property EventEmitter.defaultMaxListeners
Usage in Deno
```typescript import { EventEmitter } from "node:node__events.d.ts"; ```By default, a maximum of `10` listeners can be registered for any single
event. This limit can be changed for individual `EventEmitter` instances
using the `emitter.setMaxListeners(n)` method. To change the default
for _all_`EventEmitter` instances, the `events.defaultMaxListeners` property
can be used. If this value is not a positive number, a `RangeError` is thrown.
Take caution when setting the `events.defaultMaxListeners` because the
change affects _all_ `EventEmitter` instances, including those created before
the change is made. However, calling `emitter.setMaxListeners(n)` still has
precedence over `events.defaultMaxListeners`.
This is not a hard limit. The `EventEmitter` instance will allow
more listeners to be added but will output a trace warning to stderr indicating
that a "possible EventEmitter memory leak" has been detected. For any single
`EventEmitter`, the `emitter.getMaxListeners()` and `emitter.setMaxListeners()` methods can be used to
temporarily avoid this warning:
```js
import { EventEmitter } from 'node:events';
const emitter = new EventEmitter();
emitter.setMaxListeners(emitter.getMaxListeners() + 1);
emitter.once('event', () => {
// do stuff
emitter.setMaxListeners(Math.max(emitter.getMaxListeners() - 1, 0));
});
```
The `--trace-warnings` command-line flag can be used to display the
stack trace for such warnings.
The emitted warning can be inspected with `process.on('warning')` and will
have the additional `emitter`, `type`, and `count` properties, referring to
the event emitter instance, the event's name and the number of attached
listeners, respectively.
Its `name` property is set to `'MaxListenersExceededWarning'`.
number