polymer-build.js

'use strict';

const build = require('polymer-build');
const merge = require('merge-stream');
const path = require('path');
const rename = require('gulp-rename');
const size = require('gulp-size');

/**
 * Executes the polymer-build, which a.o. vulcanizes and minifies the HTML
 * 
 * @param {Object} config Content of polymer.json
 * @returns 
 */
function polymerBuild(config) {
	const skipRootFolder = function(file) {
		const rootFolder = config.root || '.';
		file.dirname = path.relative(rootFolder, file.dirname);
	};

	const project = new build.PolymerProject(config);

	const bundler = project.bundler({
		// XXX: sourcemaps makes V8 run out of memory
		sourcemaps: false,
		stripComments: true,
	}).on('error', e => console.error(e));

	return merge(project.sources(), project.dependencies())
		.pipe(bundler)
		.pipe(size({title: 'polymer-bundler'}))
		.pipe(rename(skipRootFolder));
};

module.exports = polymerBuild;