/**
 * @file Progressive Enhancement Context
 * @description Context for progressive enhancement system (Fast Refresh compliant).
 */
/**
 * Feature capability levels
 */
export type CapabilityLevel = 'full' | 'partial' | 'fallback' | 'none';
/**
 * Browser feature capabilities
 */
export interface BrowserCapabilities {
    esModules: boolean;
    asyncAwait: boolean;
    webGL: boolean;
    webGL2: boolean;
    webP: boolean;
    avif: boolean;
    serviceWorker: boolean;
    webWorker: boolean;
    sharedArrayBuffer: boolean;
    intersectionObserver: boolean;
    resizeObserver: boolean;
    cssGrid: boolean;
    containerQueries: boolean;
    cssHas: boolean;
    viewTransitions: boolean;
    navigationAPI: boolean;
    popoverAPI: boolean;
    webAnimations: boolean;
    idleCallback: boolean;
    intl: boolean;
}
/**
 * Feature status
 */
export interface FeatureStatus {
    id: string;
    level: CapabilityLevel;
    loaded: boolean;
    loading: boolean;
    error: Error | null;
    module: unknown;
}
/**
 * Feature definition
 */
export interface FeatureDefinition {
    id: string;
    name: string;
    requires: Array<keyof BrowserCapabilities>;
    enhancedBy?: Array<keyof BrowserCapabilities>;
    loader: () => Promise<unknown>;
    fallbackLoader?: () => Promise<unknown>;
    polyfills?: Array<() => Promise<void>>;
    priority?: number;
}
/**
 * Progressive enhancement context value
 */
export interface ProgressiveEnhancementContextValue {
    capabilities: BrowserCapabilities;
    features: Map<string, FeatureStatus>;
    hasCapability: (capability: keyof BrowserCapabilities) => boolean;
    getFeatureLevel: (featureId: string) => CapabilityLevel;
    loadFeature: (featureId: string) => Promise<unknown>;
    registerFeature: (definition: FeatureDefinition) => void;
}
/**
 * Progressive enhancement context - extracted for Fast Refresh compliance
 */
export declare const ProgressiveEnhancementContext: import('react').Context<ProgressiveEnhancementContextValue | null>;