New transform: for loops to `for of`

Convert this

for (var i = 0; i < fruits.length; i++) {
   console.log(fruits[i]);
}

to this

for (let fruit of fruits) {
  console.log(fruit)
}

[nene]

This is now released as v2.2.0

[nene]

@siddharthkp I think that’s my general opinion as well. One really shouldn’t use Lebab blindly - the changes need some human review.

Then again, Lebab should not do changes that might break stuff. Ideally when reviewing the transformed code you would not need to fix any actual bugs, but more like manually transform the cases that Lebab didn’t handle or adjust the code style when Lebab didn’t format the code to the best of your preferences.

In that regard some transforms are very safe, like obj-shorthand. Some can currently fail with rare edge-cases, like arrow, while the goal is to fix these bugs. But some transforms don’t guarantee strictly equivalent code - like the default arguments aren’t really equivalent to a = a || 3 - I’ve classified those to the “Unsafe” category. The latter ones can’t really be implemented in a way that would make the transform perfectly safe, but they work fine for most of the code.