[CS2] use _extends utility instead of Object.assign() for object spreads #4675
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See #4674
This replaces the direct calls to
Object.assign()
currently generated by object spreads with a call to a new utility function_extends
(directly copied from Babel's equivalent, defaults to usingObject.assign
when it's supported)Added
eqJS()
test that_extends
is being generated and used when compiling object spread