src/content/docs/linter/rules/no-flat-map-identity.mdx
import { Tabs, TabItem } from '@astrojs/starlight/components';
<Tabs> <TabItem label="JavaScript (and super languages)" icon="seti:javascript"> ## Summary - Rule available since: `v1.7.0` - Diagnostic Category: [`lint/complexity/noFlatMapIdentity`](/reference/diagnostics#diagnostic-category) - This rule is **recommended**, meaning it is enabled by default. - This rule has an [**unsafe**](/linter/#unsafe-fixes) fix. - The default severity of this rule is [**information**](/reference/diagnostics#information). - Sources: - Same as [`flat_map_identity`](https://rust-lang.github.io/rust-clippy/master/#flat_map_identity){
"linter": {
"rules": {
"complexity": {
"noFlatMapIdentity": "error"
}
}
}
}
Disallow to use unnecessary callback on flatMap.
To achieve the same result (flattening an array) more concisely and efficiently, you should use flat instead.
array.flatMap((arr) => arr);
array.flatMap((arr) => {return arr});
array.flatMap((arr) => arr * 2);