Use PostCSS 6 and Node 4

.travis.yml

@@ -1 +1,3 @@
 language: node_js
+node_js:
+  - 4

index.js

@@ -1,11 +1,13 @@
-var postcss = require("postcss");
+"use strict";
+
+const postcss = require("postcss");
 
 /**
  * font variant convertion map
  *
  * @type {Object}
  */
-var fontVariantProperties = {
+const fontVariantProperties = {
   "font-variant-ligatures": {
     "common-ligatures": "\"liga\", \"clig\"",
     "no-common-ligatures": "\"liga\", \"clig off\"",
@@ -55,9 +57,9 @@ var fontVariantProperties = {
 }
 
 // The `font-variant` property is a shorthand for all the others.
-for (var prop in fontVariantProperties) {
-  var keys = fontVariantProperties[prop]
-  for (var key in keys) {
+for (let prop in fontVariantProperties) {
+  let keys = fontVariantProperties[prop]
+  for (let key in keys) {
     if (!(key in fontVariantProperties["font-variant"])) {
       fontVariantProperties["font-variant"][key] = keys[key]
     }
@@ -67,8 +69,8 @@ for (var prop in fontVariantProperties) {
 // Find font-feature-settings declaration before given declaration,
 // create if does not exist
 function getFontFeatureSettingsPrevTo(decl) {
-  var fontFeatureSettings = null;
-  decl.parent.walkDecls(function(decl) {
+  let fontFeatureSettings = null;
+  decl.parent.walkDecls((decl) => {
     if (decl.prop === "font-feature-settings") {
       fontFeatureSettings = decl;
     }
@@ -86,36 +88,34 @@ function getFontFeatureSettingsPrevTo(decl) {
 /**
  * Expose the font-variant plugin.
  */
-module.exports = postcss.plugin("postcss-font-variant", function() {
-  return function(styles) {
-    styles.walkRules(function(rule) {
-      var fontFeatureSettings = null
-      // read custom media queries
-      rule.walkDecls(function(decl) {
-        if (!fontVariantProperties[decl.prop]) {
-          return null
-        }
+module.exports = postcss.plugin("postcss-font-variant", () => (styles) => {
+  styles.walkRules((rule) => {
+    let fontFeatureSettings = null
+    // read custom media queries
+    rule.walkDecls((decl) => {
+      if (!fontVariantProperties[decl.prop]) {
+        return null
+      }
 
-        var newValue = decl.value
-        if (decl.prop === "font-variant") {
-          newValue = decl.value.split(/\s+/g).map(function(val) {
-            return fontVariantProperties["font-variant"][val]
-          }).join(", ")
-        }
-        else if (fontVariantProperties[decl.prop][decl.value]) {
-          newValue = fontVariantProperties[decl.prop][decl.value]
-        }
+      let newValue = decl.value
+      if (decl.prop === "font-variant") {
+        newValue = decl.value.split(/\s+/g).map(
+          (val) => fontVariantProperties["font-variant"][val]
+        ).join(", ")
+      }
+      else if (fontVariantProperties[decl.prop][decl.value]) {
+        newValue = fontVariantProperties[decl.prop][decl.value]
+      }
 
-        if (fontFeatureSettings === null) {
-          fontFeatureSettings = getFontFeatureSettingsPrevTo(decl);
-        }
-        if (fontFeatureSettings.value && fontFeatureSettings.value !== newValue) {
-          fontFeatureSettings.value += ", " + newValue;
-        }
-        else {
-          fontFeatureSettings.value = newValue;
-        }
-      })
+      if (fontFeatureSettings === null) {
+        fontFeatureSettings = getFontFeatureSettingsPrevTo(decl);
+      }
+      if (fontFeatureSettings.value && fontFeatureSettings.value !== newValue) {
+        fontFeatureSettings.value += ", " + newValue;
+      }
+      else {
+        fontFeatureSettings.value = newValue;
+      }
     })
-  }
+  })
 })

package.json

@@ -20,13 +20,13 @@
     "index.js"
   ],
   "dependencies": {
-    "postcss": "^5.0.4"
+    "postcss": "^6.0.1"
   },
   "devDependencies": {
-    "jscs": "^2.1.0",
-    "jshint": "^2.8.0",
+    "jscs": "^3.0.7",
+    "jshint": "^2.9.4",
     "npmpub": "^3.1.0",
-    "tape": "^4.0.3"
+    "tape": "^4.6.3"
   },
   "scripts": {
     "lint": "npm run jscs && npm run jshint",