/**
 * @file csp-generator.browser.ts
 * @description
 *   Browser-compatible version of SecureCSPGenerator.
 *   This version uses native browser APIs and omits Node.js-specific features.
 */
import type { SecureCSPGeneratorOptions } from './types';
/**
 * SecureCSPGenerator:
 * Fetches an HTML page, extracts resource origins,
 * and constructs a robust CSP header string.
 */
export declare class SecureCSPGenerator {
    /** The target URL to analyze. */
    readonly url: URL;
    private readonly opts;
    private readonly logger;
    private html;
    private readonly sources;
    private nonce;
    private detectedInlineScript;
    private detectedInlineStyle;
    private detectedEval;
    /**
     * @param inputUrl - URL of the page to analyze (must be non-empty)
     * @param opts - Configuration options to control fetching and policy
     * @throws Error on invalid URL or insecure scheme when allowHttp=false
     */
    constructor(inputUrl: string, opts?: SecureCSPGeneratorOptions);
    /**
     * Generates a random nonce for use in CSP headers.
     */
    private generateNonce;
    private generateHash;
    /**
     * Downloads HTML via fetch, respecting timeouts and size limits.
     * @throws Error if HTTP status not OK, type mismatch, or size exceeded
     */
    private fetchHtml;
    /**
     * Adds a source to a directive's set, creating the set if needed.
     */
    private ensureSet;
    /**
     * Parses HTML content to extract resource references.
     */
    private parse;
    private cssUrlRe;
    private cssImportRe;
    /**
     * Extracts CSS resource URLs from inline CSS text and adds them.
     */
    private extractCssUrls;
    /**
     * Public entry point: fetches, parses, and constructs the final CSP header.
     * @returns A fully-formed CSP header string.
     */
    generate(): Promise<string>;
}