Error in Vue-TypeScript application: Attempting to access properties of an undefined variable (specifically 'config')

Just starting out with Vue 3 & TypeScript and diving into PrimeVue. Currently, I'm working on a simple todo app to get the hang of things. However, I've hit a roadblock with an error message that reads:

Uncaught TypeError: Cannot read properties of undefined (reading 'config')
at Proxy.containerClass (menu.esm.js:306:50)
at ReactiveEffect.run (reactivity.esm-bundler.js:185:25)
at get value [as value] (reactivity.esm-bundler.js:1144:39)
at Object.get [as containerClass] (runtime-core.esm-bundler.js:3427:30)
at menu.esm.js:346:33
at Proxy.renderFnWithContext (runtime-core.esm-bundler.js:853:21)
at Proxy.<anonymous> (runtime-core.esm-bundler.js:1947:78)
at renderComponentRoot (runtime-core.esm-bundler.js:896:44)
at ReactiveEffect.componentUpdateFn [as fn] (runtime-core.esm-bundler.js:5580:57)
at ReactiveEffect.run (reactivity.esm-bundler.js:185:25)

Trying to decipher this error has been challenging. I've struggled to find the root cause within the code specifically related to the config term mentioned in the error message. Here's a snippet of the code that might provide some context:

 <script setup lang="ts">
 import { ref } from 'vue';
 import Menubar from 'primevue/menubar'
 import Menu from 'primevue/menu';

    const items = ref([
        {  
            items: [{
                label: 'Search',
                icon: 'pi pi-search',
                uri: './LeftNavigation.vue'
            },
            {
                label: 'View Completed',
                icon: 'pi pi-check-square', 
                uri: ''
            },
            {
                label: 'Delete',
                icon: 'pi pi-trash',
                uri: ''
            },
            {
                label: 'View Archived',
                icon: 'pi pi-cloud-upload',
                uri: ''
            },
            {
                label: 'View All',
                icon: 'pi pi-list',
                uri: ''
            },                                                                
        ]},
    ]);
   </script>

   <template>
     <div style="background-color:brown;width:50px">
       <Menu :model="items" />
     </div>
   </template>

   <style lang="scss" scoped>

   </style>

Answer №1

You successfully mounted the application but forgot to install the PrimeVue plugin first:

// main.ts
⋮
const app = createApp(App)
app.mount('#app') 👈
app.use(PrimeVue)
app.use(DialogService)

This resulted in the error that occurred when the PrimeVue component tried to access its configuration, which should have been set up by the plugin.

Resolution

Make sure to mount the component as the final initialization step:

// main.ts
⋮
const app = createApp(App)
app.use(PrimeVue)
app.use(DialogService)
app.mount('#app') 👈

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