fix: allow v3 cli to invoke vuex & router plugin from inside cli-service (#4696)

packages/@vue/cli-service/generator/index.js

@@ -1,5 +1,3 @@
-const { execa } = require('@vue/cli-shared-utils')
-
 module.exports = (api, options) => {
   api.render('./template', {
     doesCompile: api.hasPlugin('babel') || api.hasPlugin('typescript')
@@ -58,39 +56,12 @@ module.exports = (api, options) => {
 
   // for v3 compatibility
   if (options.router && !api.hasPlugin('router')) {
-    api.extendPackage({
-      devDependencies: {
-        '@vue/cli-plugin-router': '^4.0.0'
-      }
-    })
-
-    api.onCreateComplete(() => {
-      execa.sync('vue', [
-        'invoke',
-        '@vue/cli-plugin-router',
-        `--historyMode=${options.routerHistoryMode ? 'true' : ''}`
-      ], {
-        cwd: api.resolve('.')
-      })
-    })
+    require('./router')(api, options)
   }
 
   // for v3 compatibility
   if (options.vuex && !api.hasPlugin('vuex')) {
-    api.extendPackage({
-      devDependencies: {
-        '@vue/cli-plugin-vuex': '^4.0.0'
-      }
-    })
-
-    api.onCreateComplete(() => {
-      execa.sync('vue', [
-        'invoke',
-        '@vue/cli-plugin-vuex'
-      ], {
-        cwd: api.resolve('.')
-      })
-    })
+    require('./vuex')(api)
   }
 
   // additional tooling configurations

packages/@vue/cli-service/generator/router.js

@@ -0,0 +1,5 @@
+module.exports = (api, options) => {
+  require('@vue/cli-plugin-vuex/generator')(api, {
+    historyMode: options.routerHistoryMode
+  })
+}

packages/@vue/cli-service/generator/vuex.js

@@ -0,0 +1,3 @@
+module.exports = api => {
+  require('@vue/cli-plugin-vuex/generator')(api)
+}

packages/@vue/cli-service/package.json

@@ -26,6 +26,8 @@
     "@intervolga/optimize-cssnano-plugin": "^1.0.5",
     "@soda/friendly-errors-webpack-plugin": "^1.7.1",
     "@vue/cli-overlay": "^4.0.2",
+    "@vue/cli-plugin-router": "^4.0.2",
+    "@vue/cli-plugin-vuex": "^4.0.2",
     "@vue/cli-shared-utils": "^4.0.2",
     "@vue/component-compiler-utils": "^3.0.0",
     "@vue/preload-webpack-plugin": "^1.1.0",