clojurescript lein-cljsbuild ClojureScript dev and production build

Example

Add a :cljsbuild node like the following to your project.clj file.

:cljsbuild {
          :builds {
                   ;;Different target goals should have different names.
                   ;;We have the dev build here
                   :dev {
                        ;;The ClojureScript code should reside in these directories
                         :source-paths ["src-cljs"]
                         :compiler {
                                    ;;This is the target output file
                                    ;;This will include none of the goog code.                                  
                                    :output-to "resources/public/js/main.js"
                                    ;;This stores the compilation files, including goog files.
                                    ;;When using this dev profile, you should add "<script src="/js/goog/base.js>" to your html files.
                                    ;;That will load the goog dependency.
                                    :output-dir "resources/public/js/out"
                                    ;;Having optimizations off is recommended for development
                                    ;;However this means you have to add the goog dependencies yourself (see above)
                                    :optimizations :none
                                    ;;With no optimizations, marking this true, means it adds a source map so you can debug in browser
                                    :source-map true
                                    }
                         }
                   :prod {
                                :source-paths ["src-cljs"]
                                :compiler {
                                           ;;Outputs the javascript file to this path.
                                           :output-to "resources/public/js/main.js"
                                           ;;Advanced optimizations make your code smaller.
                                           ;;They include the goog code in your main file.
                                           ;;No need to add an extra script tag.
                                           :optimizations :advanced
                                           :jar true
                                           }
                                }
                   }
          }

To run these build commands, use lein cljsbuild once. You can specify which profile to use by adding the profile name as the last argument, for example lein cljsbuild once dev to compile with dev parameters.

Using lein cljsbuild auto will cause cljsbuild to automatically update any changed files.