import { CheckpointerTestInitializer } from "../types.js";
import { BaseCheckpointSaver } from "@langchain/langgraph-checkpoint";

//#region src/spec/delta_channel_history.d.ts
/**
 * Conformance tests for {@link BaseCheckpointSaver.getDeltaChannelHistory} — the
 * walk that reconstructs `DeltaChannel` state from `checkpoint_writes`.
 *
 * This is the one checkpointer method with no coverage in the default spec
 * suite, and it is intentionally **opt-in**: it is not run by {@link specTest},
 * so adding it does not raise the conformance bar for third-party savers (the
 * method is Beta and inherits a default implementation from
 * `BaseCheckpointSaver`). Each in-repo saver's `.spec.ts` calls it explicitly so
 * the shared base walk is validated against every backend's real storage —
 * Postgres, SQLite, Redis, MongoDB, and the `MemorySaver` override.
 *
 * The scenarios target the per-backend behaviours the walk depends on:
 * round-tripping `DeltaSnapshot` and plain-array seed blobs, following
 * `parentConfig` up the ancestor chain, and — critically — replaying concurrent
 * same-superstep writes in the canonical (task_id, idx) order regardless of how
 * a given store happens to return `pendingWrites` (insertion order, locale
 * collation, etc.).
 */
declare function deltaChannelHistoryTests<T extends BaseCheckpointSaver>(initializer: CheckpointerTestInitializer<T>): void;
//#endregion
export { deltaChannelHistoryTests };
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