What is the problem this feature will solve?

Projects which include multiple files or non-javascript files would benefit from it and would not have to bundle everything.

What is the feature you are proposing to solve the problem?

Support injecting multiple files, since right now its limited to inject a single file as per here.

What alternatives have you considered?

Bundling

Please add the single-executables label to it or suggest a better place to file this feature request.