$ cd /tmp
$ mkdir foo
$ cd foo
$ git init
$ cat > .pre-commit-config.yaml 
repos:
  - repo: https://github.com/biomejs/pre-commit
    rev: v2.2.0 # Use the sha / tag you want to point at
    hooks:
      - id: biome-check
^D
$ echo 'function(a) {}' > main.ts
$ git add .
$ pre-commit run --all-files
biome check..............................................................Passed

main.ts:1:10 lint/correctness/noUnusedVariables  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ This function f is unused.
  
  > 1 │ function f(a) {}
      │          ^
    2 │ 
  
  ℹ Unused variables are often the result of an incomplete refactoring, typos, or other sources of bugs.
  
  ℹ Unsafe fix: If this is intentional, prepend f with an underscore.
  
    1   │ - function·f(a)·{}
      1 │ + function·_f(a)·{}
    2 2 │   
  

main.ts:1:12 lint/correctness/noUnusedFunctionParameters  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ This parameter is unused.
  
  > 1 │ function f(a) {}
      │            ^
    2 │ 
  
  ℹ Unused parameters might be the result of an incomplete refactoring.
  
  ℹ Unsafe fix: If this is intentional, prepend a with an underscore.
  
    1   │ - function·f(a)·{}
      1 │ + function·f(_a)·{}
    2 2 │   
  

Checked 1 file in 2ms. No fixes applied.
Found 2 warnings.