import type { GeneratedFile } from 'openapi-zod-ts';
import type { ServerConfig } from '../config.js';
/**
 * Emit `_shared/errors.ts`: the single shared module containing the HttpError class.
 * All generated routers (Fastify, Hono, Express) import HttpError from this shared file
 * instead of inlining the class. Emitting once per generation run guarantees that
 * `err instanceof HttpError` works across multiple routers mounted in the same server.
 */
export declare function emitSharedErrorsFile(): GeneratedFile;
/**
 * Derive the absolute path to the shared `_shared/` directory given all project configs.
 *
 * Rules:
 * - If any config has `shared_output` set, that value (resolved against cwd) wins.
 *   The first non-empty `shared_output` across all configs is used.
 * - Single project: commonParent = resolvedOutput (the output dir itself),
 *   so shared = `<output>/_shared`.
 * - Multiple projects: commonParent = longest common directory prefix of all resolved
 *   output paths, so shared = `<commonParent>/_shared`.
 */
export declare function deriveSharedDir(cwd: string, configs: ServerConfig[]): string;
/**
 * Compute the relative import path from a project's output directory to
 * the `_shared/errors.js` module in the shared directory.
 *
 * Result always ends in `/_shared/errors.js` relative to the outputDir.
 * It is normalized to use forward slashes and always starts with `./` or `../`.
 */
export declare function sharedErrorsImportPath(outputDir: string, sharedDir: string): string;
/**
 * Find the longest common directory prefix of a list of absolute paths.
 * Each segment must match exactly; the first differing segment ends the prefix.
 *
 * Examples:
 *   ['/gen/public', '/gen/admin']  → '/gen'
 *   ['/a/b/c', '/a/b/d']          → '/a/b'
 *   ['/a/x', '/b/y']              → '/'
 */
export declare function findCommonParent(paths: string[]): string;
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