type ReleaseRenderSlot = () => void;
/** Acquire one process-wide render slot, preserving FIFO queue order. */
export declare function acquireRenderSlot(): Promise<ReleaseRenderSlot>;
/** Bound background fetch/validation and the prepared-buffer handoff to rendering. */
export declare function acquireImagePreparationSlot(): Promise<ReleaseRenderSlot>;
/** Hold one render slot until the complete native image pipeline settles. */
export declare function withRenderSlot<T>(operation: () => Promise<T>): Promise<T>;
/**
 * Prepare background bytes under a separate bound, then atomically hand them
 * to a native render slot. Queued preparation entries retain no image Buffer.
 */
export declare function withPreparedRenderSlot<Prepared, Result>(prepare: () => Promise<Prepared>, render: (prepared: Prepared) => Promise<Result>): Promise<Result>;
/** Internal diagnostics used by deterministic limiter tests. */
export declare function getRenderLimiterStats(): {
    readonly active: number;
    readonly queued: number;
    readonly maxActive: 4;
    readonly maxQueued: 32;
    readonly preparing: number;
    readonly preparationQueued: number;
    readonly maxPreparing: 4;
    readonly maxPreparationQueued: 32;
};
/** Test-only reset. Refuse to orphan active or queued work. */
export declare function resetRenderLimiterForTests(): void;
export {};