Calling webpacked code from outside (HTML script tag)

javascript

webpack

promises

es6-syntax

byAnton Shumikhin·Jan 24, 2025

To invoke webpacked functions from an HTML script, expose them using webpack's output.library. Define a global namespace and export your functions.

In your module.js:

// Export a function, cool as a cucumber.
export function myFunction() {
    // Going through function implementation like it’s no biggie!
}

Modify webpack.config.js:

// Define 'MyLib' to let browsers in on webpack's little secret.
module.exports = {
    output: {
        library: 'MyLib',
        libraryTarget: 'var'
    },
};

In your HTML:

<script src="bundle.js"></script> <!-- Your webpack secrets bundled here-->
<script>
    MyLib.myFunction(); // Call it and see the magic
</script>

The bundle.js is your compiled file. Replace "MyLib" with your namespace, and "myFunction" with your specific function name.

Exporting your way to glory with global namespace

Drawing from best practices of code organization, a library and libraryTarget used in tandem promote a global namespace. This technique eliminates pollution in the global namespace, ensures organization, and aids in efficiency.

Playing safe with Promises

When your webpacked code relies on asynchronous operations, wrap your module exports in Promises to play safe. It ensures your components are up and running before being accessed globally.

ES6 syntax: Your code’s personal stylist

Implementing the ES6 import/export syntax in your webpacked code is like hiring a stylist for your code: It makes your code look good, and readability gets a super boost.

The universal solution trump card—Advanced webpack configuration

For catering to all—the browser, AMD, and CommonJS modules—play the universal 'umdtrump card in thelibraryTarget`.

When you have more pages than a book — Multiple page applications

Using a single webpack bundle across multiple pages simplifies and smoothens the process.

Good paths lead to successful access

Double-check the path and filename in the webpack.config.js output. Your script tag must accurately point to the webpack bundle.

Dodging pitfalls with `require`

Keep away from require for accessing module exports in your script tags. require is primarily for Node.js and might not serve you well in a browser environment.

explain-codes / Javascript / Calling webpacked code from outside (HTML script tag)

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