import { type ContentsFlag } from '../bsp/contents.js';
import type { Vec3 } from '../math/vec3.js';
import { type PmFlags, PmType, WaterLevel } from './constants.js';
import type { PmoveTraceResult } from './types.js';
import { type PlayerDimensions } from './dimensions.js';
export interface DuckTraceParams {
    readonly start: Vec3;
    readonly end: Vec3;
    readonly mins: Vec3;
    readonly maxs: Vec3;
    readonly mask: ContentsFlag;
}
export type DuckTraceFn = (params: DuckTraceParams) => PmoveTraceResult;
export interface CheckDuckParams {
    readonly pmType: PmType;
    readonly pmFlags: PmFlags;
    readonly buttons: number;
    readonly waterlevel: WaterLevel;
    readonly hasGroundEntity: boolean;
    readonly onLadder: boolean;
    readonly n64Physics: boolean;
    readonly origin: Vec3;
    readonly mins: Vec3;
    readonly maxs: Vec3;
    readonly trace: DuckTraceFn;
}
export interface CheckDuckResult extends PlayerDimensions {
    readonly pmFlags: PmFlags;
    readonly ducked: boolean;
    readonly changed: boolean;
}
/**
 * Pure port of PM_CheckDuck from rerelease `p_move.cpp`. Updates the PMF_DUCKED flag
 * based on crouch input, obstruction traces, and special cases (dead bodies) without
 * mutating the provided mins/maxs. Returns the updated flag word plus the dimensions
 * computed from PM_SetDimensions so callers can update collision bounds atomically.
 */
export declare function checkDuckState(params: CheckDuckParams): CheckDuckResult;
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