add checkConfiguration()

index.js

@@ -131,6 +131,8 @@ function parse (args, opts) {
     })
   })
 
+  checkConfiguration()
+
   var argv = { _: [] }
   var notFlags = []
 
@@ -874,6 +876,20 @@ function parse (args, opts) {
     return num === undefined
   }
 
+  // check user configuration settings for inconsistencies
+  function checkConfiguration () {
+    // count keys should not be set as array/narg
+    Object.keys(flags.counts).find(key => {
+      if (checkAllAliases(key, flags.arrays)) {
+        error = Error(__('Invalid configuration: %s is set as count and array', key))
+        return true
+      } else if (checkAllAliases(key, flags.nargs)) {
+        error = Error(__('Invalid configuration: %s is set as count and narg', key))
+        return true
+      }
+    })
+  }
+
   return {
     argv: argv,
     error: error,