text: declare module 'mixpanel-browser' {
    declare type People = {
      set(prop: Object|String, to?: any, callback?: Function): void;
      set_once(prop: Object|String, to?: any, callback?: Function): void;
      increment(prop: Object|string, by?: number, callback?: Function): void;
      append(prop: Object|string, value?: any, callback?: Function): void;
      union(prop: Object|string, value?: any, callback?: Function): void;
      track_charge(amount: number, properties?: Object, callback?: Function): void;
      clear_charges(callback?: Function): void;
      delete_user(): void;
    }
  
    declare type MixpanelBrowser = {
      init(token: string, config?: Object, name?: string): void;
      push(item: [string, Object]): void;
      disable(events?: string[]): void;
      track(event_name: string, properties?: Object, callback?: Function): void;
      track_links(query: Object|string, event_name: string, properties?: Object|Function): void;
      track_forms(query: Object|string, event_name: string, properties?: Object|Function): void;
      time_event(event_name: string): void;
      register(properties: Object, days?: number): void;
      register_once(properties: Object, default_value?: any, days?: number): void;
      unregister(property: string): void;
      identify(unique_id: string): void;
      reset(): void;
      get_distinct_id(): string;
      alias(alias: string, original?: string): void;
      set_config(config: Object): void;
      get_config(): Object;
      people: People;
    }
  
    declare module.exports: MixpanelBrowser;
  }
  