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index.js
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index.js
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const { JSDOM } = require("jsdom");
const { minify } = require("html-minifier-terser");
const ATTRIBUTES = [
{
tag: "audio",
attribute: "src",
},
{
tag: "embed",
attribute: "src",
},
{
tag: "img",
attribute: "src",
},
{
tag: "img",
attribute: "srcset",
},
{
tag: "input",
attribute: "src",
},
{
tag: "link",
attribute: "href",
},
{
tag: "object",
attribute: "data",
},
{
tag: "script",
attribute: "src",
},
{
tag: "script",
attribute: "href",
},
{
tag: "script",
attribute: "xlink:href",
},
{
tag: "source",
attribute: "src",
},
{
tag: "source",
attribute: "srcset",
},
{
tag: "track",
attribute: "src",
},
{
tag: "video",
attribute: "poster",
},
{
tag: "video",
attribute: "src",
},
{
tag: "image",
attribute: "xlink:href",
},
{
tag: "image",
attribute: "href",
},
{
tag: "use",
attribute: "xlink:href",
},
{
tag: "use",
attribute: "href",
},
];
const MINIMIZE = {
caseSensitive: true,
collapseWhitespace: true,
conservativeCollapse: true,
keepClosingSlash: true,
minifyCSS: true,
minifyJS: true,
removeComments: true,
removeRedundantAttributes: true,
removeScriptTypeAttributes: true,
removeStyleLinkTypeAttributes: true,
};
// Regex to match sources in srcset
const SRCSET = /(?:^|,)\s*(\S+)/g;
// Get dependencies from attribute of element
async function getDependencies(element, attribute) {
// Get source from attribute of element
let source = element.getAttribute(attribute);
// Parse srcset
const paths =
attribute === "srcset"
? [...source.matchAll(SRCSET)].map(([, path]) => path)
: [source];
// Replace each path with the processed dependency
for (const path of paths) {
source = source.replace(path, await this.addDependency(path));
}
// Set the processed source attribute
element.setAttribute(attribute, source);
}
module.exports = async function (content, _options = {}) {
const options = {
attributes: true,
minimize: false,
..._options,
};
// Build DOM of the content
const dom = new JSDOM(content);
const { document } = dom.window;
if (options.attributes) {
// Find all dependencies from attributes
for (const { tag, attribute } of ATTRIBUTES) {
const elements = [...document.querySelectorAll(tag)];
for (const element of elements) {
if (!element.hasAttribute(attribute)) continue;
// Get dependencies from element
await getDependencies.bind(this)(element, attribute);
}
}
}
// Serialize DOM
let html = dom.serialize();
// Option to minimize HTML
if (options.minimize) {
html = minify(html, { ...MINIMIZE, ...options.minimize });
}
return html;
};