Index: node_modules/postcss/lib/symbols.js
===================================================================
--- node_modules/postcss/lib/symbols.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
+++ node_modules/postcss/lib/symbols.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
@@ -0,0 +1,5 @@
+'use strict'
+
+module.exports.isClean = Symbol('isClean')
+
+module.exports.my = Symbol('my')