events-system

# Events System > Phaser uses the EventEmitter pattern (via eventemitter3) throughout the entire framework. Every major system -- Game, Scene, Input, Loader, Cameras, Sound, Tweens, Physics, Textures, Animations -- is an EventEmitter or contains one. Events use lowercase string keys. Phaser provides named constants for all built-in events to avoid typos and enable IDE autocomplete. **Key source paths:** `src/events/EventEmitter.js`, `src/scene/events/`, `src/core/events/`, `src/input/events/`, `src/loader/events/`, `src/animations/events/`, `src/cameras/2d/events/`, `src/sound/events/`, `src/tweens/events/`, `src/physics/arcade/events/`, `src/textures/events/`, `src/gameobjects/events/`, `src/time/events/` **Related skills:** ../scenes/SKILL.md, ../input-keyboard-mouse-touch/SKILL.md ## Quick Start ```js // on — listen for an event (persists until removed) this.input.on('pointerdown', (pointer) => { console.log('clicked at', pointer.x, pointer.y); }); // once — listen for an event, auto-removes after first fire this.events.once('shutdown', () => { console.log('scene shutting down'); }); // off — remove a specific listener (must pass same function reference) const handler = (pointer) => { /* ... */ }; this.input.on('pointerdown', handler); this.input.off('pointerdown', handler); // emit — fire a custom event with arguments this.events.emit('player-died', this.player, this.score); // removeAllListeners — remove all listeners for an event (or all events) this.eve...