/**
 * Format detection utilities for module loaders
 */
import type { ModuleFormat, ModuleFormatDetector } from "../types";
/**
 * Default format detector based on URL patterns and environment capabilities
 */
export declare class DefaultFormatDetector implements ModuleFormatDetector {
    /**
     * Detect module format from URL or content analysis
     */
    detectFormat(urlOrContent: string): Promise<ModuleFormat | null>;
    /**
     * Detect format from URL patterns
     */
    private detectFromUrl;
    /**
     * Detect optimal format based on environment capabilities
     */
    private detectFromEnvironment;
    /**
     * Check if a specific format is supported in the current environment
     */
    isFormatSupported(format: ModuleFormat): boolean;
    /**
     * Get optimal format from a list of available formats
     */
    getOptimalFormat(availableFormats: ModuleFormat[]): ModuleFormat;
    /**
     * Check if ESM is supported in the current environment
     */
    private supportsESM;
}
/**
 * Content-based format detector that analyzes module content
 */
export declare class ContentBasedFormatDetector implements ModuleFormatDetector {
    /**
     * Detect format by analyzing the actual module content
     */
    detectFormat(content: string): Promise<ModuleFormat | null>;
    /**
     * Check if format is supported
     */
    isFormatSupported(format: ModuleFormat): boolean;
    /**
     * Get optimal format from available formats
     */
    getOptimalFormat(availableFormats: ModuleFormat[]): ModuleFormat;
    /**
     * Detect ESM patterns in content
     */
    private hasESMPatterns;
    /**
     * Detect UMD patterns in content
     */
    private hasUMDPatterns;
    /**
     * Detect CommonJS patterns in content
     */
    private hasCJSPatterns;
    /**
     * Detect AMD patterns in content
     */
    private hasAMDPatterns;
    /**
     * Detect IIFE patterns in content
     */
    private hasIIFEPatterns;
}
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