更新

node_modules/csso/lib/replace/AttributeSelector.js

@@ -0,0 +1,28 @@
+// Can unquote attribute detection
+// Adopted implementation of Mathias Bynens
+// https://github.com/mathiasbynens/mothereff.in/blob/master/unquoted-attributes/eff.js
+const blockUnquoteRx = /^(-?\d|--)|[\u0000-\u002c\u002e\u002f\u003A-\u0040\u005B-\u005E\u0060\u007B-\u009f]/;
+
+function canUnquote(value) {
+    if (value === '' || value === '-') {
+        return false;
+    }
+
+    return !blockUnquoteRx.test(value);
+}
+
+export default function(node) {
+    const attrValue = node.value;
+
+    if (!attrValue || attrValue.type !== 'String') {
+        return;
+    }
+
+    if (canUnquote(attrValue.value)) {
+        node.value = {
+            type: 'Identifier',
+            loc: attrValue.loc,
+            name: attrValue.value
+        };
+    }
+};