@toast-ui/chart/dist/esm/eventEmitter.js

TOAST UI Application: Chart

export default class EventEmitter {
    constructor() {
        this.handlers = [];
    }
    on(type, handler) {
        if (!this.handlers[type]) {
            this.handlers[type] = [];
        }
        this.handlers[type].push(handler);
    }
    emit(type, ...args) {
        if (this.handlers[type]) {
            this.handlers[type].forEach((handler) => handler(...args));
        }
    }
}