Throwback Async Middleware Composer

Throwback is a lightweight JavaScript/TypeScript library that implements a simple asynchronous middleware pattern, designed to compose promise-returning functions. It is currently in its stable version 4.1.0 and maintains an active release cadence, frequently introducing breaking changes in major versions to refine its API. Key differentiators include its strict focus on a single `ctx` argument for improved TypeScript inference (since v3.0.0), its reliance solely on native Promises (since v2.0.0), and its inspiration from Koa's middleware composition, aiming for a minimalistic yet powerful approach for processing pipelines. It is commonly used in server-side HTTP applications (e.g., Servie) and client-side request libraries (e.g., Popsicle), providing development-time debugging aids that are automatically excluded from production builds.