yooki0328 opened a new issue #12955:
URL: https://github.com/apache/incubator-echarts/issues/12955
### Version
4.8.0
### Steps to reproduce
npm run build 进行构建打包， 打包后的代码执行时会出错
### What is expected?
正常运行
### What is actually happening?
Uncaught TypeError: Cannot set property 'uid' of undefined
---
看了源码，出错的地方应该是这里， 是否需要做一下处理？
1. registerProcessor(dataFilter('pie'))
2. function registerProcessor(priority, processor) {
normalizeRegister(dataProcessorFuncs, priority, processor,
PRIORITY_PROCESSOR_FILTER);
}
3. function normalizeRegister(targetList, priority, fn, defaultPriority,
visualType) {
Scheduler.wrapStageHandler(fn, visualType) // 这里传入的fn 为 undefined
}
4. 所以会报错
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