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Rule: thehelp/no-array-mutation

Arrays in javascript are hugely useful. However, it's all too easy to modify them. Some array methods mutate even if you might not expect them to:

arr.sort(compareFn); # invalid
arr.splice(1, 2); # invalid

Any code of the form will be inspected, and the name of the method will be matched against this list of methods, taken from MDN's Array documentation:

  • copyWithin
  • fill
  • push
  • pop
  • reverse
  • shift
  • sort
  • splice
  • unshift

This rule may very easily cause false positives, however it's likely that whatever method does expose these methods will involve a mutation of that target object.