Support TSESTree input and TypeScript output

[bjornharrtell]

Motivation

My own motivation is that I have a translation from a typed language (Java) to ESTree and generate JavaScript from that with astring, but would like to preseve some of the type information and target TypeScript instead.

Apparently eslint has made exensions to ESTree called TSESTree but AFAICT they only use it to transform TypeScript into AST not the other way round.

Expected behavior

A flag to output TypeScript.