mixins emitter.js

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  function broadcast(componentName, eventName, params) {
  this.$children.forEach(child => {
    const name = child.$options.componentName;
 
    if (name === componentName) {
      child.$emit(...[eventName].concat(params));
    } else {
      broadcast.apply(child, [componentName, eventName].concat([params]));
    }
  });
}
 
export default {
  methods: {
    dispatch(componentName, eventName, params) {
      let parent = this.$parent || this.$root;
      let name = parent.$options.componentName;
 
      while (parent && (!name || name !== componentName)) {
        parent = parent.$parent;
 
        if (parent) {
          name = parent.$options.componentName;
        }
      }
      if (parent) {
        parent.$emit(...[eventName].concat(params));
      }
    },
 
    broadcast(componentName, eventName, params) {
      broadcast.call(this, componentName, eventName, params);
    }
  }
};