npm and error messages

node_modules/csso/lib/compressor/compress/String.js

@@ -0,0 +1,12 @@
+module.exports = function(node) {
+    var value = node.value;
+
+    // remove escaped \n, i.e.
+    // .a { content: "foo\
+    // bar"}
+    // ->
+    // .a { content: "foobar" }
+    value = value.replace(/\\\n/g, '');
+
+    node.value = value;
+};