ANN: ClojureScript 0.0-2014 - source maps, incremental compilation, and internal changes

[David Nolen]

ClojureScript, the Clojure compiler that emits JavaScript source code.

README and source code: https://github.com/clojure/clojurescript

New release version: 0.0-2014

Leiningen dependency information:

    [org.clojure/clojurescript "0.0-2014"]

There are a number of significant enhancements in this

release. We finally have relative source maps! This should be big

for people integrating ClojureScript with existing web

based workflows.

Under the hood Chas Emerick has improved how the analyzer works making

it thread safe. This make the compiler considerably more robust and

eliminates some race conditions in the browser REPL support.

Incremental compilation is enhanced both with and without source

maps. In particular we now tag ClojureScript compiled JavaScript files

with the version of the compiler used - this should make transitioning

to a new version of the compiler considerably less frustrating - stale

files will get compiled.

For those people using the compiler internals directly you will likely

encounter breakage. If anyone feels inclined to outline a more stable

interface to internals please get involved in leading an incremental

process towards a stable and flexible API for tool builders.

Enhancements:

* relative source map paths, all original sources will be copied to

  :ouput-dir this should make integrating with web workflow much simpler.

* runtime obtainable compiler version number, *clojurescript-version* now

  available at runtime as a string

Bug fixes:

* CLJS-643: make the ClojureScript compiler (more) idempotent

* CLJS-662: CLJS files compiled from JARs get lost from source map

* CLJS-661: (try ... (catch :default e ...) ...)

* CLJS-627: Add warnings on function arity problems

* CLJS-654: Quit repljs on ^D, don't loop on nil

* CLJS-659: tag compiled files with compiler version

* CLJS-642: deftype/record should not emit goog.provide

* CLJS-648: persistent assoc/conj on a transient-created collision node

* CLJS-631: Use ana/namespaces for shadowing vars

* CLJS-641: js* overflow for large inputs

* CLJS-645: parse-ns needs to include 'constants-table as a dep

* CLJS-646: single segment namespaces and reify don't work

* CLJS-521: pass along entire repl environment when loading dependencies

[David Nolen]

Oh, the speed of incremental compilation is now dependent on tools preserving the complier environment information - Chas Emerick should be cutting a release of lein-cljsbuild that does this when ClojureScript 0.0-2014 hits Maven Central.

[Alan Moore]

Just in case it hasn't been mentioned lately... you guys rock!

Thank you *so* much for your hard work on these tools... let me know how I can help.

Alan

[Geraldo Lopes de Souza]

David,

Using relative source maps is not updating .cljs equivalents when the original source is updated. If you delete it'll be created. If you update the .cljs it remains stalled.

Using lein-cljsbuild "1.0.0-alpha2".

Regards,

Geraldo

[David Nolen]

Thanks for the report, fixed in 0.0-2024.

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[Geraldo Lopes de Souza]

Thank you David!