It fails if gsts isn't on the PATH. It came up within the context of Volta, which manages global installs and calls the tools directly instead of leaving them on the PATH, but could also come up if a user has gsts installed locally in a project and calls ./node_modules/.bin/gsts, instead of having it globally installed.
This is admittedly a very corner case, but with how gsts respawns itself into a headful instance here: https://github.com/ruimarinho/gsts/blob/3d7a1ef28d25b3fe8c442e461b20120e050cace9/index.js#L420
It fails if
gstsisn't on the PATH. It came up within the context of Volta, which manages global installs and calls the tools directly instead of leaving them on the PATH, but could also come up if a user hasgstsinstalled locally in a project and calls./node_modules/.bin/gsts, instead of having it globally installed.