True stream rendering

[dany28]

I'm using Vue to render reports on server side, I need to stream rendered html directly to file or web stream. There is a renderToSimpleStream function, but is not a true stream rendering. First renderer fills array then return each item of array to the stream. Of course I understand this solution is universal for sync and async components

Proposal:
Add option to renderer for user defined function getStream or different version of function renderToSimpleStream which render directly do output stream until data is not Promise