Alexis already pointed out this first resource here, but there is some additional information for you below.
Your best option is to download the EFSHelp.chm tool developed by Divergence Software, Inc. They have a standard windows help version available as well. Visit their file share group, Specialty Scripts and go to the EFS Help File folder.
You can also find the EFS reference information in our EFS Help Center & Library, which also has several guides and a library of EFS formulas.
Keep in mind that these reference materials only cover our EFS extensions. EFS is actually an extended version of JavaScript 1.5. To learn more about core JavaScript functions please visit the following resources.
I don't know why eSignal does not publish and keep upto date comprehensive documentation with each release for those who want to develop their own formulas which should be accessable from within eSignal and as a separte file.
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