useHasValue

The useHasValue primitive returns a boolean indicating whether a given Value exists in the Store, and registers a listener so that any changes to that result will cause an update.

useHasValue(
  valueId: MaybeAccessor<string>,
  storeOrStoreId?: MaybeAccessor<undefined | StoreOrStoreId>,
): Accessor<boolean>

A Provider component is used to wrap part of an application in a context, and it can contain a default Store or a set of Store objects named by Id. The useHasValue primitive lets you indicate which Store to get data for: omit the optional parameter for the default context Store, provide an Id for a named context Store, or provide a Store explicitly by reference.

When first rendered, this primitive will create a listener so that changes to the Value will cause an update. When the component containing this primitive is unmounted, the listener will be automatically removed.

import {createRoot} from 'solid-js';
import {createStore} from 'tinybase';
import {useHasValue} from 'tinybase/ui-solid';

createRoot((dispose) => {
  const store = createStore().setValue('open', true);
  const hasOpen = useHasValue('open', store);
  console.log(hasOpen());
  // -> true
  dispose();
});