pissang commented on a change in pull request #13013:
URL: 
https://github.com/apache/incubator-echarts/pull/13013#discussion_r459872522



##########
File path: src/chart/line/LineSeries.ts
##########
@@ -103,6 +103,8 @@ export interface LineSeriesOption extends 
SeriesOption<LineStateOption, ExtraSta
     showAllSymbol?: 'auto'
 
     data?: (LineDataValue | LineDataItemOption)[]
+
+    bolderWhenHover?: boolean

Review comment:
       <del>I think we can just ignore `emphasis.bolder` if 
`emphasis.lineStyle.width` is specified.</del>
   
   Another thought just comes in my mind: can `emphasis.lineStyle.width` be a 
semantic value like `'bolder'`?
   
   ```ts
   emphasis: {
     lineStyle: {
       width: 'bolder'
     }
   }
   ```
   
   Just like font-weight in CSS. @100pah What do you think about this?




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