ES6 migrations

This is something ~I plan on working on in the middle of May~ a bunch of people are helping out on! 😄

• var -> let / const
• _.includes(array) -> array.includes (dropping v4 support at the end of April makes this possible)
• _.each(array) -> array.forEach
• _.isArray(array) -> Array.isArray(array) - Only if it removes the necessity of requiring lodash in a specific file
• _.isEmpty(array) -> array.length === 0 (or !array.length)
• Remove other lodash dependencies as needed on a file-specific basis (the goal isn’t to purge lodash, it’s to reduce unnecessary requires of the large library)
  • In that note, use Object destructuring to import required components as needed
  • Use you might not need lodash but don’t go overboard
• remove usage of var self = this (arrow functions instead)
• Use defaults (I’m not sure if this is applicable) (i.e. (a = 2, b = 2) => a + b)
• Use template literals when possible

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Checklist:

• Arrow functions do not replace named functions
• var -> const / let
• Array.(includes / each / isEmpty / isArray) lodash usage minimized
• Template literals
• Import specific lodash modules instead of entire library

[kevinansfield]

FYI, for anyone working on this there are numerous codemods available to automate a lot of the es6 transformation work. This article is a nice introduction to codemods https://medium.com/airbnb-engineering/turbocharged-javascript-refactoring-with-codemods-b0cae8b326b9

[kirrg001]

FYI: We also have a couple of dependencies, which would need an ES6 update. I am not sure how much ES6 updates are required, but worth double checking.

e.g.

• gscan
• bookshelf-relations
• knex-migrator
• GQL
• Ignition

Let me know if you are interested in helping out there as well 🤠

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Regarding the ES6 updates in Ghost. Dynamic routing was not merged yet and i would love to wait with the ES6 updates till then. As said, i’ll let you know, when you can start with ES6 PR’s for Ghost.