Use source-map-js (source-map's fork) #1515
Merged
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I made the fork from source-map and named it source-map-js. It contains several performance optimizations. Now source-map consumer should be 4x faster.
PR with optimizations: 7rulnik/source-map-js#2
Reasons and difference of fork: https://github.com/7rulnik/source-map#difference-between-original-source-map