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Use util.promisify

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This commit is contained in:
Jason Miller
2018-04-03 16:56:04 -04:00
parent f49bcbae87
commit e14502929b
1 changed files with 14 additions and 21 deletions
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35
config/critters-webpack-plugin.js
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@@ -1,10 +1,13 @@
const fs = require('fs');
const { promisify } = require('util');
const path = require('path');
const parse5 = require('parse5');
const nwmatcher = require('nwmatcher');
const css = require('css');
const prettyBytes = require('pretty-bytes');
const readFile = promisify(fs.readFile);
const treeAdapter = parse5.treeAdapters.htmlparser2;
const PLUGIN_NAME = 'critters-webpack-plugin';
@@ -161,46 +164,36 @@ module.exports = class CrittersWebpackPlugin {
};
/** Predicate for non-comment CSS AST nodes */
function notComment(rule) {
return rule.type !== 'comment';
}
/** Recursively walk all rules in a stylesheet. */
/** Recursively walk all rules in a stylesheet.
* The iterator can explicitly return `false` to remove the current node.
*/
function visit(node, fn) {
if (node.stylesheet) return visit(node.stylesheet, fn);
node.rules.forEach((rule) => {
node.rules = node.rules.filter(rule => {
if (rule.rules) {
visit(rule, fn);
}
fn(rule);
return fn(rule)!==false;
});
}
/** Promisified fs.readRile */
function readFile(file) {
return new Promise(((resolve, reject) => {
fs.readFile(file, 'utf8', (err, contents) => {
if (err) reject(err);
else resolve(contents);
});
}));
}
/** Enhance an htmlparser2-style DOM with basic manipulation methods. */
function makeDomInteractive(document) {
defineProperties(document, DocumentExtensions);
document.documentElement = document.childNodes[document.childNodes.length - 1];
// Find the first <html> element within the document
document.documentElement = document.childNodes.filter( child => String(child.tagName).toLowerCase()==='html' )[0];
// Extend Element.prototype with DOM manipulation methods.
// Note: document.$$scratchElement is also used by createTextNode()
const scratch = document.$$scratchElement = document.createElement('div');
const elementProto = Object.getPrototypeOf(scratch);
defineProperties(elementProto, ElementExtensions);
elementProto.ownerDocument = document;
// nwmatcher is a selector engine that happens to work with Parse5's htmlparser2 DOM (they form the base of jsdom)
// nwmatcher is a selector engine that happens to work with Parse5's htmlparser2 DOM (they form the base of jsdom).
// It is exposed to the document so that it can be used within Element.prototype methods.
document.$match = nwmatcher({ document });
document.$match.configure({
CACHING: false,