@intlify/vue-i18n-loader

vue-i18n loader for custom blocks

NOTE: ⚠️ This next branch is development branch for Vue 3! The stable version is now in master branch!

Status: RC

⭐ Features

• i18n resource pre-compilation
• i18n custom block
  • i18n resource definition
  • i18n resource importing
  • Locale of i18n resource definition
  • Locale of i18n resource definition for global scope
  • i18n resource formatting

💿 Installation

NPM

$ npm i --save-dev @intlify/vue-i18n-loader@next

YARN

$ yarn add -D @intlify/vue-i18n-loader@next

🚀 i18n resource pre-compilation

Why do we need to require the configuration?

Since vue-i18n@v9.0, The locale messages are handled with message compiler, which converts them to javascript functions after compiling. After compiling, message compiler converts them into javascript functions, which can improve the performance of the application.

However, with the message compiler, the javascript function conversion will not work in some environments (e.g. CSP). For this reason, vue-i18n@v9.0 and later offer a full version that includes compiler and runtime, and a runtime only version.

If you are using the runtime version, you will need to compile before importing locale messages by managing them in a file such as .json.

You can pre-commpile by configuring vue-i18n-loader as the webpack loader.

webpack configration

As an example, if your project has the locale messagess in src/locales, your webpack config will look like this:

├── dist
├── index.html
├── package.json
├── src
│   ├── App.vue
│   ├── locales
│   │   ├── en.json
│   │   └── ja.json
│   └── main.js
└── webpack.config.js

import { createApp } from 'vue'
import { createI18n } from 'vue-i18n' // import from runtime only
import App from './App.vue'

// import i18n resources
import en from './locale/en.json'
import ja from './locale/ja.json'

const i18n = createI18n({
  locale: 'ja',
  messages: {
    en,
    ja
  }
})

const app = createApp(App)
app.use(i18n)
app.mount('#app')

In the case of the above project, you can use vue-i18n with webpack configuration to the following for runtime only:

module.exports = {
  module: {
    rules: [
      // ...
      {
        test: /\.(json5?|ya?ml)$/, // target json, json5, yaml and yml files
        type: 'javascript/auto',
        loader: '@intlify/vue-i18n-loader',
        include: [ // Use `Rule.include` to specify the files of locale messages to be pre-compiled
          path.resolve(__dirname, 'src/locales')
        ]
      },
      // ...
    ]
  }
}

The above uses webpack's Rule.include to specify the i18n resources to be precompiled. You can also use Rule.exclude to set the target.

🚀 i18n custom block

The below example that App.vue have i18n custom block:

i18n resource definition

<template>
  <p>{{ t('hello') }}</p>
</template>

<script>
import { useI18n } from 'vue-i18n'

export default {
  name: 'app',
  setup() {
    const { t, locale } = useI18n({
      // ...
    })

    // Somthing todo ...

    return {
      // ...
      t,
      locale,
      // ...
      })
    }
  }
}
</script>

<i18n>
{
  "en": {
    "hello": "hello world!"
  },
  "ja": {
    "hello": "こんにちは、世界!"
  }
}
</i18n>

The locale messages defined at i18n custom blocks are json format default.

i18n resource importing

You also can use src attribute:

<i18n src="./myLang.json"></i18n>

// ./myLang.json
{
  "en": {
    "hello": "hello world!"
  },
  "ja": {
    "hello": "こんにちは、世界!"
  }
}

Locale of i18n resource definition

You can define locale messages for each locale with locale attribute in single-file components:

<i18n locale="en">
{
  "hello": "hello world!"
}
</i18n>

<i18n locale="ja">
{
  "hello": "こんにちは、世界!"
}
</i18n>

The above defines two locales, which are merged at target single-file components.

Locale of i18n resource definition for global scope

You can define locale messages for global scope with global attribute:

<i18n global>
{
  "en": {
    "hello": "hello world!"
  }
}
</i18n>

i18n resource formatting

Besides json format, You can be used by specifying the following format in the lang attribute:

• yaml
• json5

example yaml foramt:

<i18n locale="en" lang="yaml">
  hello: "hello world!"
</i18n>

<i18n locale="ja" lang="yml">
  hello: "こんにちは、世界！"
</i18n>

example json5 format:

<i18n lang="json5">
{
  "en": {
    // comments
    "hello": "hello world!"
  }
}
</i18n>

JavaScript

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

// setup i18n instance with globaly
const i18n = createI18n({
  locale: 'ja',
  messages: {
    en: {
      // ...
    },
    ja: {
      // ...
    }
  }
})

const app = createApp(App)

app.use(i18n)
app.mount('#app')

webpack Config

vue-loader (next version):

module.exports = {
  module: {
    rules: [
      // ...
      {
        resourceQuery: /blockType=i18n/,
        type: 'javascript/auto',
        loader: '@intlify/vue-i18n-loader'
      },
      // ...
    ]
  }
}

🔧 Options

forceStringify

• Type: boolean

• Default: false

  Whether pre-compile number and boolean values as message functions that return the string value.

  for example, the following json resources:

  {
    "trueValue": true,
    "falseValue": false,
    "nullValue": null,
    "numberValue": 1
  }

  after pre-compiled (development):

  export default {
    "trueValue": (()=>{const fn=(ctx) => {const { normalize: _normalize } = ctx;return _normalize(["true"])};fn.source="true";return fn;})(),
    "falseValue": (()=>{const fn=(ctx) => {const { normalize: _normalize } = ctx;return _normalize(["false"])};fn.source="false";return fn;})(),
    "nullValue": (()=>{const fn=(ctx) => {const { normalize: _normalize } = ctx;return _normalize(["null"])};fn.source="null";return fn;})(),
    "numberValue": (()=>{const fn=(ctx) => {const { normalize: _normalize } = ctx;return _normalize(["1"])};fn.source="1";return fn;})()
  }

  webpack configration:

  module.exports = {
    module: {
      rules: [
        // ...
        {
          test: /\.(json5?|ya?ml)$/,
          type: 'javascript/auto',
          include: [path.resolve(__dirname, './src/locales')],
          use: [
            {
              loader: '@intlify/vue-i18n-loader',
              options: {
                forceStringify: true
              }
            }
          ]
        },
        // ...
      ]
    }
  }

📜 Changelog

Details changes for each release are documented in the CHANGELOG.md.

💪 Contribution

Please make sure to read the Contributing Guide before making a pull request.

©️ License

MIT