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url: /mobx-view-model/v9/api/view-model-store/base-implementation.md
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# `ViewModelStoreBase` class

This is the base implementation of the [`ViewModelStore`](/api/view-model-store/interface) interface.

[Reference to source code](/src/view-model/view-model.store.base.ts)

## Methods and properties

Here is documentation about **base implementation** methods and properties.\
If you need to read about [`ViewModelStore`](/api/view-model-store/interface) interface methods and properties, [go here](/api/view-model-store/interface).

### `viewModels` (*protected*)

Map structure with created [ViewModel](/api/view-models/overview) instances in application.

### `instanceAttachedCount` (*protected*)

[ViewModel](/api/view-models/interface) instances count attached ([method attach()](/api/view-model-store/interface#attachviewmodel)) to current store

### `mountingViews` (*protected*)

A `Set` with [ViewModel](/api/view-models/overview) ids which views are waiting for mount

### `unmountingViews` (*protected*)

A `Set` with [ViewModel](/api/view-models/overview) ids which views are waiting for unmount

### `viewModelsTempHeap` (*protected*)

A `Map` with temp heap vm instances\
Is needed to get access to view model instance before all initializations happens

### `vmConfig` (*protected*)

[ViewModelsConfig](/api/view-models/view-models-config)