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Regarding technical decisions behind ScandiPWA
When developing extensions and theme overrides, developers are free to choose any technology they wish, including TypeScript.
ScandiPWA uses the default Magento 2 cache control mechanism over the
AddTagsToResponsePluginto add entity headers to each GraphQL cacheable response.
A custom Cache entity (singleton) is used to gather all entities that were loaded during current request. Flushing happens on the default
cache_flushevents for most entities. CMS has its own event observers to track response/flush.