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node_modules/vue-loader/lib/style-compiler/plugins/scope-id.js

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+var postcss = require('postcss')
+var selectorParser = require('postcss-selector-parser')
+
+module.exports = postcss.plugin('add-id', function (opts) {
+  return function (root) {
+    root.each(function rewriteSelector (node) {
+      if (!node.selector) {
+        // handle media queries
+        if (node.type === 'atrule' && node.name === 'media') {
+          node.each(rewriteSelector)
+        }
+        return
+      }
+      node.selector = selectorParser(function (selectors) {
+        selectors.each(function (selector) {
+          var node = null
+          selector.each(function (n) {
+            if (n.type !== 'pseudo') node = n
+          })
+          selector.insertAfter(node, selectorParser.attribute({
+            attribute: opts.id
+          }))
+        })
+      }).process(node.selector).result
+    })
+  }
+})

node_modules/vue-loader/lib/style-compiler/plugins/trim.js

@@ -0,0 +1,11 @@
+var postcss = require('postcss')
+
+module.exports = postcss.plugin('trim', function (opts) {
+  return function (css) {
+    css.walk(function (node) {
+      if (node.type === 'rule' || node.type === 'atrule') {
+        node.raws.before = node.raws.after = '\n'
+      }
+    })
+  }
+})