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node_modules/minifyfromhtml/minifyfromhtml.js

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+let argv = require('minimist')(process.argv.slice(2));
+let fs = require('fs');
+let path = require('path');
+let Terser = require('terser');
+let CleanCSS = require('clean-css');
+let jsdom = require('jsdom');
+let JSDOM = jsdom.JSDOM;
+
+process.on('unhandledRejection', up => { throw up; });
+
+let usage = `usage:
+	minifyfromhtml --js=<output js file> --css=<output css file> --exclude=<exclude files> < <input file>
+
+	the minification process uses minify under the hood.
+	http://coderaiser.github.io/minify/
+
+	example:
+	minifyfromhtml --js=dist/mywidget.min.js --css=dist/mywidget.min.css --exclude=js/jquery.js < example/index.html
+`;
+
+if (argv.h) {
+	console.log(usage);
+	process.exit(0);
+}
+
+if (!argv.js && !argv.css) {
+	console.log(usage);
+	process.exit(0);
+}
+
+let excludeFiles = argv.exclude || [];
+if (typeof(excludeFiles) === 'string') {
+	excludeFiles = [excludeFiles];
+}
+
+let readStdin = function(cb) {
+	let stdin = '';
+	process.stdin.resume();
+	process.stdin.setEncoding('utf-8');
+	process.stdin.on('data', function(buf) {
+		stdin += buf;
+	});
+	process.stdin.on('end', function() {
+		cb(stdin);
+	});
+};
+
+
+readStdin(function(html) {
+	let dom = new JSDOM(html);
+	let getTagAttrs = function(dom, tag, attr, filter) {
+		let elements = [];
+
+		let document = dom.window.document;
+		let elementTags = document.getElementsByTagName(tag);
+		let i = elementTags.length;
+		for (let i = 0; i < elementTags.length; i++) {
+			if (!filter ||
+				(filter && elementTags[i].getAttribute(Object.keys(filter)[0]) === filter[Object.keys(filter)[0]])) {
+				let src = elementTags[i].getAttribute(attr);
+				if (src) {
+					elements.push(src);
+				}
+			}
+		}
+		return elements;
+	};
+
+	let processJs = function(things, outFile) {
+		let terserOptions = {
+			output: {
+				comments: false
+			},
+			sourceMap: {
+				includeSources: true,
+				url: path.basename(outFile) + '.map'
+			}
+		};
+
+		//remove exluded
+		excludeFiles.forEach(i => {
+			let index = things.indexOf(i);
+			if (index !== -1) {
+				things.splice(index, 1);
+			}
+		});
+
+		let code = {};
+		for (let i = 0; i < things.length; i++) {
+			let thing = things[i];
+			code[thing] = fs.readFileSync(thing, 'utf8');
+			console.log(thing + ' -> ' + outFile);
+		}
+
+		const data = Terser.minify(code, terserOptions);
+		fs.writeFileSync(outFile, data.code);
+		if (data.map) {
+			fs.writeFileSync(outFile + '.map', data.map);
+		}
+	};
+
+	let processCss = function(things, outFile) {
+		fs.writeFileSync(outFile, '');
+		for (let i = 0; i < things.length; i++) {
+			let thing = things[i];
+			console.log(thing + ' -> ' + outFile);
+			let minified = new CleanCSS().minify(fs.readFileSync(thing, 'utf8'));
+			fs.appendFileSync(outFile, minified.styles);
+		}
+	};
+
+	if (argv.js) {
+		processJs(getTagAttrs(dom, 'script', 'src'), argv.js);
+	}
+
+	if (argv.css) {
+		processCss(getTagAttrs(dom, 'link', 'href', {rel: 'stylesheet'}), argv.css);
+	}
+});