nl_tokens: The EventStream type wraps window . EventSource to listen to the unified per - user event channel endpoint using the SSE protocol . When events are received on the SSE channel this triggers a Backbone event of the form g : event . <type > where <type > is the value of the event type field . Listeners can bind to specific event types on the channel .
pl_tokens: function EventStream ( <mask> ) { const defaults = { timeout : null , streamPath : '/notification/stream' } ; // User-provided settings from initialization this . settings = _ . extend ( defaults , settings ) ; // Possible states are 'closed', 'stopped', 'started' this . _state = 'closed' ; // Whether this is started (if so, holds the EventSource instance) this . _eventSource = null ; // Create context bindings only once, so they can be referenced when unbinding events this . _onVisibilityStateChange = _ . bind ( this . _onVisibilityStateChange , this ) ; this . _onMessage = _ . bind ( this . _onMessage , this ) ; this . _onError = _ . bind ( this . _onError , this ) ; return _ . extend ( this , Backbone . Events ) ; }