Because different people write different parts of the code, and some of them are older than ES6 ;)
What's your interest? We're currently doing some updating and eslinting of the codebase that's related.

Would it be ok if I create pull request with some updated code?

I'll close this since we can track progress through your pull requests :)

I'm reopening after all, it'll be useful to have somewhere to discuss things that are relevant for all the PRs. There is a concern here about performance and size bloat due to transpilations, which we currently don't have a way to benchmark for Pull Requests.

We might want to come up with a subset of features we know to be "safe".
My suggestions:

• template strings with interpolation
• object property short-hand (let obj = { someProperty }).
• let/const

Avoid array destructuring and anything, for of, and anything requiring regenerator or other babel polyfills.

@locks We could have used js-codemod scripts. instead of doing it manually everywhere.
https://github.com/cpojer/js-codemod#included-scripts

We used the same tool, for converting our old files to ES6.

FYI https://lebab.io/

@manimis902 I don't know how @artemgurzhii is doing it :P

Lebab converting code using for of loop, String.includes and some other methods which are throwing errors and tests are failing, so mostly I'm trying to do this by myself.

@artemgurzhii what is the status? Can I help you by taking one part of job in converting to ES6?

@GitHubSathishKumar This is the list of all packages, that I haven't refactored yet.

• container
• ember-glimmer
• ember-testing
• external-helpers
• internal-test-helpers
• loader

@artemgurzhii what is the state of this?

Thank you!

@Serabe ember-glimmer has nothing to refactor as it always stays up to date. I'm not sure about loader package, but as I noticed it can't be changed, as it not compiled through babel, and making any changes makes all tests fail. I was trying to refactor external-helpers but it has no tests, so I'm afraid to break something) And I just got refactored container and internal-test-helpers packages. I haven't refactored ember-testing and also, I was having problems refactoring internal-test-helpers/lib/factory.js.