There are several reasons for a function not to have a function body:

• It is an unintentional omission, and should be fixed to prevent an unexpected behavior in production.
• It is not yet, or never will be, supported. In this case an exception should be thrown in languages where that mechanism is available.
• The method is an intentionally-blank override. In this case a nested comment should explain the reason for the blank override.

Noncompliant Code Example

function foo() {
}

var foo = () => {};

Compliant Solution

function foo() {
    // This is intentional
}

var foo = () => {
    do_something();
};

Exceptions

• This rule does not apply to function expressions and arrow functions as they can denote default values.

static defaultProps = {
  listStyle: () => {}
};

• The rule allows for empty functions with a name starting with the prefix on like onClick.

function onClick() {
}