feat: add entryFiles option, allowing explicit polyfill injection to specified files (#3470)

Author: WilsonLiu95

packages/@vue/babel-preset-app/README.md

@@ -97,3 +97,9 @@ Set to `false` to disable JSX support.
 - Default: `false`.
 
 Setting this to `true` will generate code that is more performant but less spec-compliant.
+
+### entryFiles
+
+- Default: `[]`
+
+Multi page repo use entryFiles to ensure inject polyfills to all entry file.

packages/@vue/babel-preset-app/index.js

@@ -52,6 +52,8 @@ module.exports = (context, options = {}) => {
     forceAllTransforms,
     decoratorsBeforeExport,
     decoratorsLegacy,
+    // entry file list
+    entryFiles,
 
     // Undocumented option of @babel/plugin-transform-runtime.
     // When enabled, an absolute path is used when importing a runtime helper atfer tranforming.
@@ -103,7 +105,7 @@ module.exports = (context, options = {}) => {
       ignoreBrowserslistConfig,
       configPath
     })
-    plugins.push([require('./polyfillsPlugin'), { polyfills }])
+    plugins.push([require('./polyfillsPlugin'), { polyfills, entryFiles }])
   } else {
     polyfills = []
   }

packages/@vue/babel-preset-app/polyfillsPlugin.js

@@ -1,13 +1,17 @@
 // add polyfill imports to the first file encountered.
-module.exports = ({ types }) => {
+module.exports = ({ types }, { entryFiles = [] }) => {
   let entryFile
   return {
     name: 'vue-cli-inject-polyfills',
     visitor: {
       Program (path, state) {
-        if (!entryFile) {
-          entryFile = state.filename
-        } else if (state.filename !== entryFile) {
+        if (entryFiles.length === 0) {
+          if (!entryFile) {
+            entryFile = state.filename
+          } else if (state.filename !== entryFile) {
+            return
+          }
+        } else if (!entryFiles.includes(state.filename)) {
           return
         }