`prefer-array-flat` fix is not safe #2660

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Manu1400 opened this issue May 28, 2025 · 1 comment

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bug

Manu1400 commented May 28, 2025

Same issue in Biome linter: biomejs/biome#6142

Rule prefer-array-flat fix is not safe.

const randomObject = {
  flatMap(f) {
    f()
  }
}

randomObject.flatMap((x) => x)

testcase

https://biomejs.dev/playground/?code=YwBvAG4AcwB0ACAAcgBhAG4AZABvAG0ATwBiAGoAZQBjAHQAIAA9ACAAewAKACAAIABmAGwAYQB0AE0AYQBwACgAZgApACAAewAKACAAIAAgACAAZgAoACkACgAgACAAIAAgAGMAbwBuAHMAbwBsAGUALgBsAG8AZwAoACIAaABpACIAKQAKACAAIAB9AAoAfQAKAAoAcgBhAG4AZABvAG0ATwBiAGoAZQBjAHQALgBmAGwAYQB0AE0AYQBwACgAKAB4ACkAIAA9AD4AIAB4ACkA

Manu1400 added the bug label

woody-li commented Jun 3, 2025

Maybe related to #2007

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