Why does TypeScript struggle to locate imports within Vue class components when attempting to instantiate $refs, even though they are easily accessible when included as components?

Question

Why does TypeScript struggle to locate imports within Vue class components when attempting to instantiate $refs, even though they are easily accessible when included as components?

Currently, I am developing a Progressive Web App using Vue 2.0 with the Quasar Framework, and one of the challenges I'm facing is how to close the drawer in the left slot of the layout when a menu item is clicked.

Below is the script for the component named Home.ts:

import Vue from 'vue';
import Component from 'vue-class-component';

import {
  QIcon,
  QLayout,
  QList,
  QListHeader,
  QItem,
  QItemMain,
  QItemSide,
  QToolbar,
  QToolbarTitle,
} from 'quasar';

@Component({
  name: 'Home',
  components: {
    QIcon,
    QLayout,
    QList,
    QListHeader,
    QItem,
    QItemMain,
    QItemSide,
    QToolbar,
    QToolbarTitle,
  }
})
export default class Home extends Vue {

  $refs: {
    layout: QLayout // Cannot find name 'QLayout'
  };

  public newPainting() {
    this.$refs.layout.toggleLeft();
    this.$router.push(`painting/new`);
  }
}

The issue arises due to the error message Cannot find name 'QLayout', which can be resolved by changing the type of $refs.layout to any, as demonstrated below:

$refs: {
    layout: any
};

It's puzzling why QLayout cannot be found, considering it is utilized in the @Component() decorator.

Here is the content of the Home.vue file associated with the component (largely borrowed from the default template provided by quasar-cli):

<template>
  <q-layout ref="layout">
    <q-toolbar slot="header">
      <!-- opens drawer below-->
      <button class="hide-on-drawer-visible" @click="$refs.layout.toggleLeft()">
        <q-icon name="menu"></q-icon>
      </button>

      <q-toolbar-title>
        echroma
      </q-toolbar-title>
    </q-toolbar>

    <!-- Left Side Panel -->
    <div slot="left">
      <q-list no-border link inset-delimiter>
        <q-list-header>Menu</q-list-header>

        <q-item @click="newPainting()">
          <q-item-side icon="add_to_photos" />
          <q-item-main label="New Painting" sublabel="Start evolving a new painting!" />
        </q-item>

      </q-list>
    </div>

    <router-view />
  </q-layout>
</template>

<script>
import Home from './Home'
    export default Home
</script>

<style>
</style>

Would there be a specific reason why QLayout might not be accessible within the class declaration?

typescript vue.js vuejs2

Answer 1

Answer №1

It's possible that the reason is because QLayout is being treated as an object instead of a type.

The code you've written declares the instance variable $refs, but it doesn't initialize it properly. Using : signifies declaring a type, which may not be appropriate in this context.

export default class Home extends Vue {
  $refs: {
    layout: QLayout // The name 'QLayout' cannot be found
  };
  // ...
}

Perhaps you intended to initialize the variable before using it?

export default class Home extends Vue {
  $refs = {
    layout: QLayout // Assigning the variable 'QLayout' to the key 'layout'
  };
  // ...
}

Answer 2

It's possible that the reason is because QLayout is being treated as an object instead of a type.

The code you've written declares the instance variable $refs, but it doesn't initialize it properly. Using : signifies declaring a type, which may not be appropriate in this context.

export default class Home extends Vue {
  $refs: {
    layout: QLayout // The name 'QLayout' cannot be found
  };
  // ...
}

Perhaps you intended to initialize the variable before using it?

export default class Home extends Vue {
  $refs = {
    layout: QLayout // Assigning the variable 'QLayout' to the key 'layout'
  };
  // ...
}

Why does TypeScript struggle to locate imports within Vue class components when attempting to instantiate $refs, even though they are easily accessible when included as components?

Answer №1

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