ESM-CJS interop test Test Cases Results Node.js Babel Webpack Rollup.js Parcel esbuild Results by test case Results by syntax import x and similar import { named } and similar import { __esModule } and similar import * and similar import() and similar require().default and similar require().named and similar require().__esModule and similar require() and similar Direct differences Webpack <-> Node
Discussion 1. CommonJS は tree shaking されない ※追記、修正あり すべてのモジュールバンドラーが、 import { isEqual } from 'lodash'; を tree shaking できませんでした。これは、 CommonJS は静的に解析することができない困難または不可能（2018/06/15 修正）なためです。 例えば、 ES Modules の import, export に対応する CommonJS の require、 exports は、それぞれ以下のように動的に書くことが許容されています。 require const fooOrBar = require(Math.random() < 0.5 ? 'foo' : 'bar'); exports for(const name of ['foo', 'bar']) { ex
Note: “ES5+” means “whatever language features are supported by the JavaScript engines you are targeting”. Background: JavaScript module formats # At the moment, these are the most common JavaScript module formats: AMD (asynchronous module definition): an asynchronous module format for browsers. CJS (CommonJS): a synchronous module format designed for servers (such as Node.js). Due to the popular
So last week I wrote about my experiences with upgrading to Webpack 2. In that story, I mentioned that it seemed like Webpack v2 was much faster than v1. So why not try and benchmark each version and provide some numbers? Disclaimer: I’m not a performance engineer or a statistician. Take this story as a data-point and do your own comparisons. I have no vested interests in any of the technologies m
15 Aug The cost of small modules Posted August 15, 2016 by Nolan Lawson in performance, Web. 53 Comments Update (30 Oct 2016): since I wrote this post, a bug was found in the benchmark which caused Rollup to appear slightly better than it would otherwise. However, the overall results are not substantially different (Rollup still beats Browserify and Webpack, although it’s not quite as good as Clos
19 Oct The struggles of publishing a JavaScript library Posted October 19, 2015 by Nolan Lawson in Webapps. Tagged: javascript, modules, npm. 19 Comments If you’ve done any web development in the past few years, then you’ve probably typed something like this: $ bower install jquery Or maybe even: $ npm install --save lodash For anyone who remembers the dark days of combing Github for jQuery plugin
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