import type { ParticleEmitterSignals } from '@flighthq/types/contract';
/** Create a fresh {@link ParticleEmitterSignals} group. Called by
 *  {@link enableParticleEmitterSignals} on first use; exported for unit testing. */
export declare function createParticleEmitterSignals(): ParticleEmitterSignals;
/** Opt-in signals for a typed-array particle emitter.
 *
 *  Returns the {@link ParticleEmitterSignals} group attached to `state`, creating it on
 *  first call. The cost of signals is zero until this function is called — keeping it
 *  opt-in honors the `enable*` convention and avoids allocation for emitters that do not
 *  need loose multi-listener notification.
 *
 *  Connect to the returned signals; they are fired by the simulation functions
 *  (`updateParticleEmitter2D`, `stepParticleEmitter2D`) when the state carries signals.
 *  Use `getParticleEmitterSignals` to read without creating. */
export declare function enableParticleEmitterSignals(state: object): ParticleEmitterSignals;
/** Return the {@link ParticleEmitterSignals} attached to `state`, or `null` if signals
 *  have not been enabled for this emitter. */
export declare function getParticleEmitterSignals(state: object): ParticleEmitterSignals | null;
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