[lint] turn no-undef back on, set browser, cypress, and mocha env's #5879
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This PR turns the
eslint no-undef
rule back on because it's one of the more dangerous ones to have turned off 😈This resulted in
eslint
complaining about various global variables, such aswindow
(env: browser
),cy
(env: cypress
), anddescribe
(env: mocha
). I added the appropriate.eslintrc
s andenv
entries to setenv
as appropriate, and removedmocha
imports from tests because they are unnecessary.Also fixed ~10 bugs 🐛 from valid
no-undef
errors.@kristw @mistercrunch @michellethomas @graceguo-supercat