fix: pwa plugin should be ignored when target is not app

close #1497

Author: yyx990803

packages/@vue/cli-plugin-pwa/index.js

@@ -1,5 +1,10 @@
 module.exports = (api, options) => {
   api.chainWebpack(webpackConfig => {
+    const target = process.env.VUE_CLI_BUILD_TARGET
+    if (target && target !== 'app') {
+      return
+    }
+
     const name = api.service.pkg.name
     const userOptions = options.pwa || {}
 

packages/@vue/cli-service/lib/Service.js

@@ -194,10 +194,9 @@ module.exports = class Service {
 
     // check if the user has manually mutated output.publicPath
     const target = process.env.VUE_CLI_BUILD_TARGET
-    const exceptionTargets = ['lib', 'wc', 'wc-async']
     if (
       !process.env.VUE_CLI_TEST &&
-      !exceptionTargets.includes(target) &&
+      (target && target !== 'app') &&
       config.output.publicPath !== this.projectOptions.baseUrl
     ) {
       throw new Error(