How to use the @microsoft/sp-lodash-subset.extend function in @microsoft/sp-lodash-subset

private _renderTodoComponent(partialData?: ITodoComponentData): void {
    lodash.extend(this._todoComponentData, partialData);

    ReactDOM.render(
       as React.ReactElement,
      this.domElement
    );
  }

private _renderTodoComponent(partialData?: ITodoComponentData): void {
    lodash.extend(this._todoComponentData, partialData);

    ReactDOM.render(
       as React.ReactElement,
      this.domElement
    );
  }

private _renderTodoComponent(partialData?: ITodoComponentData): void {
    lodash.extend(this._todoComponentData, partialData);

    ReactDOM.render(
       as React.ReactElement,
      this.domElement
    );
  }