src/Theme/Finder.php
public function detect(): Collection
    {
        $path = \rtrim($this->publicPath, '/').'/themes/';

        return Collection::make($this->files->directories($path))->mapWithKeys(function ($folder) {
            return [
                $this->parseThemeNameFromPath($folder) => new Manifest($this->files, \rtrim($folder, '/').'/'),
            ];
        });
    }
public function detect(): Collection
    {
        $path = \rtrim($this->publicPath, '/').'/themes/';

        return Collection::make($this->files->directories($path))->mapWithKeys(function ($folder) {
            return [
                $this->parseThemeNameFromPath($folder) => new Manifest($this->files, \rtrim($folder, '/').'/'),
            ];
        });
    }
Detect available themes.

@throws \RuntimeException

@return \Illuminate\Support\Collection