CS2 Discussion: Project: Progress as of February 2017: 2.0.0-alpha1!

[GeoffreyBooth]

Hey everyone,

CoffeeScript 2.0.0-alpha1 is released! Install it via: npm install coffeescript@next

You may notice that it’s not at coffee-script. The powers that be at NPM were kind enough to release the coffeescript package name to us. Since no one really spells CoffeeScript with a hyphen anymore, it seemed a better choice. It has both the old versions and 2.0.0-alpha1, and will be the home for future versions. coffee-script will stay 1.x-only, in case anyone installs coffee-script and expects a compiler that outputs ES3.

Since the last update, as of 2017-02-21 the following has been merged into the jashkenas/coffeescript 2 branch:

• Classes, including idiomatic output for both the class and super keywords, thanks to @connec.
• Redesigned docs for v2, thanks to @GeoffreyBooth.
• Refactored Cake tasks adding watch modes to building the compiler, thanks to @GeoffreyBooth.

As of December, we had accomplished:

• Tagged template literals, thanks to @greghuc.
• Interpolated strings are now output as template literals (ES backtick syntax), thanks to @greghuc.
• Triple-backtick operator and escaped backticks in embedded JavaScript, thanks to @GeoffreyBooth.
• The browser tests work again, thanks to @GeoffreyBooth.

And as of November, we had accomplished:

• Async/await, thanks to @GabrielRatener.
• Arrow functions, function default parameters and function rest parameters, thanks to @GeoffreyBooth.
• Splats in arrays and function calls are output using ES2015 syntax, thanks to @connec.
• Computed properties are output using ES2015 syntax, thanks to @connec.
• Octal and binary literals are output as-is, thanks to @JimPanic.
• CoffeeScript is stricter about whitespace thanks to @eelco, and Literate CoffeeScript now understands Markdown thanks to @billymoon.
• Support for ES2015 for…of is implemented, thanks to @atg.
• Bugs were fixed by @alangpierce, @shreeve, @JimPanic, @GeoffreyBooth and others. Also thanks for feedback from @lydell and @jashkenas.

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There are still a handful of features yet to implement, including destructuring and getters/setters. Help with those is most welcome, but if you don’t have time for that, you could also help out by trying 2.0.0-alpha1 in your projects. Please review the breaking changes first, and if you think there’s a bug, please open an issue with “[CS2]“ in the title. Please don’t comment bug reports on this thread. Thanks!

[tiye]

Any clarification for npm info coffeescript?

     '1.12.4',
     '2.0.0-alpha1',
     '99.999.9999',
     '99.999.99999' ],

[GeoffreyBooth]

The 99 versions are leftovers from the previous package, which was just a warning that you had misspelled CoffeeScript.

[tiye]

Will it affect 2.0.0? It's strange that npm does not pick the higher version which is 99.x.

[lydell]

npm install foo is just a shorthand for npm install foo@latest. It is up to the publisher to decide what the latest tag should point to.

[nickdima]

Great job everybody! I'm curious what new oportunities will CS2 bring around tooling (stuff like linting, auto-formatting, etc.) and how it could benefit from the babel & co. ecosystem.

[scottwarren]

What are your guys thoughts on outputting something when people install coffee-script to let them know that the "latest" is a package name change, and now lives at coffeescript instead?

[GeoffreyBooth]

@scottwarren Maybe after 2.0.0 final is released, that's a thought.

[lydell]

@nickdima Basically none. CS2 uses the same architecture as CS1.

[DomVinyard]

awesome! well done guys, we're lucky to have you. Now, I guess I need to start a new project to test all this stuff out on! Hmmm... choices, choices... x

[YamiOdymel]

I'm using CoffeeScript 2 with WebPack and Vue.js and it works great! (except for the spread operator)

[laurentpayot]

To use CS2 with webpack I simply had to create a symbolic link from coffeescript to coffee-script in my node_modules folder. It's working fine. I see that @YamiOdymel already created an issue in coffee-loader: webpack-contrib/coffee-loader#27 😄

[GeoffreyBooth]

@YamiOdymel Thanks! As for the spread operator, that seems like something that should be implemented as part of destructuring (#69) which I’ve started a branch for if you’d like to take a crack at it . . . 😉

[GeoffreyBooth]

Has anyone tried CS2 on an existing project? What changes, if any, did you need to make to your code?

[joeldrapper]

@GeoffreyBooth I was going to integrate it into an existing Rails app, but the coffee-script-source gem doesn’t have the alpha yet. I’d submit a PR, but it appears to be closed source?

[GeoffreyBooth]

@joeldrapper I don’t know anything about that gem. We probably won’t be submitting CoffeeScript to upstream packages like that one until 2.0.0 final is released. Could you perhaps install the gem and then manually replace the CoffeeScript lib folder inside it?