Enables source maps for the typescript compilation. The tangible benefit this will currently provide is that test errors will be reported in terms of the typescript line number instead of the javascript line number.

In future we might be able to get typescript line numbers in production error stack traces too, but currently I can't find a way to pass the --enable-source-maps option to nodejs and the actions team have confirmed this isn't currently possible.

Merge / deployment checklist

• Run test builds as necessary. Can be on this repository or elsewhere as needed in order to test the change - please include links to tests in other repos!
  • CodeQL using init/analyze actions
  • 3rd party tool using upload action
• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.