contracts/Contract1.sol contracts/Contract2.sol > Flattened.sol