The downside is, when you compile, you do not get errors if the Flash IDE didn’t find a class for a particular Symbol that’s set to have one.  Maybe you mis-typed the package path or class name.  Maybe you forgot to set the class path for the FLA.  Maybe the FLA is in the wrong place.  Whatever the reason, your code “won’t work” and you won’t know why.  You may not get code hints in Flash Builder / FDT / IntelliJ, and certain other dependencies may be missing as well and you’ll be left wondering why.

The Flash IDE provides a check mark button next to the linkage class to allow you to confirm or deny Flash can find the class.  In a quick scan of the JavaScript for Flash docs, I could not find a way to use this button’s functionality in JSFL.  So, I wrote a quick script that does.

NOTE: I do not take source paths into account; I assume that the classes are in the same directory as the FLA’s.  You can easily change this by querying fl.getDocumentDOM().sourcePath, or just hardcoding your known path.

fl.outputPanel.clear();
fl.trace("*** Checking for un-found classes... ***");
var totalNotFound = 0;

var doc = fl.getDocumentDOM();
var lib = doc.library;
var items = lib.items;

var itemsLen = items.length;

for(var i = 0; i < itemsLen; i++)
{

	var item = items[i];
	/*
	fl.trace("--------------");
	for(var prop in item)
	{
		fl.trace(prop + "::" + item[prop]);
	}
	*/

	if(item.linkageExportForAS)
	{
		var className = item.linkageClassName;
		var classPath = className.split(".").join("/");
		var exists = doesClassExistOnDisk(classPath);
		if(exists == false)
		{
			totalNotFound++;
			fl.trace("Couldn't find class for '" + item.name + "', class: " + className);
		}
	}

}

if(totalNotFound == 0)
{
	fl.trace("*** DONE. All classes found.");
}
else
{
	fl.trace("*** DONE. " + totalNotFound + " classes not found.");
}

function doesClassExistOnDisk(classPath)
{
	var filename = classPath + ".as";
	var doc = fl.getDocumentDOM();
	var currentFolder = doc.pathURI.split(doc.name).join("");
	var fullURI = currentFolder + filename;
	//fl.trace("fullURI: " + fullURI);
	return FLfile.exists(fullURI);
}

On a side note, Dru Kepple has a lot of wonderful JSFL classes to help working with ActionScript in the Flash IDE, specifically the Document class.