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Dropdown arrow can be customized on popup open and close. It can be handled in beforeOpen and beforeClose event.

In the following example, the up arrow is updated on popup close and down arrow is updated on popup open using beforeOpen and beforeClose event by adding and removing e-caret-up class.

Source
Preview
app.tsx
index.html
styles.css
import * as React from 'react';
import * as ReactDom from 'react-dom';
import { DropDownButtonComponent, ItemModel } from '@syncfusion/ej2-react-splitbuttons';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

// To render DropDownButton.
class App extends React.Component<{}, {}> {

  public items: ItemModel[] = [
    {
        text: 'Cut'
    },
    {
        text: 'Copy'
    },
    {
        text: 'Paste'
    }];

    // To update up arrow with `e-caret-up` class.
    public beforeOpen (args: BeforeOpenCloseMenuEventArgs) {
        this.cssClass = 'e-caret-up';
    }
    // To remove `e-caret-up` class.
    public beforeClose (args: BeforeOpenCloseMenuEventArgs) {
        this.cssClass = '';
    }

  render() {
    return (
    <div>
      <DropDownButtonComponent items = {this.items} beforeOpen={this.beforeOpen} beforeClose={this.beforeClose}> Clipboard</DropDownButtonComponent>
      </div>
    );
  }
}
ReactDom.render(<App />,document.getElementById('button'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React DropDownButton</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <link href="styles.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='button'>
        <div id='loader'>Loading...</div>
    </div>
</body>

</html>
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

.e-caret {
  transform: rotate(0deg);
  transition: transform 200ms ease-in-out;
}

.e-caret-up .e-caret {
  transform: rotate(180deg);
}
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