/**
 * Reads token usage out of Qwen Code's own session transcripts.
 *
 * Layout, confirmed on a real machine: `~/.qwen/projects/<sanitized-cwd>/chats/
 * <sessionId>.jsonl`, where the sanitized cwd is the absolute working-directory
 * path with every `/` replaced by `-` — the same convention Claude Code uses
 * for its own `~/.claude/projects` layout, which is unsurprising since Qwen
 * Code's chat-recording model traces back to the same lineage as Gemini CLI's.
 * `~/.qwen/projects/<slug>/` also holds a sibling `memory/` directory with a
 * `MEMORY.md` file and no JSONL, so the walk below is scoped to `chats/`
 * specifically rather than the whole project directory.
 *
 * The bundled CLI (`@qwen-code/qwen-code`, installed copy inspected directly)
 * references `parentSessionId` the same way Gemini CLI's engine does for
 * subagent transcripts, so this reader recurses under each project's `chats/`
 * directory at any depth rather than globbing one level — the same lesson
 * `claudeCodeReader.ts` already paid for.
 *
 * Each line is a flat record with `type`, `uuid`, and (for `type: "assistant"`)
 * a `model` and `usageMetadata` object shaped like Google's GenAI
 * `usageMetadata`: `promptTokenCount`, `candidatesTokenCount`,
 * `thoughtsTokenCount`, `totalTokenCount`, `cachedContentTokenCount`. On a real
 * machine, `totalTokenCount` equalled `promptTokenCount + candidatesTokenCount
 * + thoughtsTokenCount` exactly across all 21 real assistant records sampled —
 * so `thoughtsTokenCount` is additive into output, not a separate bucket.
 *
 * `cachedContentTokenCount` is a SUBSET of `promptTokenCount`, not disjoint —
 * confirmed by reading the installed CLI's own converters rather than
 * inferring from samples, because every real sample on this machine had zero
 * cache tokens. `buildAnthropicUsageMetadata` in
 * `chunks/anthropicContentGenerator-*.js` and the OpenAI-compatible converter
 * in `chunks/chunk-*.js` both derive `cachedContentTokenCount` from the
 * upstream response's own cache-read field and leave `promptTokenCount` as the
 * upstream's full prompt count — the cached portion is never added on top. So
 * `inputTokens` here is `prompt - cached`, matching the convention this
 * subsystem's `LocalUsageTotals` type expects (`inputTokens` +
 * `cacheReadTokens` must sum to the true prompt size without double-counting),
 * the same subtraction `codexReader.ts` does for the same reason.
 *
 * Cost is deliberately `unavailable`. Two independent reasons, either one
 * sufficient on its own: (1) no provider identifier is logged alongside the
 * model name, and Qwen Code is pluggable to arbitrary OpenAI- or
 * Anthropic-compatible backends — on the machine this was written against, the
 * model names logged were `claude-sonnet-4-5` and `claude-haiku-4-5`, i.e. this
 * particular install was routed through a custom/litellm endpoint rather than
 * Alibaba's own Qwen models, so even the model name does not reliably identify
 * a vendor to price against; (2) Qwen Code's own hosted models are commonly
 * used via a subscription/OAuth flow rather than metered API keys, the same
 * situation that keeps Codex's confidence `unavailable`.
 */
import type { LocalUsageReader } from "../types/index.js";
export declare function createQwenCodeReader(): Promise<LocalUsageReader>;