Fix e2e vue-cli Babel 8 tests (#13050)

Co-authored-by: Henry Zhu <hi@henryzoo.com>

scripts/integration-tests/e2e-vue-cli.sh

@@ -30,6 +30,12 @@ node "$PWD"/../../utils/bump-babel-dependencies.js
 yarn lerna exec -- node "$PWD"/../../utils/bump-babel-dependencies.js
 yarn install
 
+if [ "$BABEL_8_BREAKING" = true ] ; then
+  # Babel 8 defaults to "default, not ie 11", but this breaks vue-cli's tests
+  # which expect different ES features to be compiled.
+  patch -p1 < "$PWD"/../../patches/vue-cli-babel-8.patch
+fi
+
 # Test
 CI=true yarn test -p babel,babel-preset-app
 

scripts/integration-tests/patches/vue-cli-babel-8.patch

@@ -0,0 +1,79 @@
+diff --git a/packages/@vue/babel-preset-app/__tests__/babel-preset.spec.js b/packages/@vue/babel-preset-app/__tests__/babel-preset.spec.js
+index d57f42b..60c938a 100644
+--- a/packages/@vue/babel-preset-app/__tests__/babel-preset.spec.js
++++ b/packages/@vue/babel-preset-app/__tests__/babel-preset.spec.js
+@@ -3,7 +3,7 @@ const babel = require('@babel/core')
+ const preset = require('../index')
+ const defaultOptions = {
+   babelrc: false,
+-  presets: [preset],
++  presets: [[preset, { targets: { ie: 9 } }]],
+   filename: 'test-entry-file.js'
+ }
+ 
+@@ -161,6 +161,7 @@ test('disable absoluteRuntime', () => {
+   `.trim(), {
+     babelrc: false,
+     presets: [[preset, {
++      targets: { ie: 9 },
+       absoluteRuntime: false
+     }]],
+     filename: 'test-entry-file.js'
+@@ -183,6 +184,7 @@ test('should inject polyfills / helpers using "require" statements for a umd mod
+   `.trim(), {
+     babelrc: false,
+     presets: [[preset, {
++      targets: { ie: 9 },
+       absoluteRuntime: false
+     }]],
+     filename: 'test-entry-file.js'
+@@ -200,6 +202,7 @@ test('should inject polyfills / helpers using "import" statements for an es modu
+   `.trim(), {
+     babelrc: false,
+     presets: [[preset, {
++      targets: { ie: 9 },
+       absoluteRuntime: false
+     }]],
+     filename: 'test-entry-file.js'
+@@ -216,6 +219,7 @@ test('should not inject excluded polyfills', () => {
+   `.trim(), {
+     babelrc: false,
+     presets: [[preset, {
++      targets: { ie: 9 },
+       exclude: ['es.promise'],
+       polyfills: ['es.array.iterator', 'es.object.assign']
+     }]],
+diff --git a/packages/@vue/cli-plugin-babel/__tests__/transpileDependencies.spec.js b/packages/@vue/cli-plugin-babel/__tests__/transpileDependencies.spec.js
+index 1c5d6c2..6f90582 100644
+--- a/packages/@vue/cli-plugin-babel/__tests__/transpileDependencies.spec.js
++++ b/packages/@vue/cli-plugin-babel/__tests__/transpileDependencies.spec.js
+@@ -78,6 +78,14 @@ test('dep from node_modules should been transpiled when matched by transpileDepe
+     'vue.config.js',
+     `module.exports = { transpileDependencies: ['external-dep', '@scope/external-dep'] }`
+   )
++  await project.write(
++    'babel.config.js',
++    `module.exports = {
++      presets: [
++        ["@vue/babel-preset-app", { targets: { ie: 9 } }]
++      ]
++    }`
++  )
+   await project.run('vue-cli-service build')
+   expect(await readVendorFile()).toMatch('return "__TEST__"')
+ 
+@@ -89,6 +97,14 @@ test('dep from node_modules should been transpiled when transpileDependencies is
+     'vue.config.js',
+     `module.exports = { transpileDependencies: true }`
+   )
++  await project.write(
++    'babel.config.js',
++    `module.exports = {
++      presets: [
++        ["@vue/babel-preset-app", { targets: { ie: 9 } }]
++      ]
++    }`
++  )
+   await project.run('vue-cli-service build')
+   expect(await readVendorFile()).toMatch('return "__TEST__"')
+