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# ApplicationContext class

> Holds runtime state that is shared across all libraries during the game loop.

# ApplicationContext

## Summary

Holds runtime state that is shared across all libraries during the game loop.

## Signature

```typescript theme={null}
declare abstract class ApplicationContext 
```

## Properties

### delta

**Modifiers**: readonly
**Type**:`get delta(): number;`

Elapsed time in milliseconds since the last frame.

### isRunning

**Modifiers**: readonly
**Type**:`get isRunning(): boolean;`

Whether the engine game loop is currently executing.

## Remarks

An instance of this class is available to every library via `BaseContext.application`. Libraries may read `isRunning` and `delta` to make frame-rate-independent decisions.