Fix next warnings when building starter project (anza-xyz#765)

* Fix next warnings when building starter project

* Update .changeset/thick-tomatoes-pretend.md

---------

Co-authored-by: Jordan Sexton <jordan@jordansexton.com>

Author: mikemaccana

.changeset/thick-tomatoes-pretend.md

@@ -0,0 +1,5 @@
+---
+'@solana/wallet-adapter-example': patch
+---
+
+Fix next.js warnings when building starter project

packages/starter/example/next.config.js

@@ -1,24 +1,23 @@
-/* eslint-disable @typescript-eslint/no-var-requires */
-const plugins = require('next-compose-plugins');
-const antdLess = require('next-plugin-antd-less');
+const withAntdLess = require('next-plugin-antd-less');
 const { PHASE_PRODUCTION_BUILD } = require('next/constants');
 
-module.exports = function (phase, ...args) {
-    return plugins(
-        [
-            [
-                antdLess,
-                {
-                    modifyVars: {
-                        '@background': '#303030',
-                        '@primary-color': '#512da8',
-                    },
-                },
-            ],
-        ],
-        {
-            reactStrictMode: true,
-            basePath: phase === PHASE_PRODUCTION_BUILD ? '/wallet-adapter/example' : '',
-        }
-    )(phase, ...args);
+const COLORS = {
+    GREY: '#303030',
+    PURPLE: '#512da8',
+};
+
+module.exports = function (phase, { defaultConfig }) {
+    // See https://github.com/SolidZORO/next-plugin-antd-less
+    const config = withAntdLess({
+        // Note this produces an unnecessary warning:
+        // 'The root value has an unexpected property, modifyVars'
+        // See https://github.com/SolidZORO/next-plugin-antd-less/issues/105
+        modifyVars: {
+            '@background': COLORS.GREY,
+            '@primary-color': COLORS.PURPLE,
+        },
+        basePath: phase === PHASE_PRODUCTION_BUILD ? '/wallet-adapter/example' : '',
+    });
+
+    return config;
 };

packages/starter/example/package.json

@@ -61,7 +61,6 @@
         "@types/react-dom": "^18.0.11",
         "eslint": "8.22.0",
         "eslint-config-next": "^12.3.4",
-        "next-compose-plugins": "^2.2.1",
         "next-plugin-antd-less": "^1.8.0",
         "prettier": "^2.8.4",
         "shx": "^0.3.4",