import type { Bundler } from '../../types.js';
/**
 * Detects the bundler engine to use based on config file presence.
 *
 * Detection priority:
 * 1. Explicit `--bundler` flag (passed as `explicitBundler`)
 * 2. Custom config path filename inference (`rspack.*` vs `webpack.*`)
 * 3. Config file discovery (rspack configs checked first)
 * 4. Default: rspack
 */
export declare function detectBundler(rootDir: string, customConfigPath?: string, explicitBundler?: Bundler): Bundler;