Vue warning: Issue in rendering: "TypeError: Circular structure being converted to JSON"

After successfully creating a Single File Component in Vue without any compilation errors, I faced an issue when trying to view the component through its route link. Instead of the expected page, I encountered a stack trace printed in the Chrome browser using the Vue Devtools plugin.

The stack trace output in the Vue Devtools plugin console is as follows:

Vue warn: Error in render: 
[HMR] Waiting for update signal from WDS...
Vue warn: Error in render: "TypeError: Converting circular structure to JSON
    --> starting at object with constructor 'DockPanel'
    |     property '_layout' -> object with constructor 'DockLayout'
    --- property '_parent' closes the circle"

(found in

---> <Demo> at src/components/Demo.vue
       <App> at src/App.vue
         <Root>
warn @ vue.runtime.esm.js?2b0e:619
logError @ vue.runtime.esm.js?2b0e:1884
globalHandleError @ vue.runtime.esm.js?2b0e:1879
handleError @ vue.runtime.esm.js?2b0e:1839
Vue._render @ vue.runtime.esm.js?2b0e:3544
updateComponent @ vue.runtime.esm.js?2b0e:4060
get @ vue.runtime.esm.js?2b0e:4473
...

package.json

{
  "name": "client",
  "version": "0.1.0",
  ...
}

router.ts

import Vue from 'vue';
import Router from 'vue-router';
import Home from './views/Home.vue';
import Demo from './components/Demo.vue';
...

Demo.vue

<template>
  <div class="demo">
    <h1>{{ title }}</h1>
    {{ dpanel }}
  </div>
</template>

<script lang="ts">
import { Component, Prop, Vue } from 'vue-property-decorator';
import { Widget, DockPanel } from '@phosphor/widgets';
...

How can I troubleshoot and resolve this error to correctly render the widgets as intended?

Answer №1

Although I don't have much experience with PhosphorJS, I can offer some insight into the situation.

It seems like you are attempting to display a DockPanel instance within the template using {{ dpanel }}. Unfortunately, this method won't work. The "mustache syntax" is typically used for rendering simple data types such as strings and numbers. When you try to render an object this way, Vue will default to displaying the JSON representation of the object by utilizing JSON.stringify; in this scenario, the dpanel object has circular references, causing the rendering to fail.

After briefly reviewing the PhosphorJS documentation, it appears that PhosphorJS is not a Vue component library. Consequently, you will need to manually insert the DockPanel node into the DOM, likely within the mounted hook.

mounted() {
  this.$el.appendChild(this.dpanel.node)
},

destroyed() {
  this.dpanel.dispose()
}

Once again, I must emphasize that my knowledge of PhosphorJS is limited, so my advice may not be entirely accurate.

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