Gio.File.prototype.measure_disk_usage_finish

function measure_disk_usage_finish(result: Gio.AsyncResult): [ok: Boolean, disk_usage: Number(guint64), num_dirs: Number(guint64), num_files: Number(guint64)] {
    // Gjs wrapper for g_file_measure_disk_usage_finish()
}

Collects the results from an earlier call to Gio.File.measure_disk_usage_async. See Gio.File.measure_disk_usage for more information.

Since 2.38

result: the Gio.AsyncResult passed to your Gio.AsyncReadyCallback
ok: true if successful, with the out parameters set. false otherwise, with @error set.
disk_usage: the number of bytes of disk space used
num_dirs: the number of directories encountered
num_files: the number of non-directories encountered