/**
 * Whether the project has an `app` directory and no page files outside `pages/api`.
 *
 * A false positive would silently drop Pages Router navigation spans, so any file outside `pages/api` counts as a
 * page (covers custom `pageExtensions` and `_app`/`_document`), and no `app` directory means `false`.
 */
export declare function hasOnlyAppRouterPages(projectDir: string): boolean;
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