support suppress esm-bundler feature flags warning (#384)

jest.config.js

@@ -72,7 +72,8 @@ module.exports = {
     __ESM_BROWSER__: false,
     __NODE_JS__: true,
     __FEATURE_FULL_INSTALL__: true,
-    __FEATURE_LEGACY_API__: true
+    __FEATURE_LEGACY_API__: true,
+    __FEATURE_ESM_BUNDLER_WARN__: true
   },
 
   // The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.

packages/global.d.ts

@@ -14,6 +14,7 @@ declare let __COMMIT__: string
 declare let __FEATURE_PROD_DEVTOOLS__: boolean
 declare let __FEATURE_LEGACY_API__: boolean
 declare let __FEATURE_FULL_INSTALL__: boolean
+declare let __FEATURE_ESM_BUNDLER_WARN__: boolean
 
 // for tests
 declare namespace jest {

packages/vue-i18n/README.md

@@ -43,7 +43,9 @@ Internationalization plugin for Vue.js
   - If you bundle your app with webpack with `target: 'node'` and properly externalize `vue-i18n`, this is the build that will be loaded
   - The dev/prod files are pre-built, but the appropriate file is automatically required based on `process.env.NODE_ENV`
 
-## Bundler Build Feature Flags
+## For Bundler feature flags
+
+### Build Feature Flags
 
 The `esm-bundler` builds now exposes global feature flags that can be overwritten at compile time:
 
@@ -59,6 +61,10 @@ The build will work without configuring these flags, however it is **strongly re
 
 Note: the replacement value **must be boolean literals** and cannot be strings, otherwise the bundler/minifier will not be able to properly evaluate the conditions.
 
+## Other Feature Flags
+
+- `__FEATURE_ESM_BUNDLER_WARN__` (Suppress / Not suppress feature flags recommended warnings in build for `esm-bulder`)
+
 ## :copyright: License
 
 [MIT](http://opensource.org/licenses/MIT)

packages/vue-i18n/src/misc.ts

@@ -32,6 +32,10 @@ export function initFeatureFlags(): void {
     getGlobalThis().__INTLIFY_PROD_DEVTOOLS__ = false
   }
 
+  if (__DEV__ && typeof __FEATURE_ESM_BUNDLER_WARN__ === 'boolean') {
+    needWarn = __FEATURE_ESM_BUNDLER_WARN__
+  }
+
   if (__DEV__ && needWarn) {
     console.warn(
       `You are running the esm-bundler build of vue-i18n. It is recommended to ` +

rollup.config.js

@@ -232,6 +232,7 @@ function createReplacePlugin(
     __FEATURE_PROD_DEVTOOLS__: isBundlerESMBuild
       ? `__INTLIFY_PROD_DEVTOOLS__`
       : false,
+    __FEATURE_ESM_BUNDLER_WARN__: true,
     preventAssignment: false,
     ...(isProduction && isBrowserBuild
       ? {