ChepteaCatalin commented on issue #19064:
URL: https://github.com/apache/echarts/issues/19064#issuecomment-1724900414
> Sorry if I'm misunderstanding something but I'm also getting this type
error (given the solution above):
>
> ```
> Type '{ trigger: "axis"; axisPointer: { type: "shadow"; }; formatter:
(params: CallbackDataParams[]) => string |
TooltipFormatterCallback<TopLevelFormatterParams> | undefined; }' is not
assignable to type 'TooltipOption | TooltipOption[] | undefined'.
> Types of property 'formatter' are incompatible.
> Type '(params: CallbackDataParams[]) => string |
TooltipFormatterCallback<TopLevelFormatterParams> | undefined' is not
assignable to type 'string | TooltipFormatterCallback<TopLevelFormatterParams>
| undefined'.
> Type '(params: CallbackDataParams[]) => string |
TooltipFormatterCallback<TopLevelFormatterParams> | undefined' is not
assignable to type 'TooltipFormatterCallback<TopLevelFormatterParams>'.
> Types of parameters 'params' and 'params' are incompatible.
> Type 'TopLevelFormatterParams' is not assignable to type
'CallbackDataParams[]'.
> Type 'CallbackDataParams' is missing the following properties
from type 'CallbackDataParams[]': length, pop, push, concat, and 35
more.ts(2322)
> ```
>
> This is how I typed the function:
>
> ```ts
> formatter: function(params: echarts.DefaultLabelFormatterCallbackParams[])
{
> ```
Try tot type the function as follows:
```ts
formatter: function(params: echarts.DefaultLabelFormatterCallbackParams) {
```
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