基于Grunt的项目中的NPM模块

Question

Node has a simple module loading system which uses require() method call to load modules from different locations in the root folder. Eg

var qr = require('qr-image');    

I am trying to do something similar in grunt but i am unsuccessful with that.

I had added this module to package.json file in the following fashion and then ran npm install at root directory of the project.

"devDependencies": {
    .
    .
    .

    "qr-image": "^2.0.0"
}, 

Now whenever I use require I get the following error on console and my code breaks.

ReferenceError: require is not defined

Please suggest as how to use the npm module in Grunt based project, Thanks.

Answer 1

The require function isn't available in web browsers. Instead it's part of nodejs, which is a server-side language (eg, something you might run directly from your computer terminal, not in a browser) and used to load dependencies in that language.

In a web browser, I usually just include my dependencies as additional scripts on the page, eg,:

<script src="path/to/my/dependency.js"></script>
<script src="path/to/my/code.js"></script>

Some other options are RequireJS or what's listed in this question or as more of a general purpose dependency manager for front-end code: Bower .

Looking closer at your question, it's likely that the "qr-image" npm dependency won't work in client-side code for you (since it was built to run via node in server-side code).

A quick search for QR code client-side code brought up this SO post , which points to the QRCode.js project for client-side QR code generation—I haven't used it, but it looks like a step in the right direction for what you're working on.