export interface UpgradePlan {
    /** Files that exist in old but not in new — should we delete them? */
    removed: string[];
    /** Files that are new in the upstream template. Safe to add. */
    added: string[];
    /** Files where the upstream version differs from what was generated. */
    changed: Array<{
        path: string;
        /** 'clean' = local matches old (safe overwrite); 'conflict' = local diverged. */
        kind: 'clean' | 'conflict';
    }>;
}
/**
 * Compute the upgrade plan without applying anything.
 *
 * @param projectDir — root of the harness install
 * @param newFiles — fingerprint map for the LATEST template render
 */
export declare function planUpgrade(projectDir: string, newFiles: Record<string, string>): Promise<UpgradePlan>;
/**
 * Render a plan as a human-readable summary.
 */
export declare function formatPlan(plan: UpgradePlan): string;
/**
 * Write Git-style inline conflict markers into the local file.
 * Used when planUpgrade reports a 'conflict' entry and the user wants
 * inline markers (the default).
 */
export declare function inlineConflictMarkers(local: string, upstream: string): string;
/**
 * Apply an upgrade plan. Returns the list of paths actually modified.
 * Best-effort — caller should review the plan first via formatPlan().
 */
export declare function applyPlan(projectDir: string, plan: UpgradePlan, newContents: Record<string, string>, opts?: {
    conflictStyle?: 'inline' | 'rej';
}): Promise<string[]>;
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