new echarts.graphic.LinearGradient报错

//使用echarts.graphic.LinearGradient控制台报错
// 默认的引入方式
import echarts from 'echarts 
 // 修改后的引入方式(默认的引入导出方式没有暴露echarts.graphic.LinearGradient相关功能)
import * as echarts from 'echarts'

...

 itemStyle: {
              normal: {
                barBorderRadius: [0, 10, 10, 0],
                color: new echarts.graphic.LinearGradient(0, 0, 1, 1, [{
                  offset: 0,
                  color: "rgba(255, 149, 37, .7)" // 0% 处的颜色
                }, {
                  offset: 0.2,
                  color: "rgba(254, 174, 19, .7)" // 60% 处的颜色
                }, {
                  offset: 1,
                  color: "rgba(255, 188, 11, 1)" // 100% 处的颜色
                }], false)
              }
            },

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