/**
 * Myers diff with unified-format output. No external dependencies.
 * Operates on arrays of lines (newline-terminated or stripped).
 */
export interface UnifiedDiffOptions {
    context?: number | undefined;
    fromFile?: string | undefined;
    toFile?: string | undefined;
}
export declare function unifiedDiff(oldText: string, newText: string, opts?: UnifiedDiffOptions): string;
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