Index: node_modules/autoprefixer/lib/hacks/display-flex.js
===================================================================
--- node_modules/autoprefixer/lib/hacks/display-flex.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
+++ node_modules/autoprefixer/lib/hacks/display-flex.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
@@ -0,0 +1,65 @@
+let OldValue = require('../old-value')
+let Value = require('../value')
+let flexSpec = require('./flex-spec')
+
+class DisplayFlex extends Value {
+  constructor(name, prefixes) {
+    super(name, prefixes)
+    if (name === 'display-flex') {
+      this.name = 'flex'
+    }
+  }
+
+  /**
+   * Faster check for flex value
+   */
+  check(decl) {
+    return decl.prop === 'display' && decl.value === this.name
+  }
+
+  /**
+   * Change value for old specs
+   */
+  old(prefix) {
+    let prefixed = this.prefixed(prefix)
+    if (!prefixed) return undefined
+    return new OldValue(this.name, prefixed)
+  }
+
+  /**
+   * Return value by spec
+   */
+  prefixed(prefix) {
+    let spec, value
+    ;[spec, prefix] = flexSpec(prefix)
+
+    if (spec === 2009) {
+      if (this.name === 'flex') {
+        value = 'box'
+      } else {
+        value = 'inline-box'
+      }
+    } else if (spec === 2012) {
+      if (this.name === 'flex') {
+        value = 'flexbox'
+      } else {
+        value = 'inline-flexbox'
+      }
+    } else if (spec === 'final') {
+      value = this.name
+    }
+
+    return prefix + value
+  }
+
+  /**
+   * Add prefix to value depend on flebox spec version
+   */
+  replace(string, prefix) {
+    return this.prefixed(prefix)
+  }
+}
+
+DisplayFlex.names = ['display-flex', 'inline-flex']
+
+module.exports = DisplayFlex