/**
 * Delta-based context helpers — addresses issue #122.
 *
 * Uses the unified-diff format from the existing `diff` dependency so the
 * resulting deltas are human-readable and round-trippable via applyDelta.
 */
/**
 * Compute a unified-diff delta from `previous` to `current`.
 * Returns the empty string when the inputs are identical (callers can use
 * that to skip transmitting a no-op delta).
 */
export declare function calculateDelta(previous: string, current: string, fileName?: string): string;
/**
 * Apply a unified-diff `delta` to `previous`, returning the reconstructed
 * `current`. Throws if the patch cannot be applied cleanly.
 */
export declare function applyDelta(previous: string, delta: string): string;
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