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Ok, so do you love ES2015 yet? Man, I sure do. So... let's go use it immediately on our site! Oh wait.... didn't I mention that its features aren't supported by all browsers? Whoops. Yea, the latest version of Chrome supports everything... but if some of our users have older browsers, does this mean we can't use ES2015?
Nope! You can! Thanks to an amazing tool called Babel. But before we talk about it, we need to do a little bit of installation. In the Node.js world, the package manager is called npm, and because you already installed Node, you already have it!
But wait! There's a disturbance in the Node.js package manager force. Yes, there
is another... package manager... called Yarn! It's sort of a competitor to npm, but
they work almost identically. For example, in PHP, we have a
In Node, we will have a
package.json... and you can use either
to read it.
In other words,... you can use
yarn: they basically do the same thing.
You could even have some people on your team using
npm, and others using
We're going to use Yarn... because it's a bit more sophisticated. But, that means you need to install it! I'm on a Mac, so I already installed it via Brew. Check Yarn's Docs for your install details.
To use Yarn, we need a
package.json file... which we don't have yet! No worries,
to create one, run:
It'll ask a bunch of questions - none are too important - and you can always
update your new
package.json file by hand later:
Ok, the wonderful tool that will fix all of our browser compatibility problems
with ES2015 is called Babel. Google for it to find
Go to Setup. In our case, to see how it works, we're going to use the CLI,
which means we will run Babel from the command line. To install Babel CLI, it wants us
npm install --save-dev babel-cli.
But don't do it! Since we're using Yarn, run:
yarn add babel-cli --dev
That does the same thing, but with more exciting output!
This made a few changes to our project. Most importantly, it added this
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It also created a
yarn.lock file: which works like
composer.lock. And finally,
the command added a new
node_modules/ directory, where it downloaded
and all of its friends, um, dependencies. That is the
vendor/ directory for Node.
Open up your
.gitignore file. At the bottom, let's ignore
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We don't need to commit that directory because - thanks to the
yarn.lock files - anyone else can run
yarn install to download everything they need.
Okay, enough setup! Let's use Babel!