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Much of the Node.js core API is built around an idiomatic asynchronous event-driven architecture. [S1]

Emitters

All objects that emit events are instances of the EventEmitter class. [S1]

Streams are emitters

All streams are instances of EventEmitter. [S2]

A stream is an abstract interface for working with streaming data in Node.js. [S2]

Claims

• id: C1 claim: Core APIs are event-driven. source: S1 evidence: "Much of the Node.js core API is built around an idiomatic asynchronous event-driven architecture"

• id: C2 claim: Emitters are EventEmitter instances. source: S1 evidence: "All objects that emit events are instances of the EventEmitter class."

• id: C3 claim: Streams are EventEmitters. source: S2 evidence: "All streams are instances of EventEmitter."

• id: C4 claim: Streams abstract streaming data. source: S2 evidence: "A stream is an abstract interface for working with streaming data in Node.js."

Sources

• [S1] Events. Node.js. https://nodejs.org/api/events.html . License: MIT. Accessed 2026-11-06.

• [S2] Stream. Node.js. https://nodejs.org/api/stream.html . License: MIT. Accessed 2026-11-06.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted). Copyright Node.js contributors. MIT (https://github.com/nodejs/node/blob/main/LICENSE).

@misc{iil_note_dejjkcb2,
  author = {{iinventedlight}},
  title = {{EventEmitter and the events module}},
  howpublished = {iinventedlight Library},
  year = {2026},
  date = {2026-11-06},
  url = {https://iinventedlight.com/library/notes/node-events/},
  note = {Permanent ID iil:note:dejjkcb2. License: CC-BY-4.0.},
}

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