echarts渐变色报错（部署到服务器报错） TypeError: Cannot set properties of undefined (setting ‘colorStops‘)

umi.js:1 TypeError: Cannot set properties of undefined (setting 'colorStops')
    at t (umi.js:1:889039)
    at e (umi.js:1:889192)
    at umi.js:1:1663003
    at ul (umi.js:1:2992657)
    at e.unstable_runWithPriority (umi.js:1:3163575)
    at go (umi.js:1:2932781)
    at ol (umi.js:1:2992118)
    at umi.js:1:2992029
    at R (umi.js:1:3162634)
    at x.port1.onmessage (umi.js:1:3161356)

经过排查，出现问题的代码为：

color: echarts.graphic.LinearGradient(...省略参数)

解决办法：

引入

import * as echarts from 'echarts';

并将color: echarts.graphic.LinearGradient(...省略参数)修改为

color: new echarts.graphic.LinearGradient