export interface ConfigChange {
    type: 'changed' | 'added' | 'removed';
    lineNumber: number;
    oldLine?: string;
    newLine?: string;
}
export interface ConfigDiff {
    hasChanges: boolean;
    changes: ConfigChange[];
    summary: string;
}
/**
 * Line-based diff between two config file contents.
 * Compares prod (source) against test (target) line by line.
 * - 'added' = line exists in prod but not test
 * - 'removed' = line exists in test but not prod
 * - 'changed' = line differs between prod and test
 */
export declare function diffConfigFiles(prodContent: string, testContent: string): ConfigDiff;
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