feat(v3): add sourcemap

packages/vue-cli-plugin-uni/lib/app-plus/index.js

@@ -22,6 +22,7 @@ const {
 
 const runtimePath = '@dcloudio/uni-mp-weixin/dist/mp.js'
 const wxsPath = '@dcloudio/uni-mp-weixin/dist/wxs.js'
+
 function getProvides (isAppService) {
   if (isAppService) {
     return { // app-service
@@ -44,7 +45,7 @@ function getProvides (isAppService) {
 const v3 = {
   vueConfig: {
     parallel: false,
-    transpileDependencies: [
+    transpileDependencies: [
       wxsPath,
       runtimePath
     ]
@@ -73,7 +74,11 @@ const v3 = {
 
     webpackConfig.optimization.splitChunks = false
 
-    let devtool = false
+    let devtool = false
+
+    if (isAppService && process.env.NODE_ENV !== 'production') {
+      devtool = 'eval-source-map'
+    }
 
     const rules = []