import { PathItem32 } from './oas31';
export type PathItemMergeFailure = {
    reason: string;
};
export declare function isPathItemMergeFailure(result: PathItem32 | PathItemMergeFailure): result is PathItemMergeFailure;
/**
 * Combines `incoming` into `existing`, or explains why it will not.
 *
 * Returns a new Path Item; neither argument is modified.
 */
export declare function mergePathItems(existing: PathItem32, incoming: PathItem32): PathItem32 | PathItemMergeFailure;
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