doc: document using domain
in REPL
Document that REPL uses the `domain` module to handle uncaught exceptions, and the side effects caused by it. PR-URL: https://github.com/nodejs/node/pull/20382 Fixes: https://github.com/nodejs/node/issues/19998 Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
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@ -141,6 +141,17 @@ global or scoped variable, the input `fs` will be evaluated on-demand as
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> fs.createReadStream('./some/file');
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```
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#### Global Uncaught Exceptions
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The REPL uses the [`domain`][] module to catch all uncaught exceptions for that
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REPL session.
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This use of the [`domain`][] module in the REPL has these side effects:
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* Uncaught exceptions do not emit the [`'uncaughtException'`][] event.
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* Trying to use [`process.setUncaughtExceptionCaptureCallback()`][] throws
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an [`ERR_DOMAIN_CANNOT_SET_UNCAUGHT_EXCEPTION_CAPTURE`][] error.
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#### Assignment of the `_` (underscore) variable
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<!-- YAML
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changes:
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@ -613,7 +624,11 @@ a `net.Server` and `net.Socket` instance, see:
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For an example of running a REPL instance over [curl(1)][], see:
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[https://gist.github.com/2053342](https://gist.github.com/2053342).
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[`'uncaughtException'`]: process.html#process_event_uncaughtexception
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[`--experimental-repl-await`]: cli.html#cli_experimental_repl_await
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[`ERR_DOMAIN_CANNOT_SET_UNCAUGHT_EXCEPTION_CAPTURE`]: errors.html#errors_err_domain_cannot_set_uncaught_exception_capture
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[`domain`]: domain.html
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[`process.setUncaughtExceptionCaptureCallback()`]: process.html#process_process_setuncaughtexceptioncapturecallback_fn
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[`readline.InterfaceCompleter`]: readline.html#readline_use_of_the_completer_function
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[`readline.Interface`]: readline.html#readline_class_interface
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[`util.inspect()`]: util.html#util_util_inspect_object_options
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