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x/aleph/framework/core/events.ts>EventEmitter#prependOnceListener

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method EventEmitter.prototype.prependOnceListener
import { EventEmitter } from "https://deno.land/x/aleph@v0.3.0-beta.7/framework/core/events.ts";

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.

Parameters

eventName: string | symbol
listener: GenericFunction