Factory for classes using a closure to set initial state.

class-factory.js

'use strict';
class Component {
  constructor(props) {
    this._props = props;
  }
  get props() {
    return this._props;
  }
  set props(p) {
    this._props = p;
  }
}

function Factory(stuff) {
  class Thing extends Component {
    constructor() {
      super(stuff);
    }
  }
  return Thing;
}

const T = Factory('T');
new T().props; // 'T'

const U = Factory('U');
new U().props; // 'U'