renderContent_(contentContainer) {
    const varNameContainer = this.createVarNameContainer_();
    this.variableNameInput_ = varNameContainer.querySelector(
      '.typedModalVariableNameInput',
    );

    const typedVarDiv = document.createElement('div');
    typedVarDiv.className = 'typedModalTypes';
    typedVarDiv.textContent = Blockly.Msg['TYPED_VAR_MODAL_TYPES_LABEL'];

    this.variableTypesDiv_ = this.createVariableTypeContainer_(this.types_);
    this.resetModalInputs_();
    typedVarDiv.appendChild(this.variableTypesDiv_);
    contentContainer.appendChild(varNameContainer);
    contentContainer.appendChild(typedVarDiv);
  }
Render content for the modal content div.
@param {HTMLDivElement} contentContainer The modal's content div.
@override