Using exports in javascript
Using exports in javascript
I am new to javascript and trying to use some generated code and running into some issues regarding exports. As file1 is auto-generated, if possible I would prefer to edit file2 only.
In file1.js I have:
var exports = function(apiClient) ApiClient.instance;
this.listAssets = function(opts, callback)
...
I want to use the function listAssets in file2.js. I tried doing the following in file2.js:
listAssets
var myInstance = require('../../jsCode/src/api/file1');
and then calling myInstance.getAssets(), but that is clearly incorrect. I assume that I am missing something pretty obvious, but after looking around I still couldn't figure it out. Any direction would be appreciated.
myInstance.getAssets()
exports
var
module.exports
Read through this, so if I want to keep the var exports part (Would prefer to not change autogenerated code) where can I use the module.exports?
– A. K.
Aug 24 at 19:52
Then you can do
module.exports = exports at the end of file1.js– Tobias K.
Aug 24 at 19:59
module.exports = exports
file1.js
2 Answers
2
Use module.exports:
module.exports
module.exports = function(apiClient) ApiClient.instance;
this.listAssets = function(opts, callback)
...
// now return an object containing the API you need in your import
return
apiClient: this.apiClient,
listAssets: this.listAssets
;
and then require the module as you suggested:
var myInstance = require('../../jsCode/src/api/file1')(apiClient);
This is called CommonJS and is a set of agreements of how to handle module exports and imports. Remember your imported function needs to be passed apiClient as an argument.
apiClient
Interesting - I assume that my problem is the passing apiClient. What does the (apiClient) after the require statement do?
– A. K.
Aug 24 at 20:10
It executes the imported function with
apiClient as an argument.– connexo
Aug 24 at 20:11
apiClient
And if file1 already requires apiClient and uses it, in file2 when I am importing file1, do I need to instantiate a new apiClient instance, or will that be taken care of by file1?
– A. K.
Aug 24 at 20:13
The way you access apiClient seems a little unusual. Can't you just require the apiClient in file1? Since your module in file1 exports its apiClient, you can use that in fileX where you import from file1.
– connexo
Aug 24 at 20:14
Earlier in file1 is the line
module.exports = factory(require('../ApiClient')– A. K.
Aug 24 at 20:15
module.exports = factory(require('../ApiClient')
You can use the following solution:
module.exports = function()
Where would I use this? In file2?
– A. K.
Aug 24 at 19:53
module.exports = function(apiClient)
– user3697034
Aug 24 at 19:53
that change isnt ideal as I would prefer to not change file1 (its autogenerated code), but even with this fix I still cant call the methods defined in this function. Any way to do this by changing my procedure in file2?
– A. K.
Aug 24 at 19:56
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Check stackoverflow.com/a/5311377/7362396 - basically it says you may use just
exports, but must not re-assign it like you do withvar. Or just use the fullmodule.exports.– Tobias K.
Aug 24 at 19:46