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It wouldn't take much to bring this to WASM:

Remember this only generates the LaTeX source. Overleaf does the heavy lifting for rendering.

What could you mean by that? texlive compiles.

The original project only generates LaTeX, it doesn't compile or output.

How does Overleaf compare to Sharelatex?

From what I've seen Sharelatex limits collaborators where as Overleaf limits the file size.