I have two constructors in two separate files that have to depend on each other in their methods. Is it okay to put the 'require' call inside the methods that depend on the other models?

gistfile1.js

// '/models/a.js'

function A(){
  this.type = 'a'
}

A.prototype.delete = function deleteA(callback){
  var self = this;
  
  self.findAllBs(function(err, res){
    res.forEach(function(b){
      var b = new B(b);
      b.delete();
    });
  });
}



// '/models/b.js'


function B(){
  this.type = 'b'
}

B.prototype.read = function readB(callback){
  var self = this;
  
  var myA = new A(self.a)
  myA.read(function(err, res){
    return callback(null, 'My A:'+ res);
  })
}