sthenault opened a new issue #14279:
URL: https://github.com/apache/echarts/issues/14279


   ### Version
   5.0.2
   
   ### Steps to reproduce
   Use a callback function for itemStyle.color as documented leads to a 
compilation error. E.g.
   
                   itemStyle: {
                       color: (param: any) => data[param.dataIndex].color,
                   },
   
   ### What is expected?
   no compilation error. 
   
   ### What is actually happening?
   typescript complains:
   
         Type '(param: any) => string' is not comparable to type 'ZRColor'.
           Type '(param: any) => string' is missing the following properties 
from type 'PatternObject': type, image, svgElement, svgWidth, and 2 more.
   
   ---
   Bonus point for exposing a type for 'params' better than Object.
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   <!-- This issue is in English. DO NOT REMOVE -->


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