funcunit/site/node_modules/steal-tools/lib/node/source.js

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var source = module.exports = function(node, sourceProp){
	var activeSource = node.activeSource && node.activeSource.code;
	return sourceProp ? node[sourceProp] : (activeSource || node.normalizedSource || node.minifiedSource || node.transpiledSource || node.load.source);
};

source.node = function(node, sourceProp){
	if(sourceProp) {
		return node[sourceProp];
	}

	return node.activeSource || {
		code: source(node)
	};
};