How do I start writing a transpiler? Is it even possible?

Question

Due to confidentiality reasons, I might not be able to describe in pin point details but here is the scenario.

Various devices that have streaming apps have differen

Answer 1

Yes, this is possible, and compilers are often written this way.

The general idea is to create an "intermediate language", then write several one-way translators:

  C#           => intermediate
  JavaScript   => intermediate

  intermediate => C#
  intermediate => JavaScript

Putting the output from one, into the next, you can translate from one language to another:

  C#          =>  intermediate =>  JavaScript
  JavaScript  =>  intermediate =>  C#

Unfortunately the code generated will probably not be human-friendly.