config to override sourceRoot

[Toxicable]

I have a case where our source maps require using the sourceRoot property to get back to the actual source file for a NodeJS program.
However, we can't compute the sourceRoot at build time, it's only known at runtime.
Would it make sense for source-map to add some config where you can set the sourceRoot source maps being read, either overriding or setting it as the default sourceRoot
This would be used with the downstream lib source-map-support for source maps in stack traces

Related issue: bazel-contrib/rules_nodejs#823 (comment)

[Toxicable]

I don't think this is needed, for our use case anymore.
See microsoft/vscode-chrome-debug-core#549