fix(serve): Support dynamically set userData path

Author: nklayman

lib/installVueDevtools/index.js

@@ -8,10 +8,10 @@ import { getPath } from './utils'
 const { BrowserWindow } = remote || electron
 
 let IDMap = {}
-const IDMapPath = path.resolve(getPath(), 'IDMap.json')
-if (fs.existsSync(IDMapPath)) {
+const getIDMapPath = () => path.resolve(getPath(), 'IDMap.json')
+if (fs.existsSync(getIDMapPath())) {
   try {
-    IDMap = JSON.parse(fs.readFileSync(IDMapPath, 'utf8'))
+    IDMap = JSON.parse(fs.readFileSync(getIDMapPath(), 'utf8'))
   } catch (err) {
     console.error(
       'electron-devtools-installer: Invalid JSON present in the IDMap file'
@@ -38,7 +38,7 @@ const install = (forceDownload = false) => {
         }
         const name = BrowserWindow.addDevToolsExtension(extensionFolder) // eslint-disable-line
         fs.writeFileSync(
-          IDMapPath,
+          getIDMapPath(),
           JSON.stringify(
             Object.assign(IDMap, {
               [chromeStoreID]: name