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.