import { type CostExplorerClient } from "@aws-sdk/client-cost-explorer";
import { type Result } from "@fjall/generator";
export interface CostAllocationTag {
    TagKey: string;
}
/**
 * Activate cost allocation tags for billing tracking.
 * Idempotent — activating already-active tags is a no-op.
 *
 * Returns success with no action if the tags array is empty.
 */
export declare function activateCostAllocationTags(client: CostExplorerClient, tags: CostAllocationTag[], abortSignal?: AbortSignal): Promise<Result<void>>;