MSBuild Script to Compress All JavaScript Files in a Project

I’ve got one project in my solution which has a lot of JavaScript files and they keep on coming. We’ve been using the YUI Compressor for quite a while and it’s proven an effective tool. After a lot of time of fiddling with the project’s MSBuild script, I came up with the following:
<Target Name="BeforeBuild">
  <MakeDir
Directories="compressed\%(Content.RelativeDir)"
Condition="(%(Content.Extension) == '.js') And (!(Exists('compressed\%(Content.RelativeDir)')))" /> <Exec
Command="java -jar yuicompressor-x.y.z.jar --type js -o compressed\%(Content.Identity) %(Content.Identity)"
Condition="%(Content.Extension) == '.js'" /> <CreateItem
Include="compressed\%(Content.Identity)"
Condition="%(Content.Extension) == '.js'" /> </Target>

The above takes all of the JavaScript files in your project, compresses them (in the same relative directories) into the compressed directory and then adds them to the project, in case it gets deployed anywhere.

Note that I’m using the Extension, Identity and RelativeDir well-known item metadata attributes in order to impose batching, since batches causes loops instead of the string concatenation that happens when you reference the items themselves.

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