jscodeshift codemod for function names in debugFlow logs

codemod_function_name.js

//http://astexplorer.net/#/84e8ZqEAwQ/6
//http://www.datasciencecentral.com/profiles/blogs/write-code-to-rewrite-your-code-jscodeshift?utm_content=buffer598df&utm_medium=social&utm_source=linkedin.com&utm_campaign=buffer
//https://github.com/reergymerej/jscodeshift-article
//https://vramana.github.io/blog/2015/12/21/codemod-tutorial/
//https://github.com/benjamn/recast

function extractNodes(node){
    if (node.type === 'FunctionDeclaration') {
	var arr=[];
	arr.concat(extractNodes(node.left));
	arr.concat(extractNodes(node.right));
	return arr;
    }
    return [ node ]
}

module.exports = function (file, api) {
    const j = api.jscodeshift;
    const {
        expression, statement, statements
    } = j.template;
    const root = j(file.source);
    
    root.find(j.FunctionDeclaration).replaceWith(function (_if) {
	var fnCall = j.callExpression(j.identifier('debugFlow'),[j.identifier("'"+_if.node.id.name+"'")]);
	
	var ret = j.expressionStatement(fnCall);
	var stArr=[ret]
	stArr=stArr.concat(_if.node.body.body);
	var block = j.blockStatement(stArr);
	
	_if.node.body = block;      

	return _if.node;
    });
	var funcnum=1;
    root.find(j.FunctionExpression).replaceWith(function (_if) {
	if(!_if.node.id){
      _if.node.id='cb'+funcnum++;
    }
	var fnCall = j.callExpression(j.identifier('debugFlow'),[j.identifier("'"+_if.node.id+"'")]);
	
	var ret = j.expressionStatement(fnCall);
	var stArr=[ret]
	stArr=stArr.concat(_if.node.body.body);
	var block = j.blockStatement(stArr);
	
	_if.node.body = block;      

	return _if.node;
    });
    
    return root.toSource();
};