export type FocusDirection = "left" | "right" | "up" | "down" | "near" | "far";
export interface FocusCandidate {
    id: number;
    x: number;
    y: number;
    depth: number;
}
export declare function directionalFocusTarget(candidates: readonly FocusCandidate[], currentId: number | undefined, direction: FocusDirection): number | undefined;
export declare function depthPlanePanScale(depth: number, verticalFovRadians: number, viewportHeight: number): number;
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