Redux Common Middleware Collection

redux-middleware is an abandoned JavaScript library (current version 0.1.21, last updated over 7 years ago) that provides a collection of common Redux middleware functions. These middlewares address various concerns such as `metaRouter` for handling meta-actions (delay, identity, API, routing, idle, error), `thunk` for asynchronous actions, `readyStatePromise` for promise-based state updates, `logger` for debugging, and `crashReporter` for error handling. The library was explicitly noted in its README as being in early development and not ready for production use, with a warning that it would be changing rapidly. Given its lack of updates since then, it is effectively abandoned. While it aimed to offer a convenient set of utilities for common Redux patterns, its early and unmaintained state makes it unsuitable for modern applications. Key differentiators at the time of its development included a structured approach to meta-action handling and pre-packaged common utilities.