fix: fix vuex inject store

Author: haoqunjiang

packages/@vue/cli-plugin-vuex/__tests__/vuexGenerator.spec.js

@@ -31,6 +31,7 @@ test('use with Vue 3', async () => {
 
   expect(files['src/store/index.js']).toBeTruthy()
   expect(files['src/store/index.js']).toMatch('import { createStore }')
+  expect(files['src/main.js']).toMatch('.use(store)')
 
   expect(pkg.dependencies).toHaveProperty('vuex')
   expect(pkg.dependencies.vuex).toMatch('^4')

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

@@ -2,7 +2,7 @@ module.exports = (api, options = {}, rootOptions = {}) => {
   api.injectImports(api.entryFile, `import store from './store'`)
 
   if (rootOptions.vueVersion === '3') {
-    api.transformScript(api.entryFile, require('./inject-use-store'))
+    api.transformScript(api.entryFile, require('./injectUseStore'))
     api.extendPackage({
       dependencies: {
         vuex: '^4.0.0-0'

packages/@vue/cli-plugin-vuex/generator/inject-use-store.js renamed to packages/@vue/cli-plugin-vuex/generator/injectUseStore.js

@@ -24,4 +24,6 @@ module.exports = (file, api) => {
       [j.identifier('store')]
     )
   })
+
+  return root.toSource()
 }