Use source-map-js instead of source-map #449
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Hi,
There is a fork of source-map@0.6 which is 4x times faster and still sync and written in JS only and compatible with Node 6+
More info about fork here: https://github.com/7rulnik/source-map-js#difference-between-original-source-map
This should improve the performance of escodegen without breaking backwards compatibility