update rollup to 0.34.8, to avoid parsing slowdown #9509
Merged
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See #9310 (comment) – this was tracked down to rollup/rollup#774, which is now merged.
This doesn't address the fact that UglifyJS will remove the parens enclosing the factory function – some clues here, though for whatever reason I haven't yet managed to disable
negate_iife
– so while the unminified build now parses faster, the minified build is currently still affected.