Overhead code generation for `outFile`

[pankleks]

I'm compiling my project to single output file using outFile option.

TSC is generating overhead code as such:

This happens for every file of my solution -> in my case hundreds of small files which cause significant overhead in output file.

I believe this could be optimized by merging objects in same namespace.

Test solution:
testmerge.zip

TSC v: 3.1.1 but I believe it was like this since very beginning.

[ajafff]

This is actually really difficult because each namespace can have local declarations (variables, functions, ...). These names would need to be rewritten to avoid collisions. After all I don't think it's worth the effort.
You could try some minifiers on the generated file to get rid of the duplicate code.

[RyanCavanaugh]

Duplicate #447