Importing a javascript file in another file and compiling using Node.js

Question

To run my practice JS files I have used Node so for example I say node bts.js . I needed a queue data structure so I installed Collections using npm install collections --save and also seen in picture it does show in the hierarchy.

Then in my JS file I said const Deque = require('./collections/deque'); and then later I wanted to use it like const dq = new Deque(); but I get the 'MODULE_NOT_FOUND' error. But why? I have attached the screen shot if my structure too.

As is stated in the docs, you need: var Deque = require("collections/deque"); (since collections is a module, not a script in your main folder)` — user5734311
– user5734311, Commented Jul 20, 2020 at 11:33

Tsvetan Ganev · Accepted Answer · 2020-07-20 11:36:41Z

1

You're trying to import an external module (installed in node_modules) with a relative path - ./collections/deque. This will look in local folder in your source code named collections and try to find a file named deque.js inside of it. Since it does not exist, you get the module not found error.

You have to import the dependency from node_moduels as:

const Deque = require("collections/deque"); // see the missing ./ at the start of the path

answered Jul 20, 2020 at 11:36

Tsvetan Ganev

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