Happy new year! What better way to start the year than with a new Libsass release!

Capitalising on the 3.0 momentum @mgreter and @xzyfer, with help from the Libsass community, have been hard work on this massive release!

Libsass 3.1 brings us closer than ever to Sass feature parity! We've even got a back log of completed features ready to go for the next release!

I'd like to give a shoutout to node-sass team for helping us release and test our RC releases!

Features

• implemented @debug - @mgreter
• implemented @error - @mgreter
• implemented inspect() - @mgreter
• implemented feature-exists() - @xzyfer
• implemented unique-id() - @xzyfer
• implemented random() - @xzyfer
• implemented negative @for loops - @mgreter
• implemented the not operator - @xzyfer
• implemented nth() for maps - @xzyfer
• implemented custom functions and importers - @mgreter
• implemented C API to fetch compiled version - @mgreter
• implemented decrementing in for loops - @mgreter
• improvements to the static value look ahead parser - @xzyfer
• improvements handling of string quotes - @mgreter
• added support for colors rebeccapurple and transparent - @mgreter
• added/improved build scripts for windows - @mgreter
• added AppVeyor for windows CI builds - @mgreter
• added support for converting angle units - @mgreter
• significant speed boost to map-get() - @xzyfer
• better Windows compilation support - @mgreter @am11
• emit @charset "UTF-8" when required - @mgreter
• major updates to the C API - @mgreter

Fixes

• no longer allow concatenating with null - @xzyfer (#698)
• improved handling of colors - @mgreter (#558)
• better support for BEM style selectors - @xzyfer (#738)
• better support for IE properties - @mgreter (#683)
• better support of interoplants in selectors - @xzyfer (#641)
• normalize quotes map keys in keywords() - @xzyfer (#721)
• normalize quotes in str-slice and str-insert - @xzyfer (#763)
• normalize decimal output - @mgreter @xzyfer (#550, #623)
• fixed allowing redefinition of reserved functions - @xzyfer (#713)
• fixed keywords() crashing when no vararg is present - @xzyfer (#672)
• fixed default arguments for function arguments - @mgreter (#708)
• fixed colors and number as map keys - @xzyfer (#652, #534)
• fixed incorrect content type for embedded sourcemaps - @xdissent (#723)
• fixed evaluation of negative variables - @xzyfer (#344)
• fixed @return sometimes not exiting functions - @xzyfer (#736)
• fixed an edge case with str-slice - @xzyfer (#762)
• fixed parsing of assignments with !default and !global flags - @xzyfer (#759)
• fixed !default assignments not overriding null values - @xzyfer (#740)
• fixed allowing maps to be instantiated with duplicate keys - @xzyfer (#628)
• fixed empty css blocks sometimes being outputted - @xzyfer (#659)
• fixed some cases where number comparisons would fail - @xzyfer (#590)
• fixed crashes when multiple semicolons were encountered - @xzyfer (#502)
• fixed a bug with maps and @each with only on variable - @xzyfer (#784)
• fixed a bug with string interpolation in url()s - @mgreter (#644)
• fixed some bugs with the C API - @mgreter (#776)

Documentation

This release saw a big increase in the amount of available documentation thanks to @mgreter and @drewwells!!

Sass spec

Sass spec got a major update bringing it up to date with Sass 3.4 thanks to @hcatlin and @xzyfer.

Know issues

• !global is parsed but the scoping rules aren't respected - (#613)
• nested media queries aren't combined - (#614)
• operations in brackets like (1/2) are sometimes not treated as numbers - (#442, #590)
• still some @extends edge cases - (#316, #317, #592)
• still some sourcemaps issues - (#324)

Huge thanks to everyone that reported bugs, wrote specs and submitted patched. Honourable mentions to @hugogiraudel, @xdissent, @drewwells, @jakob-e, @lunelson, @am11, @hcatlin, @mgreter and @xzyfer for their multiple contributions which made this release possible!