fix(app): don't compile app.css.js when project has no nvue page (#3403)

packages/uni-app-vite/src/nvue/plugin/index.ts

@@ -29,6 +29,7 @@ import { transformRootNode } from './transforms/transformRootNode'
 import { transformModel } from './transforms/vModel'
 import { transformShow } from './transforms/vShow'
 import { transformAttrs } from './transforms/transformAttrs'
+import { nvuePagesCache } from '../plugins/pagesJson'
 
 const uTags = {
   text: 'u-text',
@@ -118,13 +119,18 @@ export function uniAppNVuePlugin({
             if (!cssLangRE.test(filename) || commonjsProxyRE.test(filename)) {
               return
             }
+            const nvuePages = nvuePagesCache.get(config)
+            if (!nvuePages || !Object.keys(nvuePages).length) {
+              // 当前项目没有 nvue 文件
+              return { code: `export default {}`, map: { mappings: '' } }
+            }
             const { code, messages } = await parse(source, {
               filename,
               logLevel: 'WARNING',
             })
             messages.forEach((message) => {
               if (message.type === 'warning') {
-                let msg = `[plugin:vite:css] ${message.text}`
+                let msg = `[plugin:vite:nvue-css] ${message.text}`
                 if (message.line && message.column) {
                   msg += `\n${generateCodeFrame(source, {
                     line: message.line,

packages/uni-app-vite/src/nvue/plugins/pagesJson.ts

 import path from 'path'
-import type { Plugin } from 'vite'
+import type { Plugin, ResolvedConfig } from 'vite'
 import type { CompilerOptions } from '@vue/compiler-sfc'
 import {
   defineUniPagesJsonPlugin,
@@ -20,6 +20,8 @@ interface NVuePages {
   }
 }
 
+export const nvuePagesCache = new Map<ResolvedConfig, NVuePages>()
+
 export function uniPagesJsonPlugin({
   renderer,
   appService,
@@ -36,6 +38,9 @@ export function uniPagesJsonPlugin({
     return {
       name: 'uni:app-nvue-pages-json',
       enforce: 'pre',
+      configResolved(config) {
+        nvuePagesCache.set(config, nvuePages)
+      },
       transform(code, id) {
         if (!opts.filter(id)) {
           return
@@ -47,6 +52,9 @@ export function uniPagesJsonPlugin({
           this.addWatchFile(filepath)
         })
         const pagesJson = normalizePagesJson(code, process.env.UNI_PLATFORM)
+        Object.keys(nvuePages).forEach((name) => {
+          delete nvuePages[name]
+        })
         pagesJson.pages.forEach((page) => {
           if (page.style.isNVue) {
             const filename = normalizePath(