code: function isIIFE(node) {
              return node.type === "FunctionExpression" && node.parent && node.parent.type === "CallExpression" && node.parent.callee === node;
          }
docs: Identifies is a node is a FunctionExpression which is part of an IIFE
  @param {ASTNode} node Node to test
  @returns {boolean} True if it's an IIFE