Versions

no-constructor-return

Disallow returning value from constructor

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 with flow control is allowed.

Examples of incorrect code for this rule:

/*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:

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

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

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

f();
}
}

Version

This rule was introduced in ESLint v6.7.0.

Resources