refactor: remove experimentalCompileTsWithBabel

packages/@vue/cli-plugin-typescript/generator/index.js

@@ -1,8 +1,7 @@
 module.exports = (api, {
   classComponent,
   tsLint,
-  lintOn = [],
-  experimentalCompileTsWithBabel
+  lintOn = []
 }) => {
   if (typeof lintOn === 'string') {
     lintOn = lintOn.split(',')
@@ -17,35 +16,6 @@ module.exports = (api, {
     })
   }
 
-  if (experimentalCompileTsWithBabel) {
-    api.extendPackage({
-      devDependencies: {
-        '@babel/preset-typescript': '7 || ^7.0.0-beta || ^7.0.0-rc'
-      },
-      vue: {
-        experimentalCompileTsWithBabel: true
-      },
-      babel: {
-        presets: ['@babel/typescript', '@vue/app']
-      }
-    })
-
-    if (classComponent) {
-      api.extendPackage({
-        devDependencies: {
-          '@babel/plugin-proposal-decorators': '7 || ^7.0.0-beta || ^7.0.0-rc',
-          '@babel/plugin-proposal-class-properties': '7 || ^7.0.0-beta || ^7.0.0-rc'
-        },
-        babel: {
-          plugins: [
-            '@babel/proposal-decorators',
-            ['@babel/proposal-class-properties', { 'loose': true }]
-          ]
-        }
-      })
-    }
-  }
-
   if (tsLint) {
     api.extendPackage({
       scripts: {

packages/@vue/cli-plugin-typescript/index.js

@@ -1,7 +1,6 @@
 module.exports = (api, {
   parallel,
-  lintOnSave,
-  experimentalCompileTsWithBabel
+  lintOnSave
 }) => {
   const fs = require('fs')
   const useThreads = process.env.NODE_ENV === 'production' && parallel
@@ -35,35 +34,26 @@ module.exports = (api, {
       })
     }
 
-    if (!experimentalCompileTsWithBabel) {
-      if (api.hasPlugin('babel')) {
-        addLoader({
-          loader: 'babel-loader'
-        })
-      }
-      addLoader({
-        loader: 'ts-loader',
-        options: {
-          transpileOnly: true,
-          appendTsSuffixTo: [/\.vue$/],
-          // https://github.com/TypeStrong/ts-loader#happypackmode-boolean-defaultfalse
-          happyPackMode: useThreads
-        }
-      })
-      // make sure to append TSX suffix
-      tsxRule.use('ts-loader').loader('ts-loader').tap(options => {
-        delete options.appendTsSuffixTo
-        options.appendTsxSuffixTo = [/\.vue$/]
-        return options
-      })
-    } else {
-      // Experimental: compile TS with babel so that it can leverage
-      // preset-env for auto-detected polyfills based on browserslists config.
-      // this is pending on the readiness of @babel/preset-typescript.
+    if (api.hasPlugin('babel')) {
       addLoader({
         loader: 'babel-loader'
       })
     }
+    addLoader({
+      loader: 'ts-loader',
+      options: {
+        transpileOnly: true,
+        appendTsSuffixTo: [/\.vue$/],
+        // https://github.com/TypeStrong/ts-loader#happypackmode-boolean-defaultfalse
+        happyPackMode: useThreads
+      }
+    })
+    // make sure to append TSX suffix
+    tsxRule.use('ts-loader').loader('ts-loader').tap(options => {
+      delete options.appendTsSuffixTo
+      options.appendTsxSuffixTo = [/\.vue$/]
+      return options
+    })
 
     config
       .plugin('fork-ts-checker')

packages/@vue/cli-plugin-typescript/prompts.js

@@ -10,11 +10,7 @@ module.exports = [
     type: `confirm`,
     message: `Use class-style component syntax?`
   },
-  process.env.VUE_CLI_EXPERIMENTAL ? {
-    name: `experimentalCompileTsWithBabel`,
-    type: `confirm`,
-    message: `Compile TS with babel? ${chalk.yellow(`(experimental)`)}`
-  } : {
+  {
     name: `useTsWithBabel`,
     type: `confirm`,
     message: `Use Babel alongside TypeScript for auto-detected polyfills?`

packages/@vue/cli/lib/promptModules/babel.js

@@ -8,7 +8,7 @@ module.exports = cli => {
 
   cli.onPromptComplete((answers, options) => {
     if (answers.features.includes('ts')) {
-      if (!answers.useTsWithBabel && !answers.experimentalCompileTsWithBabel) {
+      if (!answers.useTsWithBabel) {
         return
       }
     } else {

packages/@vue/cli/lib/promptModules/typescript.js

@@ -1,5 +1,3 @@
-const chalk = require('chalk')
-
 module.exports = cli => {
   cli.injectFeature({
     name: 'TypeScript',
@@ -14,22 +12,13 @@ module.exports = cli => {
     message: 'Use class-style component syntax?'
   })
 
-  if (process.env.VUE_CLI_EXPERIMENTAL) {
-    cli.injectPrompt({
-      name: 'compileTsWithBabel',
-      when: answers => answers.features.includes('ts'),
-      type: 'confirm',
-      message: `Compile TS with babel? ${chalk.yellow(`(experimental)`)}`
-    })
-  } else {
-    cli.injectPrompt({
-      name: 'useTsWithBabel',
-      when: answers => answers.features.includes('ts'),
-      type: 'confirm',
-      message: 'Use Babel alongside TypeScript for auto-detected polyfills?',
-      default: answers => answers.features.includes('babel')
-    })
-  }
+  cli.injectPrompt({
+    name: 'useTsWithBabel',
+    when: answers => answers.features.includes('ts'),
+    type: 'confirm',
+    message: 'Use Babel alongside TypeScript for auto-detected polyfills?',
+    default: answers => answers.features.includes('babel')
+  })
 
   cli.onPromptComplete((answers, options) => {
     if (answers.features.includes('ts')) {
@@ -42,8 +31,6 @@ module.exports = cli => {
       }
       if (answers.useTsWithBabel) {
         tsOptions.useTsWithBabel = true
-      } else if (answers.compileTsWithBabel) {
-        tsOptions.experimentalCompileTsWithBabel = true
       }
       options.plugins['@vue/cli-plugin-typescript'] = tsOptions
     }