unicorn/prefer-array-flat-map Perf

🛠️ An auto-fix is available for this rule.

Prefers the use of .flatMap() when map().flat() are used together.

It is slightly more efficient to use .flatMap(…) instead of .map(…).flat().

Examples of incorrect code for this rule:

javascript

const bar = [1, 2, 3].map(i => [i]).flat();

Examples of correct code for this rule:

javascript

const bar = [1, 2, 3].flatMap(i => [i]);

How to use

To enable this rule in the CLI or using the config file, you can use:

CLIConfig (.oxlintrc.json)

bash

oxlint --deny unicorn/prefer-array-flat-map

json

{
  "rules": {
    "unicorn/prefer-array-flat-map": "error"
  }
}