/**
 * Provider-neutral, exact-snapshot CSS compilation cache.
 *
 * Core captures one explicitly registered CSSProcessor for a complete
 * operation. Compilation and the first stateful build are single-flight and
 * cached only under the exact provider, stylesheet, project, and candidate
 * identities that produced the output.
 *
 * @module html/styles-builder/css-compiler-cache
 */
/** One immutable processor snapshot acquired for a complete CSS operation. */
export interface CSSCompilationSession {
    readonly cacheIdentity: string;
    readonly defaultStylesheet: string;
    build(stylesheet: string, projectSlug: string | undefined, candidates: string[] | Set<string>): Promise<string>;
}
/** Capture the currently registered provider before any cache lookup awaits. */
export declare function acquireCSSCompilationSession(): CSSCompilationSession;
/** Identity of all captured provider-owned inputs that can change emitted CSS. */
export declare function getCSSCompilationCacheIdentity(): string;
/** Compile with an authentic, already captured session. */
export declare function buildCSSWithSession(session: CSSCompilationSession, stylesheet: string, projectSlug: string | undefined, candidates: string[] | Set<string>): Promise<string>;
export declare function invalidateCompiler(): void;
/** Get bounded compilation-cache statistics for monitoring and tests. */
export declare function getCompilerCacheStats(): {
    size: number;
    maxSize: number;
    estimatedSizeBytes: number;
    entries: Array<{
        hash: string;
        createdAt: number;
    }>;
};
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