No it's not.
The file searching code is in Rust (IIRC) and runs as an external process, but that is about it.
Re:Electron 4.0.0
by InGodsName on Friday December 21, 2018 @01:31PM
(#18735376)
So eletrons lets you code part of it in C++?
Re:Electron 4.0.0
by fabiospampinato on Friday December 21, 2018 @02:06PM
(#18735664)
You can have native modules in Node.js, and you can use Node.js inside Electron.
Because, you know, Microsoft.