export declare class MainBranchError extends Error {
    readonly repoPath: string;
    readonly cause?: unknown | undefined;
    constructor(message: string, repoPath: string, cause?: unknown | undefined);
}
export type MainBranchOutcome = {
    readonly status: 'exists-local';
    readonly mainBranch: string;
} | {
    readonly status: 'fetched-from-origin';
    readonly mainBranch: string;
} | {
    readonly status: 'created-from-head';
    readonly mainBranch: string;
    readonly from: string;
    readonly commit: string;
    readonly pushed: boolean;
};
export interface EnsureMainBranchOptions {
    readonly repoPath: string;
    readonly mainBranch: string;
    /** When true (default), push newly-created branches to origin. */
    readonly push?: boolean;
}
export declare function ensureMainBranch(options: EnsureMainBranchOptions): Promise<MainBranchOutcome>;
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