The instance is referring to a property or method that is not defined, but being used during rendering. Verify that the property is reactive and included in the data option

I'm a newcomer to vue JS and facing a challenge with creating vue class components. My setup includes:

@rails/webpacker: "^5.1.1" typescript: "^4.0.2" vue: "^2.6.11" vue-class-component: "^7.2.5"

Below is the code snippet:

MockChat.vue

<template>
  <!-- Your template code here -->
</template>

<script lang="ts">
// Your script code here
</script>

You're encountering the following warning:

[Vue warn]: Property or method "messages" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property

The issue arises when passing messages data to Chat component where it's not being recognized.

Even after using the data: {} option to declare the data properties, the error persists.

If you have any insights or solutions, your help would be greatly appreciated.

typescriptvue.js

Answer №1

Solution: I successfully initialized the array messages: any[]; by using messages: any[] = [];

This approach resolved the issue for me.

To solve similar issues with the rest of the declared data variables, remember to initialize them to some value.

  messages: any[] = [];
  state: object = {};
  recommendation: object = {};
  selectedBusinessUnit: string;
  selectedGraph: string;
  dataTopics: string[];
  selectedTopic: string;
  selectedAgentId: string = "";
  mockview: boolean = true;

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