options.GofumptFormat = func(ctx context.Context, src []byte) ([]byte, error) {
        return format.Source(src, format.Options{
            // TODO: fill LangVersion and ModulePath from the current go.mod.
            // The information is availabe as loaded by go/packages via the
            // Module type, but it needs to be wired up all the way here.
            // We likely want to change the GofumptFormat field type to take
            // extra parameters, to then be used in format.Options.
            // See https://pkg.go.dev/mvdan.cc/gofumpt@v0.3.0/format#Options.
        })
    }