OptimizelyUserContext for the JavaScript (Node) SDK

interface OptimizelyUserContext {
    // set an attribute for the user
    setAttribute(key: string, value: unknown): void;

    // return user attributes
    getAttributes(): UserAttributes;

    // make a decision about which flag variation the user buckets into for the flag key 
    decide(
      key: string,
      options: OptimizelyDecideOption[] = []
      ): OptimizelyDecision;

    // make decisions about which flag variations the user buckets into for flag keys
    decideForKeys(
      keys: string[],
      options: OptimizelyDecideOption[] = [],
      ): { [key: string]: OptimizelyDecision };

    // make decisions about which flag variations the user buckets into for all flags
    decideAll(
      options: OptimizelyDecideOption[] = []
      ): { [key: string]: OptimizelyDecision };

    // track user event
    trackEvent(eventName: string, eventTags?: EventTags): void;
    
    // Sets the forced decision (variationKey) for a given decision context
    setForcedDecision(context: OptimizelyDecisionContext, decision: OptimizelyForcedDecision): boolean;

    // Returns the forced decision for a given decision context
    getForcedDecision(context: OptimizelyDecisionContext): OptimizelyForcedDecision | null;

    // Removes the forced decision for a given decision context
    removeForcedDecision(context: OptimizelyDecisionContext): boolean;

    // Removes all forced decisions bound to this user context
    removeAllForcedDecisions(): boolean;
}