Function conditionalSystem

conditionalSystem<T extends BaseEntity>(
predicate: () => boolean,
system: SystemFn<T>,
): SystemFn<T>
Creates a conditional system that only runs when a predicate is true.

Enables dynamic system control based on game state. More flexible than manual enable/disable as the condition is evaluated every frame.
Type Parameters
- T extends BaseEntity
Parameters
- predicate: () => boolean
  Function that returns whether to run the system
- system: SystemFn<T>
  The system function to conditionally run
Returns SystemFn<T>
A system that only executes when predicate returns true
Example
```
// Only run movement when game is not paused
const gameState = { isPaused: false };
const pausableMovement = conditionalSystem(
  () => !gameState.isPaused,
  movementSystem
);
```
Example
```
// Run AI only when there are enemies
const aiSystem = conditionalSystem(
  () => countEntities(world, 'enemy') > 0,
  enemyAI
);
```
- Defined in src/core/ecs/systems.ts:344