unicorn/prefer-math-min-max is incorrectly reporting variables of bigint type.
Its autofix generates invalid code.

package.json

{
  "private": true,
  "type": "module",
  "packageManager": "[email protected]+sha512.76e2379760a4328ec4415815bcd6628dee727af3779aaa4c914e3944156c4299921a89f976381ee107d41f12cfa4b66681ca9c718f0668fa0831ed4c6d8ba56c",
  "dependencies": {
    "typescript": "~5.7.2",
    "xo": "^0.60.0"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "forceConsistentCasingInFileNames": true,
    "lib": [
      "DOM",
      "ES2023"
    ],
    "module": "ES2022",
    "moduleResolution": "Bundler",
    "noEmitOnError": true,
    "noImplicitOverride": true,
    "noImplicitReturns": true,
    "noUncheckedIndexedAccess": true,
    "noUnusedLocals": true,
    "strict": true,
    "target": "ES2023"
  },
  "include": [
    "main.ts"
  ],
  "exclude": [
    "**/node_modules"
  ]
}

main.ts

export function f(a: bigint, b = 0n) {
	return a > b ? a : b;
}

Command Line

./node_modules/.bin/xo

Error Message

  main.ts:2:9
  ✖  2:9  Prefer Math.max() to simplify ternary expressions.  unicorn/prefer-math-min-max

  1 error

Autofix Result and TypeScript Error

export function f(a: bigint, b = 0n) {
	return Math.max(a, b);
}

main.ts:2:18 - error TS2345: Argument of type 'bigint' is not assignable to parameter of type 'number'.

2  return Math.max(a, b);
                   ~


Found 1 error in main.ts:2