Is it possible to reveal the JS constructor for a front end NPM library?

After finally publishing my first package on NPM, I encountered some frustrating issues that I just can't seem to solve. I have a feeling that the solution is right in front of me, but I need to ask for help before I lose my mind.

The problem arises when I try to bundle the files using browserify. I have encapsulated my micro-lib in an IIFE and I am attempting to module.export the constructor at the end of the IIFE. Here is a snippet of what it looks like:

var Package = (function() {

    /* Constructor */
    function Package(foo, bar) {
       this.foo = foo;
       this.bar = bar;
    }

     // Several private methods (not necessarily private)

    // API methods I want users to access from the browser console

    Package.prototype.$method = function() {
        return this.foo;
    };

    return Package;
})();

// Expose constructor?
module.exports = Package;

My aim is to enable users to require my package like this:

var package = require('package-name');
var P = new package(foo, bar);

So far, the above code works fine. I can log `P` to the console without any issues. However, when I want users to access the prototype method like this:

P.$config();

It doesn't work as expected. The user successfully instantiates the object from the package, but when they try to access the prototype method, it returns `undefined`. It seems that after bundling the file with browserify and wrapping it in an IIFE, the package is no longer accessible from the browser console. What am I missing here? I know there are probably several things, but I can't seem to figure it out.

I've attempted bundling with browserify using `--standalone` to expose the `module.exports` package variable, but it's not solving the issue. Can someone please take a moment to explain the workflow for publishing an npm (front end) package? Do I need to remove the IIFE around my package and have the constructor exposed openly?

Thank you in advance for your help. I really appreciate it.

Answer №1

Your module implementation is solid, but there is a specific step you need to address. Create a script.js file to access the global variable h like so:

h = require('./index.js');   // This is the file containing your module

After that, utilize browserify:

browserify script.js > lel.js

Now you can integrate it into your application by following these steps:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>

    <script src="lel.js"></script>
    <script>
        var lel = new h(123, 456);

        console.log(lel.$method()); // Output: 123
    </script>
</body>
</html>

While I can't guarantee this is the most optimal practice, it has worked flawlessly for me.

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