error TS2339: Property 'field' does not exist on type 'FilterDescriptor | CompositeFilterDescriptor'.

[Masip]

https://stackblitz.com/edit/angular-xrfu5g-6fw38x

Error: src/app/app.component.ts:91:83 - error TS2339: Property 'field' does not exist on type 'FilterDescriptor | CompositeFilterDescriptor'.

Hi

what is mistake ?

Regards

 

[Georgi]

Hi Masip,

Thank you for providing a runnable example relevant to your request.

It looks like the error is present for the following reason:

this.state.filter.filters in your example is of type CompositeFilterDescriptor.

The filters field of a CompositeFilterDescriptor can be a CompositeFilterDescriptor, but it can also be a simple FilterDescriptor.

Since of these two types, only FilterDescriptor has a field property, TypeScript is giving a warning that essentially a CompositeFilterDescriptor does not have a field property.

To get around the error, the type of the filters property can be narrowed down to a FilterDescriptor, and the error goes away.

Here is a runnable example with the fix (line 128):

https://stackblitz.com/edit/angular-fnxykh?file=app/app.component.ts

 

Please let me know if this helps.

Regards,
Georgi
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