/**
 * Middleware Chain
 *
 * Runs a chain of middleware functions for stream connections.
 */
import type { StreamMiddleware, StreamMiddlewareContext, StreamMiddlewareResult } from '@plyaz/types/core';
/**
 * MiddlewareChain - Runs middleware in sequence
 *
 * Each middleware can:
 * - Continue to next middleware (return { continue: true })
 * - Stop the chain (return { continue: false, error: ... })
 * - Modify context (return { continue: true, context: { ... } })
 *
 * @example
 * ```typescript
 * const chain = new MiddlewareChain();
 * chain.use(rateLimitMiddleware);
 * chain.use(authMiddleware);
 *
 * const result = await chain.run(context);
 * if (!result.continue) {
 *   return new Response(result.error?.message, { status: 429 });
 * }
 * ```
 */
export declare class MiddlewareChain {
    private readonly logger;
    private readonly middlewares;
    constructor();
    /**
     * Add a middleware to the chain.
     *
     * @param middleware - Middleware function to add
     * @returns this for chaining
     */
    use(middleware: StreamMiddleware): this;
    /**
     * Run all middleware in sequence.
     *
     * @param initialContext - Initial context to pass to first middleware
     * @returns Final result after all middleware have run
     */
    run(initialContext: StreamMiddlewareContext): Promise<StreamMiddlewareResult>;
    /**
     * Get the number of middleware in the chain.
     */
    get length(): number;
    /**
     * Clear all middleware from the chain.
     */
    clear(): void;
}
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