fix: fix dev mode compatibility with workers (#4034)

haoqunjiang · haoqunjiang · commit 6f085d36a4b8 · 2019-05-25T22:08:36.000+08:00
fixes #3539 (cherry picked from commit d81d57b)
diff --git a/packages/@vue/cli-service/lib/config/dev.js b/packages/@vue/cli-service/lib/config/dev.js
@@ -11,9 +11,10 @@ module.exports = (api, options) => {
           .use(require('webpack/lib/HotModuleReplacementPlugin'))
 
       // https://github.com/webpack/webpack/issues/6642
+      // https://github.com/vuejs/vue-cli/issues/3539
       webpackConfig
         .output
-          .globalObject('this')
+          .globalObject(`(typeof self !== 'undefined' ? self : this)`)
 
       if (!process.env.VUE_CLI_TEST && options.devServer.progress !== false) {
         webpackConfig
