StandardJS and React class export Unexpected token =

Can anyone shed some light on the notice I am getting back from StandardJS?

Parsing error: Unexpected token =

Code is as follows:

export default class foreignDataFormat extends _base {
    static input = class ForeignDataFormatInput extends React.Component {
        render () {

        }
    }
}

The error is referring to the second line input = class

In JavaScript, class cannot be defined as static. But method can be defined as static. You would just define (and probably mean to define) the class like:

export default class foreignDataFormat extends _base {
    const input = class ForeignDataFormatInput extends React.Component {
        static myMethod() { 
          //... my static method
        }
        render () {

        }
    }
}

You may be interested to see this post.