(-> (doto (js/Set.) (.add 1) (.add 2))
seq)24 April 2020
ClojureScript Team
We’re happy to announce a new release of ClojureScript. If you’re an existing user of ClojureScript please read over the following release notes carefully, there are two very significant changes. First, ClojureScript now ships with greatly enhanced support for integration with popular JavaScript bundling tools such as Webpack and Metro. Second, due to continuing changes to Google Closure Compiler and Library, we’ve decided to drop support for the Rhino and Nashorn REPLs to lower the maintenance burden around releases.
Closure Compiler has been updated to v20200112
Closure Library has been updated to 0.0-20191016-6ae1f72f
Rhino, Nashorn, and GraalJS REPLs have been removed
The latest Closure Compiler & Library releases included a number of breaking changes which significantly increased the maintenance burden for this release. Given Closure Compiler & Library’s recent pace of change, we’ve decided to focus our energies on the essential browser and Node.js REPLs. We’ve also begun enrichening the CLI & REPL APIs to ease third party efforts to target these JavaScript environments.
:target :bundle
:bundle-cmd
:target-fn
A new --install-deps CLI option
We’re happy to announce a significant new feature - the :bundle target. This
target generates output that can be fed directly into popular JavaScript
bundlers such as Webpack and Metro (for React Native). Not only does this
greatly ease usage of Node modules, library creators can now distribute
ClojureScript artifacts that depend on Node modules and be confident that users
can consume these artifacts regardless of which build tool they may prefer.
There’s much more to say about the :bundle target, and we’ll be releasing a
separate post and guide soon.
It is now possible to call seq on any object implementing JavaScript’s
Iterator protocol. A new core predicate, cljs.core/js-iterable?
is introduced with this feature.
For example, (js-iterable? (js/Set.)) is true and
(-> (doto (js/Set.) (.add 1) (.add 2))
seq)can now produce (1 2).
Single arity arithmetic operations will now warn on bad arguments:
cljs.user=> (+ "foo") WARNING: cljs.core/+, all arguments must be numbers, got [string] instead at line 1 <cljs repl>
re-pattern, re-matches, and re-find are now faster
Code gen better facilitates protocol static dispatch inlining
Fast initial prompt for browser REPL
Output size minimized for trivial "Hello World" programs
For a complete list of updates in ClojureScript 1.10.741 see Changes.