Fix for style missing side effects

lib/select.js

@@ -1,3 +1,5 @@
+const hash = require('hash-sum')
+
 module.exports = function selectBlock (
   descriptor,
   loaderContext,
@@ -19,12 +21,29 @@ module.exports = function selectBlock (
 
   // script
   if (query.type === `script`) {
+    let content = descriptor.script.content
     if (appendExtension) {
       loaderContext.resourcePath += '.' + (descriptor.script.lang || 'js')
     }
+    if (/\.vue$/.test(loaderContext.resourcePath)) {
+      const filePath = loaderContext.resourcePath.replace(loaderContext.rootContext, '').slice(1)
+      const id = hash(filePath)
+      const imports = descriptor.styles.map((style, $index) => {
+        const styleImportName = `style${id}_${$index}`
+        const lang = style.lang || 'css'
+        const module = style.module || false
+        const scoped = style.scoped || false
+        const importStr = `import ${styleImportName} from '${loaderContext.resourcePath}?vue&type=style&index=${$index}&id=${id}&module=${module}&lang=${lang}&scoped=${scoped}&'`
+        const forceSideEffect = `if(typeof ${styleImportName} === 'NEVERTRUE') ${styleImportName}();`
+        return { importStr, forceSideEffect }
+      })
+      const importStr = imports.map(imp => imp.importStr).join('\n')
+      const forceSideEffect = imports.map(imp => imp.forceSideEffect).join('\n')
+      content = `${importStr}\n${content}\n${forceSideEffect}\n`
+    }
     loaderContext.callback(
       null,
-      descriptor.script.content,
+      content,
       descriptor.script.map
     )
     return

test/style.spec.js

@@ -215,7 +215,7 @@ test('CSS Modules Extend', async () => {
       const vnode = mockRender(module)
       expect(vnode.data.class).toBe(instance.$style.red)
 
-      const style = window.document.querySelectorAll('style')[1].textContent
+      const style = [...window.document.querySelectorAll('style')].map(style => style.textContent).join('\n')
       expect(style).toContain(`.${instance.$style.red} {\n  color: #FF0000;\n}`)
 
       resolve()