Queries information about the overall state of the store.
The resolved value of the Promise should always be a BigSegmentStoreMetadata object.
If the store is accessible but contains no metadata, the object's lastUpToDate property can
be undefined. If the store is not accessible due to a database error, the method can throw an
exception/reject the promise.
This method will be called only when the SDK needs the latest state, so it should not be cached.
a Promise for the result of the query
Queries the store for a snapshot of the current segment state for a specific user.
The userHash is a base64-encoded string produced by hashing the user key as defined by the Big Segments specification; the store implementation does not need to know the details of how this is done, because it deals only with already-hashed keys, but the string can be assumed to only contain characters that are valid in base64.
The resolved value of the Promise should be either a BigSegmentStoreMembership, or undefined if the user is not referenced in any Big Segments (this is equivalent to a BigSegmentStoreMembership that has no properties).
identifies the user
a Promise for the result of the query.
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A read-only data store that allows querying of user membership in Big Segments.
Big Segments are a specific type of user segments. For more information, read the LaunchDarkly documentation: https://docs.launchdarkly.com/home/users/big-segments