/**
 * UIQuality -- maps buffer occupancy + device capability to UI complexity tier.
 *
 * Same pattern as video ABR (Adaptive Bitrate). Composite signal from
 * buffer occupancy and device tier determines rendering fidelity.
 *
 * @module
 */
import type { MotionTier as _MotionTier } from '@czap/_spine';
import { Boundary } from './boundary.js';
/**
 * Motion tier — re-anchored from `@czap/_spine` (the canonical declaration
 * per ADR-0010). The ladder runs from lowest capability (`none`, forced by
 * `prefers-reduced-motion: reduce` regardless of GPU tier) to highest
 * (`compute`, which unlocks the Rust/WASM kernels).
 */
export type MotionTier = _MotionTier;
/**
 * Coarse UI-complexity ladder, in increasing fidelity: `skeleton` (placeholder
 * blocks only) up through `rich` (full interactive styled content).
 */
export type UIQualityTier = 'skeleton' | 'text-only' | 'styled' | 'interactive' | 'rich';
/** {@link Boundary.Shape} instantiation used by {@link UIQuality} — input = `buffer-occupancy`, states = the {@link UIQualityTier} ladder. */
export type UIQualityBoundary = Boundary.Shape<'buffer-occupancy', readonly ['skeleton', 'text-only', 'styled', 'interactive', 'rich']>;
interface UIQualityEvaluatorShape {
    evaluate(bufferOccupancy: number, deviceTier?: MotionTier): UIQualityTier;
    readonly boundary: UIQualityBoundary;
}
declare function _make(): UIQualityEvaluatorShape;
/**
 * UIQuality — adaptive-bitrate-style UI fidelity gate.
 *
 * Combines buffer occupancy (how far ahead the generator is) and device
 * {@link MotionTier} into a composite score and maps it via {@link Boundary}
 * with hysteresis to a {@link UIQualityTier}.
 */
export declare const UIQuality: {
    /** Build a stateful evaluator that remembers the previous tier for hysteresis. */
    make: typeof _make;
    /** The pre-built boundary — exposed so callers can compile it to CSS/GLSL directly. */
    boundary: UIQualityBoundary;
};
export declare namespace UIQuality {
    /** Structural shape of a UIQuality evaluator. */
    type Shape = UIQualityEvaluatorShape;
    /** Alias for {@link UIQualityTier}. */
    type Tier = UIQualityTier;
}
export {};
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