Guide on exporting and implementing a function with Express

Question

Guide on exporting and implementing a function with Express

I'm facing a challenge with two files - alarm.js and notifications.js. In alarm.js, I need to invoke a method named sendPush from notifications.js.

My attempted solution:
I tried exporting the function from notifications.js:

module.exports.sendPush = function(params){
   console.log("sendPush from notifcations.js called");
   console.log(params);
}

Then, I imported it in alarm.js and attempted to use it :

let helperNotif = require('./notifications')
router.post("/", async (req, res) => {
    const params = {
        param1: 'a',
        param2: 'b'
    }
    helperNotif.sendPush(params)    
});

The issue at hand:
Despite my efforts, I keep encountering an error stating that

helperNotif.sendPush is not a function

The main concern:
How can I successfully call the notification.js sendPush function from my alarm.js file?

[EDIT] It's worth mentioning that in notifications.js, there are some router.get and router.post functions followed by module.exports = router; at the end.

javascript express express-router

Answer 1

Answer №1

If the content of your notifications.js file ends with module.exports = router, it will replace any previous definition of module.exports.sendPush = .... In order to export both the router and sendPush, you can do the following:

function sendPush(params){
   console.log("sendPush from notifications.js has been invoked");
   console.log(params);
}
...
module.exports = {router, sendPush};

To import the router in another file, you will need to write:

const {router} = require("./notifications.js");

Answer 2

If the content of your notifications.js file ends with module.exports = router, it will replace any previous definition of module.exports.sendPush = .... In order to export both the router and sendPush, you can do the following:

function sendPush(params){
   console.log("sendPush from notifications.js has been invoked");
   console.log(params);
}
...
module.exports = {router, sendPush};

To import the router in another file, you will need to write:

const {router} = require("./notifications.js");

Guide on exporting and implementing a function with Express

Answer №1

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