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require('emitter-listener');\n\nvar ee = new EventEmitter();\n\nvar id = 0;\n\nwrapEmitter(\n ee,\n function mark(listener) {\n listener.id = id++;\n },\n function prepare(listener) {\n console.log('listener id is %d', listener.id);\n }\n);\n```\n\n### Mandatory disclaimer\n\nThere are times when it's necessary to monkeypatch default behavior in\nJavaScript and Node. However, changing the behavior of the runtime on the fly\nis rarely a good idea, and you should be using this module because you need to,\nnot because it seems like fun.\n\n#### wrapEmitter(emitter, mark, prepare)\n\nWrap an EventEmitter's event listeners. Each listener will be passed to\n`mark` when it is registered with `.addListener()` or `.on()`, and then\neach listener is passed to `prepare` to be wrapped before it's called\nby the `.emit()` call. `wrapListener` deals with the single listener\nvs array of listeners logic, and also ensures that edge cases like\n`.removeListener()` being called from within an `.emit()` for the same\nevent type is handled properly.\n\nThe wrapped EE can be restored to its pristine state by using\nemitter.__unwrap(), but this should only be used if you *really* know\nwhat you're doing.", "_attachments": {} }