feat(cli-service): provide jsconfig.json in no-ts template (#6285)

Author: yoyo930021

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

@@ -1,6 +1,7 @@
 module.exports = (api, options) => {
   api.render('./template', {
-    doesCompile: api.hasPlugin('babel') || api.hasPlugin('typescript')
+    doesCompile: api.hasPlugin('babel') || api.hasPlugin('typescript'),
+    useBabel: api.hasPlugin('babel')
   })
 
   if (options.vueVersion === '3') {
@@ -74,4 +75,9 @@ module.exports = (api, options) => {
   if (options.configs) {
     api.extendPackage(options.configs)
   }
+
+  // Delete jsconfig.json when typescript
+  if (api.hasPlugin('typescript')) {
+    api.render((files) => delete files['jsconfig.json'])
+  }
 }

packages/@vue/cli-service/generator/template/jsconfig.json

@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "<%- options.useBabel ? 'esnext' : 'es5' %>",
+    "module": "esnext",
+    "baseUrl": "./",
+    "moduleResolution": "node",
+    "paths": {
+      "@/*": [
+        "src/*"
+      ]
+    },
+    "lib": [
+      "esnext",
+      "dom",
+      "dom.iterable",
+      "scripthost"
+    ]
+  }
+}