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index.js
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index.js
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/*!
* Written by Addy Osmani
* Copyright (C) 2014 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
'use strict';
const cheerio = require('cheerio');
const types = {
stylesheets: {
selector: 'link[rel*="stylesheet"]',
attribute: 'href',
},
scripts: {
selector: 'script',
attribute: 'src',
},
imports: {
selector: 'link[rel="import"]',
attribute: 'href',
},
preload: {
selector: 'link[rel*="preload"][as="style"]',
attribute: 'href',
},
links: {
selector: 'a',
attribute: 'href',
},
images: {
selector: 'img',
attribute: 'src',
},
styles: {
selector: 'style',
method: 'text',
},
};
function oust(src, type, raw) {
if (typeof src !== 'string' || !type) {
throw new Error('`src` and `type` required');
}
const validTypes = Object.keys(types);
const typeArray = Array.isArray(type) ? type : [type];
for (const type of typeArray) {
if (!validTypes.includes(type)) {
throw new Error(`Invalid \`type\` value "${type}". Choose one of: ${validTypes.join(', ')}`);
}
}
const $ = cheerio.load(src);
const chosenTypes = typeArray.map(type => ({...types[type], type}));
const $selector = $(chosenTypes.map(type => type.selector).join(', '));
return [...$selector].map(element => {
const $el = $(element);
const {type, method, attribute} = chosenTypes.find(type => $el.is(type.selector));
const value = (method && $el[method]) ? $el[method]() : $el.attr(attribute);
return raw ? {$el, type, value} : value;
});
}
module.exports = (src, type) => oust(src, type, false);
module.exports.raw = (src, type) => oust(src, type, true);