/**
 * Simple unified diff generator for Edit tool's old_string / new_string.
 *
 * Produces a minimal diff showing removed (-) and added (+) lines.
 */
/**
 * Generate a unified-style diff string from old and new content.
 * Returns empty string if the strings are identical.
 */
export declare function generateDiff(oldString: string, newString: string): string;
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