import type { ProviderUsage } from '../../provider.js';
export declare function computeUsedTokens(usage: Partial<ProviderUsage>): number;
export declare function contextWindowTokensUsed(usage: Partial<ProviderUsage>): number;
export type ContextUsageApiBreakdown = {
    input_tokens: number;
    output_tokens: number;
    cache_read_input_tokens: number;
    cache_creation_input_tokens: number;
    context_window_tokens: number;
};
export interface ContextUsageFields {
    totalTokens: number;
    apiUsage: ContextUsageApiBreakdown | null;
}
export declare function buildContextUsageFields(last: ProviderUsage | null | undefined): ContextUsageFields;