Create user context for the JavaScript SDK v6+

// Option 1 - Create a user, then set attributes.
const user = optimizely.createUserContext('user123');
user.setAttribute('is_logged_in', false);
user.setAttribute('app_version', '1.3.2');

// Option 2 – Pass attributes when creating the user.
const attributes = {
  is_logged_in: false,
  app_version: '1.3.2'
}

const user = optimizely.createUserContext('user123', attributes);

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;

    // Same as decide except it returns a promise
    decideAsync(
      key: string,
      options?: OptimizelyDecideOption[]
    ): Promise<OptimizelyDecision>;

    // make decisions about which flag variations the user buckets into for flag keys
    decideForKeys(
      keys: string[],
      options: OptimizelyDecideOption[] = [],
    ): { [key: string]: OptimizelyDecision };
  
		// Same as decideForKeys except it returns a promise.
    decideForKeysAsync(
      keys: string[],
      options?: OptimizelyDecideOption[]
    ): Promise<Record<string, OptimizelyDecision>>;

    // make decisions about which flag variations the user buckets into for all flags
    decideAll(
      options: OptimizelyDecideOption[] = []
    ): { [key: string]: OptimizelyDecision };
  
		// Same as decideAll except it returns promise.
    decideAllAsync(
      options?: OptimizelyDecideOption[]
    ): Promise<Record<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;
  
    //
    // The following methods require Real-Time Audiences for Feature Experimentation. 
    // See note following this code sample. 
    //

    // An array of segment names that the user is qualified for. 
    // The result of **fetchQualifiedSegments()** is saved here. 
    // Can be null if not properly updated with fetchQualifiedSegments(). 
    // 
    //  You can read and write directly to the qualified audience segments array. 
    //  This lets you bypass the remote fetching process from ODP 
    //  or use your own fetching service.   
    qualifiedSegments: string[] = [];

    // Fetch all qualified segments for the user context. 
    //
    // The segments fetched are saved in **qualifiedSegments** and can be accessed any time.
    // On failure, **qualifiedSegments** is null and one of the following errors are returned:
    // - OptimizelyError.invalidSegmentIdentifier
    // - OptimizelyError.fetchSegmentsFailed(String)
    //
    // - Parameters:
    //   - options: (Optional) A set of options for fetching qualified segments.
    // - Returns: A Promise that resolves to true if segments were fetched successfully.
    fetchQualifiedSegments(options?: string[]): Promise<boolean>;
  
    //  Check if the user qualified for the given segment. 
    // - Parameter segment: The segment name to check qualification for.
    // - Returns: true, if qualified.
    isQualifiedFor(segment)
}