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doc: readline 'line' event emits final line
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Updated docs to reflect current behaviour of readline:
final line of input will be emitted via `'line'` event
when input stream `'end'` event is emitted even when
the input is not newline terminated.

Refs: nodejs/node-v0.x-archive#7238

PR-URL: #42214
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
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mattpr authored and danielleadams committed Apr 24, 2022
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Expand Up @@ -82,6 +82,9 @@ The `'line'` event is emitted whenever the `input` stream receives an
end-of-line input (`\n`, `\r`, or `\r\n`). This usually occurs when the user
presses <kbd>Enter</kbd> or <kbd>Return</kbd>.

The `'line'` event is also emitted if new data has been read from a stream and
that stream ends without a final end-of-line marker.

The listener function is called with a string containing the single line of
received input.

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