public CalculatedCacheContextInterface::getCacheableMetadata($parameter = NULL)
Gets the cacheability metadata for the context based on the parameter value.
There are three valid cases for the returned CacheableMetadata object:
string|null $parameter: The parameter, or NULL to indicate all possible parameter values.
\Drupal\Core\Cache\CacheableMetadata A cacheable metadata object.
\LogicException Thrown if the passed in parameter is invalid.
public function getCacheableMetadata($parameter = NULL);
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