chore: update schema

package.json

@@ -24,7 +24,7 @@
     "loader-runner": "^4.2.0",
     "mime-types": "^2.1.27",
     "neo-async": "^2.6.2",
-    "schema-utils": "^3.1.2",
+    "schema-utils": "^3.2.0",
     "tapable": "^2.1.1",
     "terser-webpack-plugin": "^5.3.7",
     "watchpack": "^2.4.0",

schemas/WebpackOptions.json

@@ -1150,7 +1150,8 @@
       "cli": {
         "exclude": true
       },
-      "enum": [false, 0, "", null]
+      "enum": [false, 0, "", null],
+      "undefinedAsNull": true
     },
     "FileCacheOptions": {
       "description": "Options object for persistent file-based caching.",

test/configCases/loaders-and-plugins-falsy/basic/webpack.config.js

@@ -1,8 +1,7 @@
 var DefinePlugin = require("../../../../").DefinePlugin;
 
 const nullValue = null;
-// TODO fix me
-const undefinedValue = null;
+const undefinedValue = undefined;
 const falseValue = false;
 const zeroValue = 0;
 const emptyStringValue = "";

yarn.lock

@@ -5554,10 +5554,10 @@ schema-utils@^2.6.5:
     ajv "^6.12.4"
     ajv-keywords "^3.5.2"
 
-schema-utils@^3.0.0, schema-utils@^3.1.1, schema-utils@^3.1.2:
-  version "3.1.2"
-  resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-3.1.2.tgz#36c10abca6f7577aeae136c804b0c741edeadc99"
-  integrity sha512-pvjEHOgWc9OWA/f/DE3ohBWTD6EleVLf7iFUkoSwAxttdBhB9QUebQgxER2kWueOvRJXPHNnyrvvh9eZINB8Eg==
+schema-utils@^3.0.0, schema-utils@^3.1.1, schema-utils@^3.2.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-3.2.0.tgz#7dff4881064a4f22c09f0c6a1457feb820fd0636"
+  integrity sha512-0zTyLGyDJYd/MBxG1AhJkKa6fpEBds4OQO2ut0w7OYG+ZGhGea09lijvzsqegYSik88zc7cUtIlnnO+/BvD6gQ==
   dependencies:
     "@types/json-schema" "^7.0.8"
     ajv "^6.12.5"