import type { ParticleEmitter2D, ParticleEmitterState, ParticleForce, ParticleObject, ParticleObjectsState } from '@flighthq/types/contract';
/** Apply force fields to a typed-array particle emitter, integrating the
 *  resulting acceleration into per-particle velocity. Call this BEFORE
 *  updateParticleEmitter2D each frame so the velocity change is integrated into
 *  position the same frame.
 *
 *  This is a fully opt-in pass: import it only for emitters that need forces.
 *  The core update path is unaware of it. */
export declare function applyParticleForces(emitter: ParticleEmitter2D, state: ParticleEmitterState, forces: ReadonlyArray<ParticleForce>, deltaTime: number): void;
/** Force-field pass for the object-pool path. Call BEFORE updateParticleObjects. */
export declare function applyParticleObjectForces(objects: readonly ParticleObject[], state: ParticleObjectsState, forces: ReadonlyArray<ParticleForce>, deltaTime: number): void;
//# sourceMappingURL=applyParticleForces.d.ts.map