更新

node_modules/css-loader/dist/runtime/sourceMaps.js

@@ -0,0 +1,16 @@
+"use strict";
+
+module.exports = function (item) {
+  var content = item[1];
+  var cssMapping = item[3];
+  if (!cssMapping) {
+    return content;
+  }
+  if (typeof btoa === "function") {
+    var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(cssMapping))));
+    var data = "sourceMappingURL=data:application/json;charset=utf-8;base64,".concat(base64);
+    var sourceMapping = "/*# ".concat(data, " */");
+    return [content].concat([sourceMapping]).join("\n");
+  }
+  return [content].join("\n");
+};