pelican-dev/panel

// ...

if (!function_exists('convert_bytes_to_readable')) {
    function convert_bytes_to_readable(int $bytes, int $decimals = 2, ?int $base = null): string
    {
        $conversionUnit = config('panel.use_binary_prefix') ? 1024 : 1000;
        $suffix = config('panel.use_binary_prefix') ? ['Bytes', 'KiB', 'MiB', 'GiB', 'TiB'] : ['Bytes', 'KB', 'MB', 'GB', 'TB'];

        if ($bytes <= 0) {
            return '0 ' . $suffix[0];
        }

        $fromBase = log($bytes) / log($conversionUnit);
        $base ??= floor($fromBase);

        return Number::format(pow($conversionUnit, $fromBase - $base), $decimals, locale: auth()->user()->language) . ' ' . $suffix[$base];
    }
}

// ...

{
    // ...
    "autoload": {
        "files": [
            "app/helpers.php"
        ],
        "psr-4": {
            "App\\": "app/",
            "Database\\Factories\\": "database/Factories/",
            "Database\\Seeders\\": "database/Seeders/"
        }
    },
    // ...
}

class NodeStorageChart extends ChartWidget
{
    // ...

    public function getHeading(): string
    {
        $used = convert_bytes_to_readable($this->node->statistics()['disk_used']);
        $total = convert_bytes_to_readable($this->node->statistics()['disk_total']);

        return trans('admin/node.disk_chart', ['used' => $used, 'total' => $total]);
    }
}