@intlify/unplugin-vue-i18n

unplugin for Vue I18n

🌟 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 i @intlify/unplugin-vue-i18n

Vite

// vite.config.ts
import VueI18nPlugin from '@intlify/unplugin-vue-i18n/vite'

export default defineConfig({
  plugins: [
    VueI18nPlugin({ /* options */ }),
  ],
})

Webpack

const VueI18nPlugin = require('@intlify/unplugin-vue-i18n/webpack')

// webpack.config.js
module.exports = {
  /* ... */
  plugins: [
    VueI18nPlugin({ /* options */ })
  ]
}

Nuxt

// nuxt.config.ts
import { defineNuxtConfig } from 'nuxt'
import VueI18nPlugin from '@intlify/unplugin-vue-i18n'

export default defineNuxtConfig({
  vite: {
    plugins: [
      VueI18nPlugin.vite({ /* options */ }),
    ],
  },
  // When using Webpack
  // builder: '@nuxt/webpack-builder',
  webpack: {
    plugins: [
      VueI18nPlugin.webpack({ /* options */ }),
    ]
  }
})

🚀 Usage

i18n resources pre-compilation

Since [email protected], 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, [email protected] 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.

i18n custom block

The below example that examples/vite/src/App.vue have i18n custom block:

<template>
  <form>
    <label>{{ t('language') }}</label>
    <select v-model="locale">
      <option value="en">en</option>
      <option value="ja">ja</option>
    </select>
  </form>
  <p>{{ t('hello') }}</p>
  <Banana />
</template>

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

export default {
  name: 'App',
  components: {
    Banana
  },
  setup() {
    const { t, locale } = useI18n({
      inheritLocale: true,
      useScope: 'local'
    })
    return { t, locale }
  }
}
</script>

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

Locale Messages formatting

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

• json (default)
• yaml
• yml
• json5

example yaml format:

<i18n lang="yaml">
en:
  hello: 'Hello World!'
ja:
  hello: 'こんにちは、世界！'
</i18n>

Static bundle importing

unplugin-vue-i18n allows you to statically bundle i18n resources such as json or yaml specified by the include option of the plugin described below as locale messages with the import syntax.

In this case, only one i18n resource can be statically bundled at a time with import syntax, so the these code will be redundant for multiple locales.

import { createApp } from 'vue'
import { createI18n } from 'vue-i18n'
/*
 * The i18n resources in the path specified in the plugin `include` option can be read
 * as vue-i18n optimized locale messages using the import syntax
 */
import en from './src/locales/en.json'
import ja from './src/locales/ja.yaml'
import fr from './src/locales/fr.json5'

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

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

unplugin-vue-i18n can use the bundler virtual mechanism to import all locales at once, using the special identifier @intlify/unplugin-vue-i18n/messages, as the bellow:

import { createApp } from 'vue'
import { createI18n } from 'vue-i18n'
/*
 * All i18n resources specified in the plugin `include` option can be loaded
 * at once using the import syntax
 */
import messages from '@intlify/unplugin-vue-i18n/messages'

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

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

Change your vite.config.ts file accordingly to import all the files from locales folder on the root. Change './src/locales/**' to path of your locales.

// vite.config.ts
import VueI18nPlugin from '@intlify/unplugin-vue-i18n/vite'
import path from 'path'

export default defineConfig({
  plugins: [
    VueI18nPlugin({
      include: [path.resolve(__dirname, './src/locales/**')],
    }),
  ],
})

Types

If you want type definition of @intlify/unplugin-vue-i18n/messages, add unplugin-vue-i18n/messages to compilerOptions.types of your tsconfig:

{
  "compilerOptions": {
    "types": ["@intlify/unplugin-vue-i18n/messages"]
  }
}

📦 Automatic bundling

For Vue I18n

As noted here, NPM provides many different builds of Vue I18n.

This plugin will automatically select and bundle Vue I18n build according to the following behavior:

• development: vue-i18n.esm-bundler.js
• production: vue-i18n.runtime.esm-bundler.js

About details, See the here

For petite-vue-i18n

This plugin will automatically select and bundle petite-vue-i18n build according to the following vite behavior:

• vite dev: petite-vue-i18n.esm-bundler.js
• vite build: petite-vue-i18n.runtime.esm-bundler.js

🔧 Options

include

• Type: string | string[] | undefined

• Default: undefined

  A picomatch pattern, or array of patterns, you can specify a path to pre-compile i18n resources files. The extensions of i18n resources to be precompiled are as follows:

  - json
  - json5
  - yaml
  - yml
  - js
  - ts
  

  If nothing is specified for this option, i.e. undefined, nothing is done to the resource in the above format.

  ⚠️ NOTE: json resources matches this option, it will be handled before the internal json plugin of bundler, and will not be processed afterwards, else the option doesn't match, the bundler side will handle.

