Utilizing vue-i18n within Class-based Components in Vue 3

Question

Utilizing vue-i18n within Class-based Components in Vue 3

Currently, I am in the process of migrating from vue2 to vue3 and using the "Class Style Component".

I have been utilizing vue-i18n. Will I be able to continue using vue-i18n with Vue3?

Here is a snippet from my package.json:

  "dependencies": {

    "vue": "^3.3.4",
    "vue-class-component": "^8.0.0-0",
    "vue-i18n": "^9.5.0",
    "vue-property-decorator": "^10.0.0-rc.3",

Upon inspecting the browser console, I encountered the following error:

Uncaught SyntaxError: Must be called at the top of a `setup` function
    at createCompileError (message-compiler.esm-browser.js:99:19)
    at createI18nError (vue-i18n.mjs:101:12)
    at useI18n (vue-i18n.mjs:2294:15)
    at TestXXXXXX.vue:20:9

The error message indicates that it must be called at the top of a setup function. My question is, can we incorporate the "setup function" in a Class Style Component?

Below is an example of my code structure:

<script lang="ts">

import { useI18n } from 'vue-i18n';

@Component({
  i18n: useI18n()
})
export default class TestXXXXXX extends Vue {
:

If anyone could provide assistance, I would greatly appreciate it. Thank you in advance.

vue.js vuejs2 vuejs3 vue-i18n vue-class-components

Answer 1

Answer №1

Even though I mentioned it in a previous comment, you can still integrate vue-i18n with vue-class-component. In Vue3, you need to use useI18n at the beginning of a setup function as indicated in your error message. The vue-class-component exports a setup function that can be utilized in various ways, and we will demonstrate how to do so.

To start, you must create your app and install vue-i18n:

In your main.ts file or wherever your app starts:

import { createApp } from "vue";
import App from "./App.vue";
import { createI18n } from "vue-i18n";

const i18n = createI18n({
  locale: "en",
  legacy: false,
  messages: { // add your messages here
    en: {
      common: {
        message: "Hello world!",
      },
    },
  },
});

createApp(App).use(i18n).mount("#app");

You can now utilize $t and useI18n in your project. Here is how to proceed:

In your App.vue file:

<template>
  <HelloWorld msg="common.message"/> <!-- The translation key -->
</template>

<script lang="ts">
import { Options, Vue } from 'vue-class-component';
import HelloWorld from './components/HelloWorld.vue';

@Options({
  components: {
    HelloWorld,
  },
})
export default class App extends Vue {}
</script>

Lastly, in the HelloWorld.vue component, here are two methods to use it:

<template>
  <div>
    <h1>{{ $t(msg) }}</h1>
    <h2>{{ i18n.t('common.message') }}</h2>
  </div>
</template>

<script lang="ts">
import { Options, Vue, setup } from 'vue-class-component';
import { useI18n } from 'vue-i18n'

@Options({
  props: {
    msg: String
  }
})
export default class HelloWorld extends Vue {
  msg!: string      

  i18n = setup(() => {
    return useI18n()
  })
}
</script>

I would advise against using vue-class-component and recommend utilizing composition API with Vue3 and Typescript instead.

Regardless, I hope this information proves helpful :)

Answer 2

Even though I mentioned it in a previous comment, you can still integrate vue-i18n with vue-class-component. In Vue3, you need to use useI18n at the beginning of a setup function as indicated in your error message. The vue-class-component exports a setup function that can be utilized in various ways, and we will demonstrate how to do so.

To start, you must create your app and install vue-i18n:

In your main.ts file or wherever your app starts:

import { createApp } from "vue";
import App from "./App.vue";
import { createI18n } from "vue-i18n";

const i18n = createI18n({
  locale: "en",
  legacy: false,
  messages: { // add your messages here
    en: {
      common: {
        message: "Hello world!",
      },
    },
  },
});

createApp(App).use(i18n).mount("#app");

You can now utilize $t and useI18n in your project. Here is how to proceed:

In your App.vue file:

<template>
  <HelloWorld msg="common.message"/> <!-- The translation key -->
</template>

<script lang="ts">
import { Options, Vue } from 'vue-class-component';
import HelloWorld from './components/HelloWorld.vue';

@Options({
  components: {
    HelloWorld,
  },
})
export default class App extends Vue {}
</script>

Lastly, in the HelloWorld.vue component, here are two methods to use it:

<template>
  <div>
    <h1>{{ $t(msg) }}</h1>
    <h2>{{ i18n.t('common.message') }}</h2>
  </div>
</template>

<script lang="ts">
import { Options, Vue, setup } from 'vue-class-component';
import { useI18n } from 'vue-i18n'

@Options({
  props: {
    msg: String
  }
})
export default class HelloWorld extends Vue {
  msg!: string      

  i18n = setup(() => {
    return useI18n()
  })
}
</script>

I would advise against using vue-class-component and recommend utilizing composition API with Vue3 and Typescript instead.

Regardless, I hope this information proves helpful :)

Utilizing vue-i18n within Class-based Components in Vue 3

Answer №1

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