Make the animation smoother.

Is your feature request related to a problem? Please describe.
I want to show the number of total results (for pagination and for feedback to my users). The result field nbHits is updated by the search string but is not updated by the filters that are given. Because of that it is impossible to give a total count to the users and make a good pagination.

Describe the solution you'd like

currently, some of the programs use static type checking like this program but some of the programs did not use static typing.

it's a good practice to use static typing as it makes code more clear and readable, should we make it a standard for this repository.we can use mypy for