Electron now uses GN to build itself. Here's a discussion of why.
When Electron was first released in 2013, Chromium's build configuration was written with GYP, short for "Generate Your Projects".
Electron has historically kept a separation between the main Electron code and libchromiumcontent, the part of Electron that wraps Chromium's 'content' submodule. Electron has carried on using GYP, while libchromiumcontent -- as a subset of Chromium -- switched to GN when Chromium did.
Like gears that don't quite mesh, there was friction between using the two build systems. Maintaining compatibility was error-prone, from compiler flags and
#defines that needed to be meticulously kept in sync between Chromium, Node, V8, and Electron.
To address this, the Electron team has been working on moving everything to GN. Today, the commit to remove the last of the GYP code from Electron was landed in master.
If you're contributing to Electron itself, the process of checking out and building Electron from
master or 4.0.0 is very different than it was in 3.0.0 and earlier. See the GN build instructions for details.
If you're developing an app with Electron, there are a few minor changes you might notice in the new Electron 4.0.0-nightly; but more than likely, Electron's change in build system will be totally transparent to you.
GN is faster than GYP and its files are more readable and maintainable. Moreover, we hope that using a single build configuration system will reduce the work required to upgrade Electron to new versions of Chromium.
It's already helped development on Electron 4.0.0 substantially because Chromium 67 removed support for MSVC and switched to building with Clang on Windows. With the GN build, we inherit all the compiler commands from Chromium directly, so we got the Clang build on Windows for free!