code: function parseTopLevelNodes() {
        var acorn = require('acorn');
        var output = acorn.parse(source, {
          locations: true,
          sourceFile: filePath,
          onComment: onComment
        });
  
        namespaceBoundary();
  
        output.body.forEach(function(node) {
          processTopLevelNode(node);
        });
      }
docs: --- Top Level Nodes ---