How to use the @material/textfield/index.MDCTextField function in @material/textfield

initTextField = ele => ele && this.componentInstances.push(
      new MDCTextField(ele));

  tfRef = (el) => el && new MDCTextField(el);

installed() {
    this.mdc = new MDCTextField(this.root)
  }

componentDidUpdate() {
    if (this.textField) {
      this.textField.destroy();
      this.textField = null;
    }
    if (this.tfEl) {
      this.textField = new MDCTextField(this.tfEl);
    }
  }

initRef = (el) => {
    if (el) {
      this.tfEl = el;
      this.textField = new MDCTextField(el);
    }
  };

      <div> textFieldEl &amp;&amp; new MDCTextField(textFieldEl)}&gt;
        {characterCounter &amp;&amp; textarea ?  : null}</div>