/**
 * Aggregated token usage parsed from a Claude CLI stream-json log file.
 * All fields are null when no usage data is available (e.g. copilot backend).
 */
export interface TokenUsage {
    inputTokens: number | null;
    outputTokens: number | null;
    cacheCreationInputTokens: number | null;
    cacheReadInputTokens: number | null;
}
/**
 * Parses token usage totals from Claude CLI stream-json log content.
 *
 * Each line of the log is a JSON object. Lines with `type === "assistant"` carry
 * a `message.usage` object with snake_case token counts. Multiple lines may share
 * the same top-level `uuid` (streaming chunks of the same message) — we deduplicate
 * by uuid, keeping the last occurrence, then sum across unique messages.
 *
 * For the `copilot` backend, no structured token data is available, so all-null
 * values are returned immediately.
 *
 * @param logContent - Raw string content of the log file (newline-separated JSON)
 * @param backend - The backend that produced the log ('claude' | 'copilot')
 * @returns Aggregated token counts, or all-null if unavailable
 */
export declare function parseTokenUsageFromLog(logContent: string, backend: string): TokenUsage;
/**
 * Convenience wrapper that reads a log file from disk and calls `parseTokenUsageFromLog`.
 *
 * Returns all-null TokenUsage if the file does not exist or cannot be read.
 *
 * @param logFilePath - Absolute path to the Claude CLI log file
 * @param backend - The backend that produced the log ('claude' | 'copilot')
 * @returns Aggregated token counts, or all-null if unavailable
 */
export declare function parseTokenUsageFromFile(logFilePath: string, backend: string): TokenUsage;
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