Linter · Rules

unicorn/no-unnecessary-array-flat-depth

Disallow passing 1 as the depth to Array#flat()

flat() flattens one level by default, so the 1 in flat(1) does nothing.

--fix-suggestions removes the argument.

Configure

Off by default. To turn it on:

bunfig.toml

[lint.rules]
"unicorn/no-unnecessary-array-flat-depth" = "error" # or "warn"

Reported:

const tags = posts.map(post => post.tags).flat(1);

Not reported:

const tags = posts.map(post => post.tags).flat();

const leaves = tree.flat(2);
const everything = tree.flat(Infinity);