需要在项目中安装 am4themes_animated 包，并在需要使用该主题的文件中添加正确的导入语句。例如：

安装 am4themes_animated：

npm install am4themes_animated

在需要使用该主题的文件中添加导入语句：

import am4themes_animated from "@amcharts/amcharts4/themes/animated";

在使用 amCharts 绘图之前，需要调用 am4core.useTheme 函数来加载主题：

import * as am4core from "@amcharts/amcharts4/core";
import * as am4charts from "@amcharts/amcharts4/charts";

import am4themes_animated from "@amcharts/amcharts4/themes/animated";

// 加载主题
am4core.useTheme(am4themes_animated);

// 创建图表
let chart = am4core.create("chartdiv", am4charts.XYChart);
// ...