Index: node_modules/autoprefixer/lib/hacks/animation.js
===================================================================
--- node_modules/autoprefixer/lib/hacks/animation.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
+++ node_modules/autoprefixer/lib/hacks/animation.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
@@ -0,0 +1,17 @@
+let Declaration = require('../declaration')
+
+class Animation extends Declaration {
+  /**
+   * Don’t add prefixes for modern values.
+   */
+  check(decl) {
+    return !decl.value.split(/\s+/).some(i => {
+      let lower = i.toLowerCase()
+      return lower === 'reverse' || lower === 'alternate-reverse'
+    })
+  }
+}
+
+Animation.names = ['animation', 'animation-direction']
+
+module.exports = Animation