Change which rules are unsafe for precommit hooks

[richardgill]

I'd like to have different biome rules in my IDE and my lefthook pre-commit hook.

• In my IDE I do not want to fix lint/correctness/noUnusedImports on save.
• But on my pre-commit hook I do want to fix this.

Currently I have lint/correctness/noUnusedImports marked as unsafe.

So to fix it I have to run: biome check --write --unsafe, but this will fix many other unsafe things, which I don't want.

I tried creating a biome.precommit.jsonc (adjacent to biome.jsonc):

{
  "extends": ["./biome.jsonc"],
  "root": false,
  "linter": {
    "rules": {
      "correctness": {
        "noUnusedImports": {
          "fix": "safe" // Override to make it safe for pre-commit
        }
      }
    }
  }
}

And running biome check --write --unsafe --config=./biome.precommit.jsonc

This fails with:

  ✖ Found a nested root configuration, but there's already a root configuration.

  ℹ The other configuration was found in .

  ℹ Use the migration command from the root of the project to update the configuration.

  $ biome migrate --write

---

  ✖ Biome exited because the configuration resulted in errors. Please fix them.

How can I achieve what I want? I think perhaps this is a bug in biome when running with --config?

[siketyan]

"root": false is not intended to be here. Can you try removing and try again?

[richardgill]

Thanks @siketyan, tried it, same error!