---
title: no-constructor-return
rule_type: problem
---


In JavaScript, returning a value in the constructor of a class may be a mistake. Forbidding this pattern prevents mistakes resulting from unfamiliarity with the language or a copy-paste error.

## Rule Details

This rule disallows return statements in the constructor of a class. Note that returning nothing is allowed.

Examples of **incorrect** code for this rule:

::: incorrect

```js
/*eslint no-constructor-return: "error"*/

class A {
    constructor(a) {
        this.a = a;
        return a;
    }
}

class B {
    constructor(f) {
        if (!f) {
            return 'falsy';
        }
    }
}
```

:::

Examples of **correct** code for this rule:

::: correct

```js
/*eslint no-constructor-return: "error"*/

class C {
    constructor(c) {
        this.c = c;
    }
}

class D {
    constructor(f) {
        if (!f) {
            return;  // Flow control.
        }

        f();
    }
}

class E {
    constructor() {
        return;
    }
}

```

:::

## Options

This rule has no options.