Let "warnings" option silence all warnings.

Author: bundyo

index.js

@@ -14,10 +14,16 @@ var VAR_FUNC_IDENTIFIER = "var"
 // matches `name[, fallback]`, captures "name" and "fallback"
 var RE_VAR = /([\w-]+)(?:\s*,\s*)?\s*(.*)?/
 
+/**
+ * Module variables
+ */
+
+var warnings
+
 /**
  * Resolve CSS variables.
  *
- * The second argument to the CSS variable function, var(name[, fallback]), 
+ * The second argument to the CSS variable function, var(name[, fallback]),
  * is used in the event that first argument cannot be resolved.
  *
  * @param {String} value May contain the CSS variable function
@@ -50,10 +56,12 @@ function resolveValue(value, variables, result, decl) {
     var post
     // undefined and without fallback, just keep original value
     if (!variable && !fallback) {
-      result.warn(
-        "variable '" + name + "' is undefined and used without a fallback",
-        {node: decl}
-      )
+      if (warnings) {
+        result.warn(
+          "variable '" + name + "' is undefined and used without a fallback",
+          {node: decl}
+        )
+      }
       post = matches.post
         ? resolveValue(matches.post, variables, result, decl)
         : [""]
@@ -91,7 +99,9 @@ function resolveValue(value, variables, result, decl) {
       // circular reference encountered
       if (variable.deps.indexOf(name) !== -1) {
         if (!fallback) {
-          result.warn("Circular variable reference: " + name, {node: decl})
+          if (warnings) {
+            result.warn("Circular variable reference: " + name, {node: decl})
+          }
           variable.value = [variable.value]
           variable.circular = true
         }
@@ -153,14 +163,15 @@ module.exports = postcss.plugin("postcss-custom-properties", function(options) {
   }
 
   function plugin(style, result) {
-    var warnings = options.warnings === undefined ? true : options.warnings
     var variables = prefixVariables(options.variables)
     var strict = options.strict === undefined ? true : options.strict
     var appendVariables = options.appendVariables
     var preserve = options.preserve
     var map = {}
     var importantMap = {}
 
+    warnings = options.warnings === undefined ? true : options.warnings
+
     // define variables
     style.walkRules(function(rule) {
       var toRemove = []