@cimo/jsmvcfw/dist/src/JsMvcFwEmitter.js

Javascript mvc framework. Light, fast and secure.

export default class Emitter {
    listenerObject = {};
    on(event, listener) {
        if (!this.listenerObject[event]) {
            this.listenerObject[event] = [];
        }
        if (this.listenerObject[event]) {
            this.listenerObject[event].push(listener);
        }
    }
    emit(event, ...[payload]) {
        const listenerEventList = this.listenerObject[event];
        if (listenerEventList) {
            for (const listener of listenerEventList) {
                listener(payload);
            }
        }
    }
    off(event, listener, isRemoveAll = false) {
        const listenerEventList = this.listenerObject[event];
        if (listenerEventList) {
            if (isRemoveAll) {
                for (let a = listenerEventList.length - 1; a >= 0; a--) {
                    if (listenerEventList[a] === listener) {
                        listenerEventList.splice(a, 1);
                    }
                }
            }
            else {
                const index = listenerEventList.indexOf(listener);
                if (index !== -1) {
                    listenerEventList.splice(index, 1);
                }
            }
        }
    }
}
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