Metalsmith HTML Minifier

A Metalsmith plug-in to minify HTML files using kangax/html-minifier.

Be aware that certain optimizations are enabled by default in this plug-in, some of which may not be what you want. Please read the documentation to ensure you understand what is happening to your markup and disable options as required.

Installation

The usual:

$ yarn add metalsmith-html-minifier

How do I use this thing?

A quick example:

const Metalsmith   = require("metalsmith");
const htmlMinifier = require("metalsmith-html-minifier");
Metalsmith(__dirname)
    .use(htmlMinifier()) // Use the default options
    .build();

The above will minify all the HTML files (files ending in .html) it processes. To provide a custom glob for files to minify:

const Metalsmith   = require("metalsmith");
const htmlMinifier = require("metalsmith-html-minifier");
Metalsmith(__dirname)
    .use(htmlMinifier({
        pattern: "**/*.html",
    }))
    .build();

You can also pass an array of globs to match filenames:

const Metalsmith   = require("metalsmith");
const htmlMinifier = require("metalsmith-html-minifier");
Metalsmith(__dirname)
    .use(htmlMinifier({
        pattern: ["**/*.html", "**/*.xhtml"],
    }))
    .build();

To pass options to the minifier (to enable or disable optimizations):

const Metalsmith   = require("metalsmith");
const htmlMinifier = require("metalsmith-html-minifier");
Metalsmith(__dirname)
    .use(htmlMinifier({
        minifierOptions: {
            removeComments: false,
            // etc.
        },
    }))
    .build();

Options

See Options Quick Reference for a full reference. The options passed to the plug-in are merged with the defaults below and passed to the minifier directly.

The following options are enabled by default. To disable any of these you will need to explicitly set them to false.

Option	Description
collapseBooleanAttributes	Omit attribute values from boolean attributes
collapseWhitespace	Collapse white space that contributes to text nodes in a document tree
removeAttributeQuotes	Remove quotes around attributes when possible
removeComments	Strip HTML comments
removeEmptyAttributes	Remove all attributes with whitespace-only values
removeRedundantAttributes	Remove attributes when value matches default

Tests

To run the tests:

$ npm test

License

This software is released under the MIT License. See LICENSE.md for more information.