fix: Default lang value for script blocks (#424)

Co-authored-by: Guillaume Chau <[email protected]>

Author: ackzell

packages/vue-component/plugin/tag-handler.js

@@ -72,6 +72,12 @@ VueComponentTagHandler = class VueComponentTagHandler {
 
       maps.push(generateSourceMap(inputFilePath, source, script, getLineNumber(source, sfcBlock.start)))
 
+      // treating the <script> default as if it were `lang="js"`
+      // since some tools (like meteor-vuetify-loader) require to have the attribute present to work
+      if (sfcBlock.type === 'script' && !sfcBlock.lang) {
+        sfcBlock.lang = 'js'
+      }
+      
       // Lang
       if (sfcBlock.lang !== undefined) {
         let lang = sfcBlock.lang