import type { ParticleEmitterState, RandomSource } from '@flighthq/types/contract';
export declare const PARTICLE_VELOCITY_STRIDE = 3;
export declare function createParticleEmitterState(random?: RandomSource): ParticleEmitterState;
/** Grow the per-particle state arrays to hold at least `capacity` particles.
 *  No-op when already large enough. `colorBirth`/`colorDeath` are only grown when
 *  the emitter uses color variance (they stay empty otherwise). */
export declare function ensureParticleEmitterStateCapacity(state: ParticleEmitterState, capacity: number, hasColorVariance: boolean): void;
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