style(lib/checks): var -> let and const codemod #4451
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Who else does this? - Google (JS style guide) https://google.github.io/styleguide/jsguide.html#features-local-variable-declarations - Airbnb (popular JS style guide) https://github.com/airbnb/javascript Why do this? Gaiety's explanation: "`let` works the way most devs think `var` works. scope leaking and variable hoisting is a messy confusing idea, JS got updated for a reason" also it's 2024, this isn't too controversial anymore - https://www.freecodecamp.org/news/var-let-and-const-whats-the-difference/ - https://blog.javascripttoday.com/blog/var-vs-let-vs-const/ "The var keyword was originally used for declaring variables in JavaScript. If you’ve browsed an old codebase or an older JavaScript tutorial, you have probably seen it." - https://medium.com/@rithinmenezes/understanding-let-var-and-const-in-javascript-a-guide-to-variable-declarations-f271c5b8dc79 - Airbnb's why https://airbnb.io/javascript/#variables
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This is a piece of a larger creative time PR so it's easier to review, the full scope can be seen here and includes eslint adjustments not seen here #4444
Who else does this?
Why do this?
Gaiety's explanation: "
letworks the way most devs thinkvarworks. scope leaking and variable hoisting is a messy confusing idea, JS got updated for a reason" also it's 2024, this isn't too controversial anymore