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GrowthBook Users

What sort of caching do the javascript based SDKS do?

There is a section called <https://docs.growthbook.io/lib/js#built-in-fetching-and-caching|Built-in Fetching and Caching>, but no information about how the caching actually works.

Out of the box, built in caching will include:
a. In memory cache, which avoids extra lookups within a given SDK session
b. window.localStorage, to persist cache across browser sessions

If you are using the SDK in a backend context, you can provide your own polyfill for localStorage and route it to use a cache system of your choosing.

Specific cache strategy uses a stale-while-revalidate approach, with the default stale timeout being 60 seconds. You can override this using SDK's exported function `configureCache`
```const { configureCache } = require("@growthbook/growthbook");

// after SDK is initialized, optional fields:
configureCache({
  backgroundSync: true;
  cacheKey: "somethingElse";
  staleTTL: 3600;
})```