Cannot add or modify JSDoc with custom transformers

[kimamula]

TypeScript Version: 2.3.2

It is likely that TypeScript basically emits comments as they were in the original TypeScript code and any mutation of ts.JSDoc objects with custom transformers is ignored.

Though it is possible to add comments by ts.addSyntheticLeadingComment() or ts.addSyntheticTrailingComment(), they cannot be used to add JSDoc style comments.

Is it possible to enable adding or modifying JSDoc with custom transformers?
This feature would be helpful for solving the problem like #10, for example.

[RyanCavanaugh]

Will track at #17146