And that’s really all you need to know to write a module! Rather than tagging each exported feature, you can write out a single list of all the names you want to export, wrapped in curly braces: An export list doesn’t have to be the first thing in the file; it can appear anywhere in a module file’s top-level scope. This setting does not apply to the standard library, which is always compiled with :static-fns implicitly set to true. Already played around with modules in the past, but reading through this article I realized that I will probably stick to using `require` even once ES6 is generally available. Class declarations are not hoisted, so your example above: // no `export` keyword required here An ES6 module is a file containing JS code. It doesn’t seem particular agnostic, though. MikeMKH / repl.clj. The ES6 module syntax is very static, and that’s good—it’s paying off in the form of powerful compile-time tools. I told you the answer was “nothing”. No such functionality is built-in to ES6. That list of weaknesses (“Static vs. dynamic, or: rules and how to break them”) really hit home hard. Sometimes the main module of a package is little more than importing all the package’s other modules and exporting them in a unified way. Lodash to ES6. [Performance] Lodash vs ES6 : map() by@peterchang_82818 [Performance] Lodash vs ES6 : map() Originally published by Peter Chang on May 13th 2018 15,140 reads @peterchang_82818Peter Chang. ES6 (whose official name is ECMAScript 2015) is the latest version of JavaScript. ES6 leaves the details of module loading entirely up to the implementation. import foo from ‘foo.js’ ES6 modules are automatically strict-mode code, even if you don’t write "use strict"; in them. Install n_ for Lodash use in the Node.js < 6 REPL. The class name is visible throughout the module—the name is hoisted to the top of the enclosing scope. thanks for this article about ES6. I’ve translated this article into Chinese, I wish I have your permission. By this time, import processing is already finished, so when execution reaches a line of code where there’s an import declaration… nothing happens! Tools like underscore and Lodash – are they now obsolete, with ES6 features replacing most of the utility belt that they had provided? Sign up for the Mozilla Developer Newsletter: If you haven’t previously confirmed a subscription to a Mozilla-related newsletter you may have to do so. React Native uses Babel behind the scenes to … Chance of unintended consequence: 100%. lodash's iteration functions don't support ES6 iterators yet. For example, as of this writing, the famous colors package doesn’t have any special ES6 support as far as I can tell. I strongly feel the urge to break this “module” into separate (short) files so the TLS connection handling can live separate from the JSON XML code, etc. Sign in The module system works very much like require.js in environments, like the browser, where all I/O is async. We have good habits. Can a module import both the default export and other named exports from another module, at the same time? I won’t deny that there are problems. Once we hit the 10 utilities mark, lodash-es pulls ahead in smallest bundle size. However, we now offer a 4 kB (gzipped) core build that’s compatible with Backbone v1.2.4 for folks who want Lodash without lugging around the kitchen sink. Why couldn’t an import simply return a promise and if you wanted the current behaviour you would simply write `await import x` (true that’s ES7, but that’s not going to take *that* long). In the meantime you can use compilation. // Regular external script ESLint rules for lodash/fp. Work to add something like