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In my case, the build generated by webpack contained two references to
sourceMappingURL
that matched the existing regex.The first one was in the middle of the minified script, looked something like
... 10)+1,l=R.substring(V)+(B?"//# sourceMappingURL="+B:""),J=new Blob([l],{type:"application/javascript"});...
The second one was the expected one at the very end of the file.
getSourceMap
stopped at the first match, so ended up not finding the correct one.Matching for a preceding newline before the
//# sourceMappingURL
comment resolves this, as it finds the correct comment and I get proper coverage reports now.An alternative approach / further improvement would be to use a global match, eg.