import * as THREE from 'three';
export declare function lerp(a: number, b: number, t: number): number;
/**
 * Creates a unique key for a pair of entity IDs.
 * This can be used to deduplicate interactions between two entities.
 * @param eid1
 * @param eid2
 * @returns
 */
export declare function makePairKey(eid1: number, eid2: number): bigint;
export declare function clamp(value: number, min: number, max: number): number;
export declare function timeToSunDirection(time: number): THREE.Vector3;
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