Vue.js is throwing an error because it cannot find the property or method "blah" when referencing it during rendering

Can you explain why Vue 2 throws an error indicating that a prop is not defined, even though it is statically defined in the parent template?

Note: This error does not occur when I include the JavaScript code within the .vue file's script tag instead of importing it.

Error Message:

The property or method "embedded" is referenced during render but is not defined on the instance. Ensure that this property is reactive by initializing it either in the data option or for class-based components. For more information, see https://v2.vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.

loader.html

<div class="overlay">
  <div class="loader" v-bind:class="{ embedded }">
    <div class="loader__items">
      <div class="loader__item"></div>
      <div class="loader__item"></div>
      <div class="loader__item"></div>
      <div class="loader__item"></div>
      <div class="loader__item"></div>
    </div>
  </div>
</div>

loader.js

export default {
  props: {
    embedded: {
      default: false,
      type: Boolean,
    },
  },
};

loader.vue

<template src="./loader.html"/>
<script scr="./loader.js" lang="babel"></script>
<style src="./loader.scss" lang="scss" scoped/>

client.js

import Loader from '../../loader/loader.vue';

components: {
   Loader
}

client.html

<loader :embedded="true" />

Answer №1

Assumption:

By including the loader.js file using the src="./loader.js" in the .vue file's markup, it triggers an error as mentioned earlier. It appears that the component object is shared among multiple instances of the loader component, which may lead to conflicts with the embedded prop being passed or not passed in some cases. This situation could potentially result in other instances of the <loader /> constructor overwriting the prop value upon instantiation.

Resolution:

The issue can be resolved by modifying the import and export process within the script tag as follows:

loader.vue

<template src="./loader.html" />
<script lang="babel">
    import loader from './loader';

    export default loader;
</script>
<style src="./loader.scss" lang="scss" scoped />

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