export interface RenderCacheKeyComposition {
    /** Prefix added by the distributed backend. Defaults to the API render namespace. */
    readonly backendPrefix?: string;
    /** Tenant/source prefix added by the render cache coordinator. */
    readonly cachePrefix?: string;
    /** Whether the coordinator prepends `page:` to non-page overrides. */
    readonly addPagePrefix?: boolean;
    /** Theme suffix added by the context-aware render cache coordinator. */
    readonly colorScheme?: "light" | "dark";
}
export declare function isCanonicalDependencyPinningCacheKey(cacheKey: string): boolean;
/**
 * Return the cache-key suffix for an enabled dependency snapshot.
 *
 * Flag-off and unset callers deliberately receive no suffix so their cache
 * identities remain byte-for-byte compatible with the pre-pinning format.
 */
export declare function buildDependencyPinningCacheVariant(dependencyPinningCacheKey?: string, moduleServerOrigin?: string): string | undefined;
/**
 * Add dependency identity to a render cache override while respecting the
 * complete distributed API key, including prefixes added after this function.
 *
 * Flag-off and invalid snapshot inputs return the legacy override unchanged.
 * Oversized pin-on identities collapse to two domain-separated 64-bit hashes,
 * preserving a deterministic 128-bit identity without truncating either half.
 */
export declare function buildDependencyPinnedRenderCacheKey(legacyRenderCacheKey: string, dependencyPinningCacheKey?: string, moduleServerOrigin?: string, composition?: RenderCacheKeyComposition): string;
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