How to pass props using slots from parent to child -vuejs

Question

You need to use a scoped slot. You were almost there, I just added the template that creates the scope.

  <my-parent>
    <template slot-scope="{signal}">
      <my-child :signal="signal"></my-child>
      <my-child :signal="signal"></my-child>
    </template>
  </my-parent>

Here is your code updated.

const MyParent = Vue.component('my-parent', {
  template: `<div>
               <h3>Parent's Children:</h3>
               <slot :signal="parentVal"></slot>
             </div>`,

  data: function() {
    return {
      parentVal: 'value of parent'
    }
  }
});


const MyChild = Vue.component('my-child', {
  template: '<h3>Showing child {{signal}}</h3>',
  props: ['signal']
});

new Vue({
  el: '#app',
  components: {
    MyParent,
    MyChild
  }
})

<script src="https://unpkg.com/vue/dist/vue.js"></script>

<div id="app">
  <my-parent>
    <template slot-scope="{signal}">
      <my-child :signal="signal"></my-child>
      <my-child :signal="signal"></my-child>
    </template>
  </my-parent>
</div>

The release of Vue 2.6 introduces a unified v-slot directive which can be used for normal or scoped slots. In this case, since you’re using the default, unnamed slot, the signal property can be accessed via v-slot="{ signal }":

  <my-parent>
    <template v-slot="{ signal }">
      <my-child :signal="signal"></my-child>
      <my-child :signal="signal"></my-child>
    </template>
  </my-parent>

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