import type { ChangesetState } from './state.js';
import type { ChangesetAction } from '../action-origin.generated.js';
/**
 * Pure reducer for changeset state. Handles all {@link ChangesetAction}
 * variants.
 *
 * The reducer preserves a stable file order by appending new files via
 * {@link ActionType.ChangesetFileSet} when the id is unknown, and replacing in
 * place when it matches an existing entry. Per-file review lives on
 * {@link ChangesetFile.reviewed} and is toggled (per file, in batches) by the
 * client-dispatchable {@link ActionType.ChangesetFilesReviewChanged}.
 */
export declare function changesetReducer(state: ChangesetState, action: ChangesetAction, log?: (msg: string) => void): ChangesetState;
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