ChepteaCatalin commented on issue #19064:
URL: https://github.com/apache/echarts/issues/19064#issuecomment-1718004681
@yay I suggest you use the following workaround, which appears less awkward:
```typescript
tooltip: {
formatter: (params: echarts.DefaultLabelFormatterCallbackParams)
=> {
return `${params.name}, ${params.seriesName}`;
}
} as echarts.TooltipComponentOption
```
`params` is expected to be of type `TooltipComponentFormatterCallbackParams`
which is an alias for
```typescript
type TopLevelFormatterParams = CallbackDataParams | CallbackDataParams[];
```
TypeScript will try to infer the most general type from the union that
encompasses both possibilities even if you want to infer only
`CallbackDataParams` type. In your case, `CallbackDataParams[]` is inferred
because it's more general than just `CallbackDataParams`. So, you have to set
explicitly that you want `CallbackDataParams`, which is exported as
`DefaultLabelFormatterCallbackParams`.
As mentioned in the
[documentation](https://echarts.apache.org/en/option.html#tooltip.formatter),
`params` can take the form of either an object or an array so I don't think
that we should change anything in the library. @plainheart, what are your
thoughts on this?
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