How to handle transpiled code's source map when passed to ngAnnotate?

[Rush]

So I've ran babel on my code and I get a string with the transpiled code and the inline source map at the end, like so:

//# sourceMappingURL=data:application/json;base64,eyJ2ZXJz.....

Then I run ngAnnotate

let res = ngAnnotate({add: true, map: {inline: true, inFile: "source.js"}}, transpiledCodeWithInlineSourceMap);

I expect to see a source map mapping all the way to the original file but it's not the case? Any tips how to handle it?

[olov]

#245