@keplr-ewallet/ewallet-sdk-core/dist/event/index.js

export class EventEmitter2 {
    constructor() {
        this.listeners = {};
        this.listeners = {};
    }
    on(eventName, listener) {
        if (!this.listeners[eventName]) {
            this.listeners[eventName] = [];
        }
        this.listeners[eventName].push(listener);
    }
    emit(eventName, ...args) {
        if (this.listeners[eventName]) {
            this.listeners[eventName].forEach((listener) => listener(...args));
        }
    }
}
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