import { ProviderUsage } from '../base/ProviderUsage';
import type { UsagePayload } from '../base/types';
/**
 * Copilot SDK events carry `outputTokens` on assistant.message and sometimes
 * a telemetry block with input/context occupancy. Guard every field.
 */
export declare function extractCopilotUsage(raw: unknown, model?: string | null): UsagePayload | null;
export declare class CopilotProviderUsage extends ProviderUsage {
    readonly family = "copilot";
    readonly defaultContextLimit = 128000;
    extract(raw: unknown, model?: string | null): UsagePayload | null;
}