/**
 * Content-addressed CSS cache with provider-identified JIT inputs.
 *
 * CSS payloads are keyed by their full SHA-256 identity. Regeneration inputs
 * live in the same versioned entry and are usable only by the exact captured
 * CSS pipeline identity that created them; the former split legacy-input
 * fallback is intentionally unsupported.
 *
 * @module html/styles-builder/css-hash-cache
 */
export interface CSSCacheEntry {
    readonly css: string;
    readonly candidates: readonly string[];
    readonly stylesheet: string;
    readonly pipelineIdentity?: string;
}
export interface CSSRegenerationInputs {
    readonly candidates: string[];
    readonly stylesheet: string;
    readonly pipelineIdentity: string;
}
/** Store CSS and, when supplied, the exact inputs needed for JIT regeneration. */
export declare function cacheCSSAsync(css: string, hash?: string, inputs?: {
    candidates: string[] | Set<string>;
    stylesheet: string;
    pipelineIdentity: string;
}): Promise<string>;
export declare function getCSSByHash(hash: string): string | undefined;
export declare function getCSSByHashAsync(hash: string): Promise<string | undefined>;
export declare function clearCSSCache(): void;
/** Resolve JIT inputs only when they match the currently captured pipeline. */
export declare function resolveRegenerationInputs(expectedHash: string, pipelineIdentity: string): Promise<CSSRegenerationInputs | undefined>;
/** Persist a verified regenerated entry under its immutable content identity. */
export declare function persistRegeneratedCSSEntry(hash: string, entry: CSSCacheEntry): Promise<void>;
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