Allow non-lowercase values in font, font-family, Sass variables starting with polaris, Sass/CSS variables containing font

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Changelog
 
-<!-- ## [Unreleased] -->
+## [Unreleased]
+
+- Allow non-lowercase values in properties such as `font`, `font-family`, `--anything-with-font-in-its-name`, or Sass variables starting with `$polaris` or containing `font` ([#49](https://github.com/Shopify/stylelint-config-shopify/pull/49))
 
 ## [7.1.0] - 2019-01-07
 

rules/value.js

@@ -1,6 +1,17 @@
 module.exports = {
   // Specify lowercase or uppercase for keywords values.
-  'value-keyword-case': 'lower',
+  'value-keyword-case': [
+    'lower',
+    {
+      ignoreProperties: [
+        'font',
+        'font-family',
+        /^--.*font/,
+        /^\$.*font/,
+        /^\$polaris/,
+      ],
+    },
+  ],
   // Require a newline or disallow whitespace after the commas of value lists.
   'value-list-comma-newline-after': 'always-multi-line',
   // Require a newline or disallow whitespace before the commas of value lists.