feat: make jest plugin work with TypeScript

packages/@vue/cli-plugin-typescript/generator/template/tsconfig.json

@@ -8,6 +8,9 @@
     "experimentalDecorators": true,
     "emitDecoratorMetadata": true,
     <%_ } _%>
+    <%_ if (hasJest) { _%>
+    "allowSyntheticDefaultImports": true,
+    <%_ } _%>
     "sourceMap": true,
     "baseUrl": ".",
     "paths": {

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

@@ -11,6 +11,8 @@ module.exports = api => {
 
   const jestConfig = {
     'moduleFileExtensions': [
+      'js',
+      'jsx',
       'json',
       // tell Jest to handle *.vue files
       'vue'
@@ -31,7 +33,6 @@ module.exports = api => {
   }
 
   if (!api.hasPlugin('typescript')) {
-    jestConfig.moduleFileExtensions.unshift('js', 'jsx')
     jestConfig.transform['^.+\\.jsx?$'] = 'babel-jest'
     api.extendPackage({
       devDependencies: {

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

@@ -18,8 +18,21 @@ module.exports = api => {
     const execa = require('execa')
     const jestBinPath = require.resolve('jest/bin/jest')
 
+    let testMatch = []
+    if (!args._.length && api.hasPlugin('typescript')) {
+      testMatch = [`--testMatch`, `<rootDir>/**/*.spec.(ts|tsx|js)`]
+    }
+
+    const argv = [
+      ...rawArgv,
+      ...testMatch
+    ]
+
     return new Promise((resolve, reject) => {
-      const child = execa(jestBinPath, rawArgv, { stdio: 'inherit' })
+      const child = execa(jestBinPath, argv, {
+        cwd: api.resolve('.'),
+        stdio: 'inherit'
+      })
       child.on('error', reject)
       child.on('exit', code => {
         if (code !== 0) {

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

@@ -18,10 +18,9 @@ module.exports = cli => {
         short: 'Mocha'
       },
       {
-        name: 'Jest (WIP)',
+        name: 'Jest',
         value: 'jest',
-        short: 'Jest',
-        disabled: true
+        short: 'Jest'
       }
     ]
   })