Reduce memory overhead of sourcemapLocations #169
Merged
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It was using an object to store positions in the string. This meant that those offsets were first stringified and then added as object properties. For a 200K JS code file (as parsed by rollup), the
sourcemapLocations
object was taking up 980K. Switching it to aBitSet
(contribution by @kzc) that uses one bit per offset makes it take up 36K instead.Fixes #167