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node_modules/@vue/vue-loader-v15/lib/codegen/utils.js

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+const qs = require('querystring')
+
+// these are built-in query parameters so should be ignored
+// if the user happen to add them as attrs
+const ignoreList = ['id', 'index', 'src', 'type']
+
+// transform the attrs on a SFC block descriptor into a resourceQuery string
+exports.attrsToQuery = (attrs, langFallback) => {
+  let query = ``
+  for (const name in attrs) {
+    const value = attrs[name]
+    if (!ignoreList.includes(name)) {
+      query += `&${qs.escape(name)}=${value ? qs.escape(value) : ``}`
+    }
+  }
+  if (langFallback && !(`lang` in attrs)) {
+    query += `&lang=${langFallback}`
+  }
+  return query
+}