feat: runtimeOnly option (#57)

* feat: runtimeOnly option

* update docs

Author: kazupon

README.md

@@ -30,6 +30,7 @@ $ yarn add -D @intlify/vite-plugin-vue-i18n
 
 When this plugin is installed, Vue I18n can only use the Composition API, and if you want to use the Legacy API, you need to set the `compositionOnly` option to `false`.
 
+Also, if you do a production build with vite, Vue I18n will automatically bundle the runtime only module. If you need on-demand compilation with Message compiler, you need to set the `runtimeOnly` option to `false`.
 
 ## :rocket: Usage
 
@@ -215,6 +216,15 @@ About details, See the below section
 
   Note `json` resources matches this option, it will be handled **before the internal json plugin of Vite, and will not be processed afterwards**, else the option doesn't match, the Vite side will handle.
 
+### `runtimeOnly`
+- **Type:** `boolean`
+- **Default:** `true`
+
+  Whether or not to automatically use Vue I18n **runtime-only** in production build, set in the `vue-i18n` field of Vite `alias` option.
+  If `false` is specified, Vue I18n (vue-i18n) package.json `module` field will be used.
+
+  For more details, See [here](#package-automatic-vue-i18n-bundling)
+
 ### `compositionOnly`
 
 - **Type:** `boolean`

src/index.ts

@@ -43,6 +43,9 @@ function pluginI18n(
 
   const env = process.env.NODE_ENV || 'development'
   const filter = createFilter(include)
+  const runtimeOnly = isBoolean(options.runtimeOnly)
+    ? options.runtimeOnly
+    : true
   const compositionOnly = isBoolean(options.compositionOnly)
     ? options.compositionOnly
     : true
@@ -58,7 +61,7 @@ function pluginI18n(
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
       const partialConfig: any = { define: {}, alias: {} }
 
-      if (env === 'production') {
+      if (env === 'production' && runtimeOnly) {
         partialConfig.alias['vue-i18n'] =
           'vue-i18n/dist/vue-i18n.runtime.esm-bundler.js'
         debug('set vue-i18n runtime only')

src/options.ts

@@ -1,5 +1,6 @@
 export type VitePluginVueI18nOptions = {
   forceStringify?: boolean
+  runtimeOnly?: boolean
   compositionOnly?: boolean
   fullInstall?: boolean
   include?: string | string[]