import type { BeachballOptions } from '../types/BeachballOptions';
/**
 * Ensure that adequate history is available to check for changes between HEAD and `options.branch`.
 * Otherwise attempting to get changes will fail with an error "no merge base". (This is mostly an
 * issue with CI builds that use shallow clones and may not have a tracking branch configured for
 * the remote target branch.)
 *
 * Since repo may be very large, it's important to avoid fetching the entire history or extra refs.
 * If the repo is shallow and no common commit is found after a normal fetch, this function will
 * iteratively deepen the history (100 commits at a time by default) and check for a common commit
 * each round. If still not found, it will unshallow the clone.
 *
 * Throws an error if history is inadequate and cannot be fixed.
 */
export declare function ensureSharedHistory(options: Pick<BeachballOptions, 'fetch' | 'path' | 'branch' | 'depth' | 'verbose'>): void;
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