/**
 * Support for legacy browsers with polyfills and fallbacks
 */
export interface LegacySupport {
    hasES6: boolean;
    hasPromise: boolean;
    hasFetch: boolean;
    hasCSS: boolean;
    needsPolyfills: string[];
}
export declare class LegacySupportManager {
    private support;
    constructor();
    private detectLegacySupport;
    getSupport(): LegacySupport;
    isLegacyBrowser(): boolean;
    /**
     * Applies CSS fallbacks for legacy browsers
     */
    generateLegacyCSS(modernCSS: Record<string, string>): Record<string, string>;
    /**
     * Injects CSS for legacy browser support
     */
    injectLegacySupport(): void;
}
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