Any plans for cljs support? On Monday, 23 May 2016 07:12:29 UTC-7, Rich Hickey wrote: > > Introducing clojure.spec > > I'm happy to introduce today clojure.spec, a new core library and support > for data and function specifications in Clojure. > > Better communication > > Clojure is a dynamic language, and thus far we have relied on > documentation or external libraries to explain the use and behavior of > functions and libraries. But documentation is difficult to produce, is > frequently not maintained, cannot be automatically checked and varies > greatly in quality. Specs are expressive and precise. Including spec in > Clojure creates a lingua franca with which we can state how our programs > work and how to use them. > > More leverage and power > > A key advantage of specifications over documentation is the leverage they > provide. In particular, specs can be utilized by programs in ways that docs > cannot. Defining specs takes effort, and spec aims to maximize the return > you get from making that effort. spec gives you tools for leveraging specs > in documentation, validation, error reporting, destructuring, > instrumentation, test-data generation and generative testing. > > Improved developer experience > > Error messages from macros are a perennial challenge for new (and > experienced) users of Clojure. specs can be used to conform data in macros > instead of using a custom parser. And Clojure's macro expansion will > automatically use specs, when present, to explain errors to users. This > should result in a greatly improved experience for users when errors occur. > > More robust software > > Clojure has always been about simplifying the development of robust > software. In all languages, dynamic or not, tests are essential to quality > - too many critical properties are not captured by common type systems. > spec has been designed from the ground up to directly support generative > testing via test.check https://github.com/clojure/test.check. When you > use spec you get generative tests for free. > > Taken together, I think the features of spec demonstrate the ongoing > advantages of a powerful dynamic language like Clojure for building robust > software - superior expressivity, instrumentation-enhanced REPL-driven > development, sophisticated testing and more flexible systems. I encourage > you to read the spec rationale and overview http://clojure.org/about/spec. > Look for spec's inclusion in the next alpha release of Clojure, within a > day or so. > > Note that spec is still alpha, and some details are likely to change. > Feedback welcome. > > I hope you find spec useful and powerful! > > Rich > >
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