Why is wix-store-backend missing ?

When I deploy my site it could not import wix store back end and says it is missing. Is it deprecated ?

The first question would be have you got it in a backend file on your site?

Then the next question would be have you included that backend function in your imports on your page code?

https://www.wix.com/corvid/reference/wix-stores-backend.html
The wix-stores-backend module contains functionality for working with your site’s store from backend code.

To use the Stores API, import wixStoresBackend from the wix-stores-backend module:

import wixStoresBackend from 'wix-stores-backend';