import type { Vec3 } from '../math';
import * as THREE from 'three/webgpu';
export type FlyToControls = {
    target: THREE.Vector3;
    enabled: boolean;
    update: () => unknown;
};
type FlyToHooks = {
    camera: () => THREE.Camera | undefined;
    controls: () => FlyToControls | undefined;
    duration_ms: () => number;
    invalidate: () => void;
    on_start?: () => void;
    on_change?: () => void;
    on_end?: () => void;
};
export declare const DEFAULT_FLY_TO_DURATION_MS = 400;
export declare const ease_in_out: (progress: number) => number;
export declare function create_fly_to(hooks: FlyToHooks): {
    start: (dir: Vec3) => void;
    step: (delta_seconds: number) => void;
    release: () => void;
    readonly active: boolean;
};
export {};