default.prependOnceListener method | Node.js events module | Bun

default.prependOnceListener method | Node.js events module | BunBuildDocsReferenceGuidesBlogDiscord/node:events/default/prependOnceListenerMprependOnceListener

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BuildDocsReferenceGuidesBlogDiscord/node:events/default/prependOnceListenerMprependOnceListener

method

events.default.prependOnceListener { console.log('Ah, we have our first user!'); }); ``` Returns a reference to the `EventEmitter`, so that calls can be chained." data-algolia-static="false" data-algolia-merged="false" data-type="Method">prependOnceListenerE extends string | symbol>(eventName: IfEventMapT, unknown | unknown | E>,listener: IfEventMapT, (...args: E extends keyof T ? T[EE>] : E extends keyof EventEmitterEventMap ? EventEmitterEventMap[EE>] : any[]) => void>): this;

Adds a one-time listener function for the event named eventName to the beginning of the listeners array. The next time eventName is triggered, this listener is removed, and then invoked.

server.prependOnceListener('connection', (stream) => {
console.log('Ah, we have our first user!');
});

Returns a reference to the EventEmitter, so that calls can be chained.

@param eventName

The name of the event.

@param listener

The callback function

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