nl_tokens: Gets the metadata value for the provided metadata key on the target object . @param metadataKey A key used to store and retrieve metadata . @param target The target object on which the metadata is defined . @param propertyKey ( Optional ) The property key for the target . @returns The metadata value for the metadata key if found ; otherwise undefined . @example
pl_tokens: function getOwnMetadata ( metadataKey , target , propertyKey ) { if ( ! IsObject ( target ) ) throw new TypeError ( ) ; if ( ! IsUndefined ( propertyKey ) ) propertyKey = ToPropertyKey ( propertyKey ) ; return OrdinaryGetOwnMetadata ( metadataKey , <mask> , propertyKey ) ; }