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node_modules/vue/packages/compiler-sfc/src/stylePlugins/trim.ts

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+import { PluginCreator } from 'postcss'
+
+const trimPlugin: PluginCreator<{}> = () => {
+  return {
+    postcssPlugin: 'vue-sfc-trim',
+    Once(root) {
+      root.walk(({ type, raws }) => {
+        if (type === 'rule' || type === 'atrule') {
+          if (raws.before) raws.before = '\n'
+          if ('after' in raws && raws.after) raws.after = '\n'
+        }
+      })
+    }
+  }
+}
+
+trimPlugin.postcss = true
+export default trimPlugin