Adding on to the other comment about CI setups, when I benchmarked removing eslint-plugin-prettier from my work’s ESLint configuration we saw a 37.5% speedup. On our fairly slow CI agents that ended up being pretty significant (~34s per run).
I _wanted_ to drop the plugin and have Prettier automatically run on as a pre-commit hook (as you suggested) but in the end I lost :) We wound up keeping the plugin and eating the slower pipeline time.
Of course there’s more overhead than just Prettier in this case—the ESLint plugin itself will be contributing towards the added runtime!—but depending on your codebase and CI machines, Prettier can definitely slow things down quite a bit. CI taking over a minute or two is a big drag on developer productivity imo.
Ideal world is that everyone is on board with code formatting as a pre-commit task that only touches modified files so it doesn’t bloat CI unnecessarily, but it’s not always possible :(
I’ve done some research on this in the past. The reason that is so slow is because the eslint plugin runs prettier, does a diff between the result of prettier and the real file and then converts each diff entry into a eslint issues. Most of the pain comes from this remarshaling cost
What we did to avoid that bottleneck was just turn off the prettier eslint rule in CI and just run the `prettier --check` command they recommend in their docs.
We also have it set to only run in changed files which helps a lot.
We generally don't link pre-commit hooks for standards though, hence the CI focus. Too easy to circumvent, and I'd rather pay for an external machine to check it when it matters (pre-merge by doing it on PR commits) than block my devs when it doesn't (every time they commit to a non-main branch).
I _wanted_ to drop the plugin and have Prettier automatically run on as a pre-commit hook (as you suggested) but in the end I lost :) We wound up keeping the plugin and eating the slower pipeline time.
Of course there’s more overhead than just Prettier in this case—the ESLint plugin itself will be contributing towards the added runtime!—but depending on your codebase and CI machines, Prettier can definitely slow things down quite a bit. CI taking over a minute or two is a big drag on developer productivity imo.
Ideal world is that everyone is on board with code formatting as a pre-commit task that only touches modified files so it doesn’t bloat CI unnecessarily, but it’s not always possible :(