system/Router/RouteCollection.php
protected function discoverRoutes()
	{
		if ($this->didDiscover)
		{
			return;
		}

		// We need this var in local scope
		// so route files can access it.
		$routes = $this;

		if ($this->moduleConfig->shouldDiscover('routes'))
		{
			$files = $this->fileLocator->search('Config/Routes.php');

			foreach ($files as $file)
			{
				// Don't include our main file again...
				if ($file === APPPATH . 'Config/Routes.php')
				{
					continue;
				}

				include $file;
			}
		}

		$this->didDiscover = true;
	}
protected function discoverRoutes()
	{
		if ($this->didDiscover)
		{
			return;
		}

		// We need this var in local scope
		// so route files can access it.
		$routes = $this;

		if ($this->moduleConfig->shouldDiscover('routes'))
		{
			$files = $this->fileLocator->search('Config/Routes.php');

			foreach ($files as $file)
			{
				// Don't include our main file again...
				if ($file === APPPATH . 'Config/Routes.php')
				{
					continue;
				}

				include $file;
			}
		}

		$this->didDiscover = true;
	}
Will attempt to discover any additional routes, either through
the local PSR4 namespaces, or through selected Composer packages.