fix: revert accidentally committed jest related changes

Author: haoqunjiang

packages/@vue/cli-plugin-unit-jest/__tests__/jestGenerator.spec.js

@@ -25,6 +25,8 @@ test('base', async () => {
 
   // should inject babel-jest
   expect(pkg.devDependencies).toHaveProperty('babel-jest')
+  // babel-core 6 -> 7 shim
+  expect(pkg.devDependencies).toHaveProperty('babel-core')
   // eslint
   expect(files['tests/unit/.eslintrc.js']).toMatch('jest: true')
 

packages/@vue/cli-plugin-unit-jest/generator/index.js

@@ -54,14 +54,22 @@ module.exports = (api, _, __, invoking) => {
     if (api.hasPlugin('babel')) {
       api.extendPackage({
         devDependencies: {
-          'babel-jest': '^24.7.1'
+          'babel-jest': '^23.6.0',
+          // this is for now necessary to force babel-jest and vue-jest to use babel 7
+          'babel-core': '7.0.0-bridge.0'
         }
       })
     } else {
-      api.extendPackage({
-        babel: {
-          plugins: ['transform-es2015-modules-commonjs']
-        }
+      // Jest's shipped babel-jest still uses babel 6,
+      // so we cannot use extendPackage which renders babel.config.js.
+      api.render(files => {
+        files['.babelrc'] = JSON.stringify(
+          {
+            plugins: ['transform-es2015-modules-commonjs']
+          },
+          null,
+          2
+        )
       })
     }
   } else {

packages/@vue/cli-plugin-unit-jest/package.json

@@ -23,10 +23,9 @@
     "access": "public"
   },
   "dependencies": {
-    "@babel/core": "^7.4.4",
-    "@babel/plugin-transform-modules-commonjs": "^7.4.4",
     "@vue/cli-shared-utils": "^3.6.0",
     "babel-jest": "^24.7.1",
+    "babel-plugin-transform-es2015-modules-commonjs": "^6.26.2",
     "jest": "^24.7.1",
     "jest-serializer-vue": "^2.0.2",
     "jest-transform-stub": "^2.0.0",

yarn.lock

@@ -3507,7 +3507,7 @@ babel-plugin-syntax-object-rest-spread@^6.8.0:
   resolved "https://registry.yarnpkg.com/babel-plugin-syntax-object-rest-spread/-/babel-plugin-syntax-object-rest-spread-6.13.0.tgz#fd6536f2bce13836ffa3a5458c4903a597bb3bf5"
   integrity sha1-/WU28rzhODb/o6VFjEkDpZe7O/U=
 
-babel-plugin-transform-es2015-modules-commonjs@^6.26.0:
+babel-plugin-transform-es2015-modules-commonjs@^6.26.0, babel-plugin-transform-es2015-modules-commonjs@^6.26.2:
   version "6.26.2"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-modules-commonjs/-/babel-plugin-transform-es2015-modules-commonjs-6.26.2.tgz#58a793863a9e7ca870bdc5a881117ffac27db6f3"
   integrity sha512-CV9ROOHEdrjcwhIaJNBGMBCodN+1cfkwtM1SbUHmvyy35KGT7fohbpOxkE2uLz1o6odKK2Ck/tz47z+VqQfi9Q==