framework/RedKiteCms/Content/BlockManager/BlockManager.php
protected function getSlotDefinition($dir)
    {
        $slotsFilename = $this->getSlotDefinitionFile($dir);

        return json_decode(FilesystemTools::readFile($slotsFilename), true);
    }
protected function getSlotDefinition($dir)
    {
        $slotsFilename = $this->getSlotDefinitionFile($dir);

        return json_decode(FilesystemTools::readFile($slotsFilename), true);
    }
Fetches the slot definition

@param string $dir

@return array