export type HtmlRewriterElement = {
    prepend(content: string, options?: {
        html?: boolean;
    }): void;
    append(content: string, options?: {
        html?: boolean;
    }): void;
};
export type HtmlRewriterRuntime = {
    on(selector: 'head' | 'body', handler: {
        element: (element: HtmlRewriterElement) => void;
    }): HtmlRewriterRuntime;
    transform(response: Response): Response;
};
export type HtmlRewriterConstructor = new () => HtmlRewriterRuntime;
export type HtmlRewriterMode = 'auto' | 'native' | 'worker-tools' | 'fallback';
export interface HtmlRewriterProvider {
    createHtmlRewriter(): Promise<HtmlRewriterRuntime | null>;
    setMode(mode: HtmlRewriterMode): void;
}
export interface HtmlRewriterLogger {
    warn(message: string): void;
}
export interface DefaultHtmlRewriterProviderOptions {
    mode?: HtmlRewriterMode;
    logger?: HtmlRewriterLogger;
    getNativeHtmlRewriter?: () => HtmlRewriterConstructor | undefined;
    loadWorkerToolsHtmlRewriter?: () => Promise<HtmlRewriterConstructor | null>;
}
export declare class DefaultHtmlRewriterProvider implements HtmlRewriterProvider {
    private htmlRewriterConstructorPromise?;
    private htmlRewriterMode;
    private logger;
    private getNativeHtmlRewriter;
    private loadWorkerToolsHtmlRewriter;
    constructor(options?: DefaultHtmlRewriterProviderOptions);
    setMode(mode: HtmlRewriterMode): void;
    createHtmlRewriter(): Promise<HtmlRewriterRuntime | null>;
    private resolveHtmlRewriterConstructor;
}