This example project is to explain how to use a configuration file with the Lasso.js command line interface.

Lasso.js is an eBay open source Node.js-style JavaScript module bundler and asset pipeline that also provides first-level support for optimally delivering JavaScript, CSS, images and other assets to the browser.

This tool offers many different optimizations such as a bundling, code splitting, lazy loading, conditional dependencies, compression, JS/CSS/IMG minification, Base64 image encoding, and fingerprinted resource URLs. Plugins are provided to support pre-processors and compilers such as Less, Stylus and Marko.

git clone https://github.com/lasso-js-samples/lasso-config.git
cd lasso-config
npm install

This sample app uses a local installation of the lasso-cli module, but you can also install it globally using the following command:

npm install lasso-cli --global

npm start

Open https://localhost:8080 in your web browser to test out your page.

lasso-config.json:

{
    "plugins": [
        "lasso-less" /* Unable preprocessing for Less files
    ],
    "outputDir": "build/static/", /* Output directory for all generated assets */
    "urlPrefix": "/static", /* Prefix added to all generated URLs */
    "fingerprintsEnabled": true, /* Add a "fingerprint" to the generated resource URL (changes when file changes)
    "minify": true, /* Minify JavaScript and CSS */
    "resolveCssUrls": true, /* Resolve resource URLs found in CSS fils */
    "bundlingEnabled": true, /* Concatenate resources together */
    "bundles": [ /* Preconfigured bundles */
        {
            "name": "jquery",
            "dependencies": [
                "require: jquery"
            ]
        },
        {
            "name": "math",
            "dependencies": [
                "require: ./src/add"
            ]
        }
    ]
}

The configuration file to run lasso is ./lasso-config.json. Running the above command will result in JavaScript and CSS bundles being written out to the ./static directory.

The JavaScript and CSS dependencies for src/index.html are declared in src/browser.json.