[Home](./index.md) > [@snowplow/node-tracker](./node-tracker.md) > [Emitter](./node-tracker.emitter.md) ## Emitter interface Emitter is responsible for sending events to the collector. It manages the event queue and sends events in batches depending on configuration. Signature: ```typescript interface Emitter ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [flush](./node-tracker.emitter.flush.md) | () => Promise<void> | Forces the emitter to send all events in the event store to the collector. | | [input](./node-tracker.emitter.input.md) | (payload: Payload) => Promise<void> | Adds a payload to the event store or sends it to the collector. | | [setAnonymousTracking](./node-tracker.emitter.setanonymoustracking.md) | (anonymous: boolean) => void | Sets the server anonymization flag. | | [setBufferSize](./node-tracker.emitter.setbuffersize.md) | (bufferSize: number) => void | Updates the buffer size of the emitter. | | [setCollectorUrl](./node-tracker.emitter.setcollectorurl.md) | (url: string) => void | Updates the collector URL to which events will be sent. |