In short
Node's built-in pattern for building objects that emit named events other code can listen for — the mechanism underlying HTTP servers, streams, and much of Node's core API.
How to learn this
- 1Build a simple custom class extending `EventEmitter` that emits a custom event.
- 2Learn `.on()`, `.once()` and `.emit()`.
- 3Recognize that Node's `http.Server` and streams are themselves EventEmitters.
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