  ⚠️ NOTE: yaml resources don't support multi documentation with |, alias with & and *, tags with ! , @, etc. Only simple data structures.

  ⚠️ NOTE: js and ts resources are set simple export (export default) as locale messages object, as default.

  export default {
    hello: 'Hello, {name}!',
    // ...
  }

  If you need to use programmatically dynamic resource construction, you would be enable allowDynamic option. about details, see the section.

  ⚠️ NOTE: If you use the js and ts resources formats, set the paths, so your application code is not targeted. We recommend that resources be isolated from the application code.

strictMessage

• Type: boolean

• Default: true

  Strictly checks that the locale message does not contain html tags.

  If html tags are included, an error is thrown.

  If you would not the error to be thrown, you can work around it by setting it to false, but it means that the locale message might cause security problems with XSS.

  In that case, we recommend setting the escapeHtml option to true.

escapeHtml

• Type: boolean

• Default: false

  Whether to escape html tags if they are included in the locale message.

  If strictMessage is disabled by false, we recommend this option be enabled.

allowDynamic

• Type: boolean

• Default: false

  Whether or not programmatically dynamic resource construction for js or ts resource format.

  In this case, you need to export the function with export default and construct the resource with the function:

  import resources from './locales/all.json'
  
  export default async function loadResource(url) {
    const res = await import(url).then(r => r.default || r)
    return { ...resources, ...res }
  }

  If you fetch some resources from the backend, the data must be pre-compiled for production. exmaple is here.

runtimeOnly

• Type: boolean

• Default: true

  Whether or not to automatically use Vue I18n runtime-only in production build, set vue-i18n.runtime.esm-bundler.js in the vue-i18n field of bundler config, the below:

  - vite config: `resolve.alias`
  - webpack config: `resolve.alias`
  

  If false is specified, Vue I18n (vue-i18n) package.json module field will be used.

  For more details, See here

compositionOnly

• Type: boolean

• Default: true

  Whether to make vue-i18n API only composition API. By default the legacy API is tree-shaken.

  For more details, See here

fullInstall

• Type: boolean

• Default: true

  Whether to install the full set of APIs, components, etc. provided by Vue I18n. By default, all of them will be installed.

  If false is specified, buld-in components and directive will not be installed in vue and will be tree-shaken.

  For more details, See here

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;})()
  }

defaultSFCLang

• Type: string

• Default: 'json'

  Specify the content for all your inlined i18n custom blocks on your SFC.

  defaultSFCLang must have one of the following values:

  - json
  - json5
  - yaml
  - yml
  

  On inlined i18n custom blocks that have specified the lang attribute, the defaultSFCLang is not applied.

  For example, with defaultSFCLang: "yaml" or defaultSFCLang: "yml", this custom block:

  <i18n lang="yaml">
  en:
    hello: Hello
  es:
    hello: Hola
  </i18n>

  and this another one, are equivalent:

  <i18n>
  en:
    hello: Hello
  es:
    hello: Hola
  </i18n>

globalSFCScope

• Type: boolean

• Default: undefined

  Whether to include all i18n custom blocks on your SFC on global scope.

  If true, it will be applied to all inlined i18n or imported custom blocks.

  Warning: beware enabling globalSFCScope: true, all i18n custom blocks in all your SFC will be on global scope.

  For example, with globalSFCScope: true, this custom block:

  <i18n lang="yaml" global>
  en:
    hello: Hello
  es:
    hello: Hola
  </i18n>

  and this another one, are equivalent:

  <i18n lang="yaml">
  en:
    hello: Hello
  es:
    hello: Hola
  </i18n>

  You can also use defaultSFCLang: "yaml", following with previous example, this another is also equivalent to previous ones:

  <i18n>
  en:
    hello: Hello
  es:
    hello: Hola
  </i18n>

bridge

• Type: boolean

• Default: false

  The mode to birdge the i18n custom block to work in both [email protected] and [email protected] environments.

  To support in a smooth transition from [email protected] to [email protected], we provide a mode that bundles the i18n custom block to be available in either version.

  ⚠️ Note that if you set bridge: true, the bundle size will increase. It is recommended to disable this mode after the migration from [email protected] to [email protected] is completed.

esm

• Type: boolean

• Default: true

  For bridge option is true, whether to bundle locale resources with ESM. By default ESM, if you need to bundl with commonjs for especialy webpack, you need to set false

useClassComponent

• Type: boolean

• Default: false

  This option that to use i18n custom blocks in vue-class-component.

useVueI18nImportName (Experimental)

• Type: boolean

• Default: false

  Whether to use the import name of petite-vue-i18n with the same import name as vue-i18n (import { xxx } from 'vue-i18n').

  This option allows a smooth migration from petite-vue-i18n to vue-i18n and allows progressive enhacement.

📜 Changelog

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

©️ License

MIT