Call a local function within module exports from another function in module exports

Question

How do you call a function from within another function in a module exports declaration   app js  var bla   require    bla js    console log bla bar       bla js  module exports        foo  function  req  res  next        return   foo            bar  function req  res  next        this foo             I m trying to access the function foo from within the function bar  and I m getting      TypeError  Object   has no method  foo    If I change this foo   to just foo   I get       ReferenceError  foo is not defined

User · Answer

Another option  and closer to the original style of the OP  is to put the object you want to export into a variable and reference that variable to make calls to other methods in the object  You can then export that variable and you re good to go   var self       foo  function  req  res  next        return   foo           bar  function  req  res  next        return self foo           module exports   self

User · Answer

You can also do this to make it more concise and readable  This is what I ve seen done in several of the well written open sourced modules   var self   module exports        foo  function  req  res  next        return   foo            bar  function req  res  next        self foo

User · Answer

You can also save a reference to module s global scope outside the  module  exports somemodule definition   var  this   this   exports somefunction   function        console log  hello       exports someotherfunction   function         this somefunction

User · Answer

You could declare your functions outside of the module exports block   var foo   function  req  res  next      return   foo       var bar   function  req  res  next      return foo        Then   module exports       foo  foo    bar  bar

User · Answer

const Service       foo   a  b    gt  a   b    bar   a  b    gt  Service foo a  b    b    module exports   Service

User · Answer

To fix your issue  i have made few changes in bla js and it is working   var foo  function  req  res  next      console log  inside foo      return   foo       var  bar  function req  res  next      this foo      module exports    bar foo     and no modification in app js  var bla   require    bla js    console log bla bar

User · Answer

Change this foo   to module exports foo

User · Answer

Starting with Node js version 13 you can take advantage of ES6 Modules   export function foo         return  foo      export function bar         return foo          Following the Class approach   class MyClass        foo             return  foo              bar             return this foo             module exports   new MyClass      This will instantiate the class only once  due to Node s module caching  https   nodejs org api modules html modules caching

[node.js] Call a "local" function within module.exports from another function in module.exports?

Examples related to node.js

Examples related to express