import path from "node:path";
/**
 * Find the number of common ancestor segments between two absolute paths.
 * Returns the count of shared directory segments from the root.
 */
export declare function findCommonAncestorDepth(path1: string, path2: string): number;
/**
 * Normalize a module path to a consistent form.
 * Returns slash-prefixed paths for files within project root,
 * or absolute paths for external files.
 *
 * Examples:
 *   /Users/justin/my-app/src/page.ts      → /src/page.ts
 *   ../shared/utils.ts                    → /Users/justin/shared/utils.ts
 *   /src/page.ts (Vite-style)            → /src/page.ts
 *   node_modules/foo/index.js            → /node_modules/foo/index.js
 *
 * With { absolute: true }:
 *   /Users/justin/my-app/src/page.ts      → /Users/justin/my-app/src/page.ts
 *
 * With { isViteStyle: false }:
 *   /opt/tools/logger.ts                  → /opt/tools/logger.ts (treated as external)
 *   /src/page.tsx                         → /src/page.tsx (treated as external)
 *
 * With { isViteStyle: true }:
 *   /opt/tools/logger.ts                  → /opt/tools/logger.ts (resolved as Vite-style)
 *   /src/page.tsx, { absolute: true }     → /Users/justin/my-app/src/page.tsx
 */
export declare function normalizeModulePath(modulePath: string, projectRootDir: string, options?: {
    absolute?: boolean;
    isViteStyle?: boolean;
}, _path?: typeof path): string;