Add feature detects to support Opera mini in extreme data saver mode #186
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Fixes #185.
This PR adds a check for
window.performance
before any reference of theperformance
in the top-level execution stack of any of the main, exported functions. This will ensure that browsers that don't support theperformance
object at all will not error when the methods are called.The PR also removes the usage of
Set
given that Opera mini in extreme data saver mode doesn't support that either.