/**
 * Changelog diffing for build ingestion.
 *
 * Compares an incoming `BuildConfig` against the previously stored build to
 * produce a `StoredChangeLog`. Delegates to the existing section-level diff
 * functions in `change-logs/diff.ts` so diffing logic is never duplicated.
 */
import type { Db } from "mongodb";
import type { BuildConfig } from "../types/build-type.js";
import type { StoredBuildMeta, StoredChangeLog } from "./schemas.js";
/**
 * Produces a `StoredChangeLog` by diffing `config` against the existing build
 * identified by `existingMeta`.
 *
 * Returns `null` on first ingestion (no previous build to diff against).
 */
export declare function diffChangelog(db: Db, config: BuildConfig, existingMeta: StoredBuildMeta | null): Promise<StoredChangeLog | null>;
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