An empty database in everybody's pocket
summary
IndexedDB is presented as a practical way to add performance and resiliency to single page apps by keeping a local object store of messages. A small chat called Twill emoji uses Twilio Programmable Chat, opens a database with an object store named messages, uses a keyPath Sid and cursor iteration to put and read items, and renders stored messages immediately so messages load instantly from IndexedDB even when the network is slow. Notes include upgrade/version transactions, indexes, Safari bugs, and libraries like idb localForage and pouchDB.
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