Clojure compiler for SASS, for Lein and Boot, using Libsass Java wrapper
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Latest commit 240c099 Oct 9, 2017


Clojars Project Build Status AppVeyor Downloads Dependencies Status

Clojure wrapper for jsass JNA wrapper for Libsass. This repository also contains Boot and Leiningen tasks.

For parallel Less library check less4clj


  • Jsass features
    • Requires Java 1.8
    • Linux & Windows builds are automatically tested
    • (Doesn't work on Alpine based Docker images)
  • Load imports directly from Java classpath (e.g. Webjars)
    • Add dependency [org.webjars.bower/bootstrap "4.0.0-alpha"] to use Bootstrap
  • Assumes that files starting with _ are partial files and should not be compiled into CSS files.

Boot Clojars Project Downloads

  • Provides the sass task (deraen.boot-sass/sass)
  • For each .sass or .scss file not starting with _ in the fileset creates equivalent .css file.
  • Check boot sass --help for task options.

Leiningen Clojars Project Downloads

  • Provides the sass4clj task
  • For each .sass or .scss file not starting with _ in source-dirs creates equivalent .css file.
  • Check lein help sass4clj for options.

Import load order

Loading order for @import "{name}"; on file at {path}

  1. Local file at {path}/{name}.sass or {path}/{name}.scss
  2. Classpath resource (io/resource "{name}.ext")
  3. Classpath resource (io/resource "{path}/{name}.ext")
  4. Webjar asset
    • Resource META-INF/resources/webjars/{package}/{version}/{path} can be referred using {package}/{path}
    • For example @import "bootstrap/scss/bootstrap.scss"; will import META-INF/resources/webjars/bootstrap/4.0.0-alpha/scss/bootstrap.scss


Log configuration

If you don't have any slf4j implementations you will see a warning:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See for further details.

To disable this add a no operation logger to your project. As this is only required on build phase, you can use :scope "test" so that the dependency is not transitive and is not included in uberjar. Alternatively you can add this dependency to your Leiningen dev profile.

[org.slf4j/slf4j-nop "1.7.13" :scope "test"]


Copyright © 2014-2017 Juho Teperi

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.