/**
 * PHASE-2: Social Hearing Mechanics - Hearing Range Engine
 *
 * Calculates how far sound travels based on:
 * - Volume (WHISPER, TALK, SHOUT)
 * - Environment/Biome (urban tavern vs quiet forest)
 * - Atmospheric effects (SILENCE, etc.)
 */
import { BiomeType, Atmospheric } from '../../schema/spatial.js';
export type VolumeLevel = 'WHISPER' | 'TALK' | 'SHOUT';
export interface HearingRangeConfig {
    volume: VolumeLevel;
    biomeContext: BiomeType;
    atmospherics: Atmospheric[];
}
/**
 * Calculate how far sound travels in feet
 *
 * @param config - Volume, biome, and atmospheric conditions
 * @returns Distance in feet that sound can be heard
 */
export declare function calculateHearingRadius(config: HearingRangeConfig): number;
/**
 * Determine if a listener can hear based on distance
 *
 * @param distance - Distance between speaker and listener in feet
 * @param hearingRadius - Maximum hearing range calculated above
 * @returns true if within hearing range
 */
export declare function canHearAtDistance(distance: number, hearingRadius: number): boolean;
/**
 * Calculate distance penalty for adjacent rooms
 *
 * Sound travels through walls/doors, but with degradation:
 * - SHOUT can be heard in adjacent rooms (muffled)
 * - TALK can sometimes be heard (requires good perception)
 * - WHISPER never penetrates walls
 *
 * @param volume - Volume level of speech
 * @returns Distance penalty in feet (added to actual distance)
 */
export declare function getAdjacentRoomPenalty(volume: VolumeLevel): number;
/**
 * Get a description of hearing quality based on distance
 *
 * Used for flavor text in conversation memories
 */
export declare function getHearingQuality(distance: number, hearingRadius: number): string;
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