/**
 * Reads token usage out of Claude Code's own session transcripts.
 *
 * Layout, confirmed on a real machine rather than from documentation:
 * `~/.claude/projects/<sanitized-cwd>/<sessionId>.jsonl`, where the sanitized
 * cwd is the absolute working-directory path with every `/` replaced by `-`.
 *
 * The load-bearing detail is that top-level session transcripts are a tiny
 * minority of the files. On the machine this was written against, 17,439
 * transcripts totalling 9.7 GB broke down as roughly 103 top-level sessions
 * against 17,116 subagent-task transcripts nested under
 * `<sessionId>/subagents/`. A reader that globbed only `<project>/*.jsonl`
 * would miss essentially all of a subagent-heavy user's real spend, so this
 * one recurses.
 *
 * The files are not homogeneous message streams. A single 14,747-line
 * transcript carried eleven distinct `type` values — `assistant`, `user`,
 * `attachment`, `pr-link`, `last-prompt`, `mode`, `permission-mode`,
 * `queue-operation`, `system`, `file-history-delta`, `file-history-snapshot` —
 * several of which have no `message` key at all. Every one of its 6,028
 * `type: "assistant"` lines carried a `message.usage` object, so that filter is
 * safe, but everything else must be skipped rather than treated as malformed.
 */
import type { LocalUsageReader } from "../types/index.js";
export declare function createClaudeCodeReader(): Promise<LocalUsageReader>;