@inweb/eventemitter2/dist/eventemitter2.module.js

JavaScript event emitter

class EventEmitter2 {
    constructor() {
        this._listeners = {};
    }
    addEventListener(type, listener) {
        if (this._listeners[type] === undefined) this._listeners[type] = [];
        this._listeners[type].push(listener);
        return this;
    }
    removeEventListener(type, listener) {
        if (this._listeners[type] === undefined) return this;
        const listeners = this._listeners[type].filter((x => x !== listener));
        if (listeners.length !== 0) this._listeners[type] = listeners; else delete this._listeners[type];
        return this;
    }
    removeAllListeners(type) {
        if (type) delete this._listeners[type]; else this._listeners = {};
        return this;
    }
    emitEvent(event) {
        if (this._listeners[event.type] === undefined) return false;
        const invoke = this._listeners[event.type].slice();
        invoke.forEach((listener => listener.call(this, event)));
        return true;
    }
    on(type, listener) {
        return this.addEventListener(type, listener);
    }
    off(type, listener) {
        return this.removeEventListener(type, listener);
    }
    emit(type, ...args) {
        if (typeof type === "string") return this.emitEvent({
            type: type,
            args: args
        }); else if (typeof type === "object") return this.emitEvent(type); else return false;
    }
}

export { EventEmitter2 };
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