v4: multilayer storage adapter pattern#12
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Replace the single in-memory store with a composable IStorageAdapter
contract: reads cascade L1 → Ln, hits back-fill missing layers preserving
storedAt, and writes synthesize meta on L1 then propagate to deeper
layers. Adapters are required at construction; clear/delete/isCached
become async; keys() is removed; an optional namespace prefix isolates
instances that share an adapter; Cacheables gains a TMeta generic for
typed sidecar metadata. Ships a built-in MemoryAdapter and refines
read() to return { value } | undefined so adapters can store undefined
values without colliding with the absence signal.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
IStorageAdaptercontract: reads cascade L1 → Ln, hits back-fill missing layers preservingstoredAt, and writes synthesize meta on L1 then propagate to deeper layers using the samestoredAt.adaptersconstructor option; ship a built-inMemoryAdapter; add an optionalnamespaceprefix; expose aTMetageneric for typed sidecar metadata;delete/clear/isCachedbecome async;keys()is removed; any adapter throw rejectsremember()(strict mode).IStorageAdapter.readreturns{ value: T } | undefinedso adapters can storeundefinedvalues without colliding with the absence signal.Test plan
npm run typecheck(root) andnpx tsc --noEmit -p tests/tsconfig.jsonnpm run eslintplus eslint over testsnpm test— 53 tests across 5 suites: cascade behavior, strict error propagation, dedup, namespace, MemoryAdapter, fetchPolicies, index🤖 Generated with Claude Code