Fix scheme validation failing in some edge cases

Author: SpaceK33z

lib/OptionsValidationError.js

@@ -34,6 +34,8 @@ OptionsValidationError.formatValidationError = function formatValidationError(er
 			switch(err.params.type) {
 				case "object":
 					return dataPath + " should be an object.";
+				case "array":
+					return dataPath + " should be an array.";
 				case "string":
 					return dataPath + " should be a string.";
 				case "boolean":
@@ -43,6 +45,8 @@ OptionsValidationError.formatValidationError = function formatValidationError(er
 			}
 			return dataPath + " should be " + err.params.type + ":\n" +
 				getSchemaPartText(err.parentSchema);
+		case "instanceof":
+			return dataPath + " should be an instance of " + getSchemaPartText(err.parentSchema) + ".";
 		case "required":
 			var missingProperty = err.params.missingProperty.replace(/^\./, "");
 			return dataPath + " misses the property '" + missingProperty + "'.\n" +

lib/optionsSchema.json

@@ -127,8 +127,15 @@
       "description": "A directory to serve files non-webpack files from.",
       "anyOf": [
         {
+          "items": {
+            "type": "string"
+          },
+          "minItems": 1,
           "type": "array"
         },
+        {
+          "type": "boolean"
+        },
         {
           "type": "number"
         },
@@ -147,6 +154,9 @@
     },
     "features": {
       "description": "The order of which the features will be triggered.",
+      "items": {
+        "type": "string"
+      },
       "type": "array"
     },
     "compress": {