Discrepancy between the Universal Router technical reference and the `Commands.sol` library

[igorroncevic]

I've noticed that there is a large discrepancy between the commands that are noted down in the Universal Router technical docs and the Commands.sol library in the uniswap/universal-router repo.

Notably, V4_SWAP is not even mentioned, which is a big deal given the fact that it has actions encoded within it, so detailed guide on what those do would be useful to have in the Technical Reference page.

[cqlyj]

I've faced the same issue and resolved it by specifying the latest commit hash when installing the dependency. You can try installing it like this if you are using foundry:

forge install uniswap/universal-router@8bd498a --no-commit

And if you also facing issues like incorrect import paths, my solution is install the v2 and v3 core contracts as below:

forge install uniswap/v2-core --no-commit 
forge install uniswap/v3-core --no-commit

And update the remapping for them.

This ensures you're using a version that includes V4_SWAP. However, I agree that the documentation should be updated to reflect this command properly, especially given its importance.

[Hugoo]

💯 - the article here: https://docs.uniswap.org/contracts/v4/quickstart/swap#32-encoding-the-swap-command

mentions the command, but the command is not on the Command page:

https://docs.uniswap.org/contracts/universal-router/technical-reference#command

Current Commands page on the docs:

Value in the repo:

https://github.com/Uniswap/universal-router/blob/main/contracts/libraries/Commands.sol#L35

[Dayitva]

Thanks for creating the issue. It's fixed now!