/**
 * Convert a spec file's relative path to its base route slug, applying the same
 * l10n transform the route builder uses (`@l10n/de/foo.yaml` -> `/de/foo`).
 *
 * Index files map to their directory URL (`foo/index.yaml` -> `/foo`). The
 * index decision reuses `parseBaseName` — the exact primitive the core route
 * slugifier uses (`isIndexFile` in server/plugins/lifecycle.ts) — so it can't
 * drift from the core / openapi-docs. Without it, an API mounted at
 * `output: foo/index.yaml` would land at `/foo/index` and break links/sidebar
 * entries that reference it by its `index.yaml` output path.
 *
 * NOTE: this transform does NOT apply the content-slugs normalizations
 * (versioned `@x.y` folders, custom slugs) — route building derives slugs
 * through `createSlugify` instead. It is used by the loader-time mock-server
 * URL (`options.ts`) and by `rebaseAutoMockServerUrl` (`index.ts`), which
 * reconstructs the same value to detect the auto-generated URL and rebase it
 * onto the normalized route slug.
 */
export declare function relativePathToBaseSlug(relativePath: string): string;
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