/**
 * Token usage collection from AI tool session files.
 *
 * Currently supports: Claude Code
 * Data source: ~/.claude/projects/{project-hash}/{session}.jsonl
 */
export interface TokenUsage {
    inputTokens: number;
    outputTokens: number;
    cacheCreationTokens: number;
    cacheReadTokens: number;
    totalTokens: number;
}
/**
 * Collect token usage from Claude Code for the current project.
 *
 * @param projectRoot - Project root directory
 * @param sinceTimestamp - Only count tokens after this ISO timestamp
 * @returns Token usage, or null if Claude Code data not found
 */
export declare function collectClaudeTokens(projectRoot: string, sinceTimestamp?: string): TokenUsage | null;
/**
 * Collect token usage between two timestamps (for a specific task).
 */
export declare function collectClaudeTokensBetween(projectRoot: string, startTime: string, endTime: string): TokenUsage | null;
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