eslint/array-callback-return Pedantic
What it does
Enforce return statements in callbacks of array methods
Why is this bad?
Array has several methods for filtering, mapping, and folding. If we forget to write return statement in a callback of those, it’s probably a mistake. If you don’t want to use a return or don’t need the returned results, consider using .forEach instead.
Examples
Examples of incorrect code for this rule:
javascript
let foo = [1, 2, 3, 4];
foo.map((a) => {
console.log(a);
});Examples of correct code for this rule:
javascript
let foo = [1, 2, 3, 4];
foo.map((a) => {
console.log(a);
return a;
});Configuration
This rule accepts a configuration object with the following properties:
allowImplicitReturn
type: boolean
default: false
When set to true, allows callbacks of methods that require a return value to implicitly return undefined with a return statement containing no expression.
checkForEach
type: boolean
default: false
When set to true, rule will also report forEach callbacks that return a value.
How to use
To enable this rule in the CLI or using the config file, you can use:
bash
oxlint --deny array-callback-returnjson
{
"rules": {
"array-callback-return": "error"
}
}