OptionalcancellationToken: CancellationTokenOptionaltokenUsageService: TokenUsageServiceOptionalmodel: stringProtecteddoneProtected ReadonlymessageProtected Optional ReadonlymodelProtected ReadonlyrequestProtected ReadonlyrequestProtected ReadonlystreamProtectedterminalProtected ReadonlytoProtected Optional ReadonlytokenProtectedhandleNOTE: 'next' is defined using a tuple to ensure we report the correct assignability errors in all places.
Protectedregister
Dispose this object.