/**
 * Compute a unified diff between two text strings (Myers diff algorithm).
 * Returns a string in unified diff format compatible with `diff -u`.
 *
 * @param oldText - Original text
 * @param newText - Modified text
 * @param oldLabel - Label for the original file (shown after ---)
 * @param newLabel - Label for the modified file (shown after +++)
 * @param contextLines - Number of context lines around each change (default: 3)
 */
export declare function computeUnifiedDiff(oldText: string, newText: string, oldLabel: string, newLabel: string, contextLines?: number): string;
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