consider switching to Chromium's source-map implementation
Describe the solution you'd like
@joyeecheung
points out in https://github.com/nodejs/node/pull/31132 that we might do better to pull in Chromium's SourceMap implementation, which seems to have evolved beyond the version pulled into V8.
I suggest that we swap out source_map.js
for this class, when I have the time to port it.