import { Middleware } from "../types/http.js";
import { AuthContext } from "../types/types.js";
/**
 * Creates an authentication middleware that validates JWT tokens from the `Authorization` header.
 *
 * @param secret - The secret key used to verify the JWT token.
 * @returns A middleware function that authenticates requests and populates the context with user information.
 *
 * @throws {AuthenticationError} If the authorization header is missing, malformed, or the token is invalid.
 *
 * @example
 * app.use(authMiddleware(process.env.JWT_SECRET));
 */
export declare function authMiddleware(secret: string): Middleware<AuthContext>;
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