Koota

Koota ECS

Use Koota for data-oriented Entity Component System architecture with React bindings.

When setting up or undertaking important changes with Koota, fetch the documentations:

https://raw.githubusercontent.com/pmndrs/koota/refs/heads/main/README.md

Technique

Define traits (components) with trait(), create a world, spawn entities with traits, and query entities in systems. Use useQuery to reactively render entities and useTraitEffect to respond to trait changes.

Key Concepts

• trait() defines component schemas with default values
• world.spawn() creates entities with traits
• world.query() finds entities matching traits
• useQuery() hook for reactive entity lists in React
• useTraitEffect() for responding to trait changes without re-rendering
• Systems are React components that use useFrame to update entities (they return null, not views)

Usage

const Position = trait({ x: 0, y: 0 })
const IsCharacter = trait()

const world = createWorld()

// Spawn
world.spawn(Position({ x: 1, y: 2 }), IsCharacter)

// Query in system
world.query(Position).updateEach(([position]) => {
  position.x += 0.01
})

// React component
const characters = useQuery(Position, IsCharacter)

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