import type { CacheHint, CacheOptions, CacheProvider, InvalidateOptions, LiveDataEntry } from '../types.js';
export interface CacheLike {
    /**
     * Whether caching is enabled. `false` when no cache provider is configured
     * or in dev mode. Libraries can check this before calling cache methods.
     */
    readonly enabled: boolean;
    /**
     * Set cache options for the current request. Call multiple times to merge options.
     * Pass `false` to explicitly opt out of caching.
     */
    set(input: CacheOptions | CacheHint | LiveDataEntry | false): void;
    /** All accumulated cache tags for this request. */
    readonly tags: string[];
    /** A read-only snapshot of the current cache options, including accumulated tags. */
    readonly options: Readonly<CacheOptions>;
    /**
     * Purge cached entries by tag or path. Requires a cache provider to be configured.
     */
    invalidate(input: InvalidateOptions | LiveDataEntry): Promise<void>;
}
export declare class AstroCache implements CacheLike {
    #private;
    readonly enabled = true;
    constructor(provider: CacheProvider | null);
    set(input: CacheOptions | CacheHint | LiveDataEntry | false): void;
    get tags(): string[];
    /**
     * Get the current cache options (read-only snapshot).
     * Includes all accumulated options: maxAge, swr, tags, etag, lastModified.
     */
    get options(): Readonly<CacheOptions>;
    invalidate(input: InvalidateOptions | LiveDataEntry): Promise<void>;
}
/**
 * Apply cache headers to a response.
 */
export declare function applyCacheHeaders(cache: CacheLike, response: Response): void;
/**
 * Check whether the cache has any active state worth acting on.
 */
export declare function isCacheActive(cache: CacheLike): boolean;