feat(v2): Implement proof-of-concept Docusaurus Debug Dashboard (#2928)

* feat(v2): Implement proof-of-concept Docusaurus Debug Dashboard

* Ensure we show the exact boolean

packages/docusaurus-plugin-debug/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "@docusaurus/plugin-debug",
+  "version": "2.0.0-alpha.56",
+  "description": "Debug plugin for Docusaurus",
+  "main": "lib/index.js",
+  "scripts": {
+    "tsc": "tsc"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "license": "MIT",
+  "dependencies": {
+    "@docusaurus/types": "^2.0.0-alpha.56",
+    "@docusaurus/utils": "^2.0.0-alpha.56"
+  },
+  "peerDependencies": {
+    "@docusaurus/core": "^2.0.0",
+    "react": "^16.8.4",
+    "react-dom": "^16.8.4"
+  },
+  "engines": {
+    "node": ">=10.15.1"
+  }
+}

packages/docusaurus-plugin-debug/src/index.ts

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import {LoadContext, Plugin} from '@docusaurus/types';
+import {normalizeUrl} from '@docusaurus/utils';
+
+import path from 'path';
+
+export default function pluginContentPages({
+  siteConfig: {baseUrl},
+}: LoadContext): Plugin<void> {
+  return {
+    name: 'docusaurus-plugin-debug',
+
+    getThemePath() {
+      return path.resolve(__dirname, '../src/theme');
+    },
+
+    contentLoaded({actions: {addRoute}}) {
+      addRoute({
+        path: normalizeUrl([baseUrl, '__docusaurus/debug']),
+        component: '@theme/Debug',
+        exact: true,
+      });
+    },
+  };
+}

packages/docusaurus-plugin-debug/src/theme/Debug/index.js

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import Layout from '@theme/Layout';
+
+import registry from '@generated/registry';
+import routes from '@generated/routes';
+
+import styles from './styles.module.css';
+
+function Debug() {
+  return (
+    <Layout permalink="__docusaurus/debug" title="Debug">
+      <main className={styles.Container}>
+        <section>
+          <h2>Registry</h2>
+          <ul>
+            {Object.values(registry).map(([, aliasedPath, resolved]) => (
+              <li key={aliasedPath}>
+                <div>Aliased Path: {aliasedPath}</div>
+                <div>Resolved Path: {resolved}</div>
+              </li>
+            ))}
+          </ul>
+        </section>
+        <section>
+          <h2>Routes</h2>
+          <ul>
+            {routes.map(({path, exact}) => (
+              <li key={path}>
+                <div>Route: {path}</div>
+                <div>Is exact: {String(Boolean(exact))}</div>
+              </li>
+            ))}
+          </ul>
+        </section>
+      </main>
+    </Layout>
+  );
+}
+
+export default Debug;

packages/docusaurus-plugin-debug/src/theme/Debug/styles.module.css

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+.Container {
+  display: flex;
+  margin: 1em;
+}

packages/docusaurus-plugin-debug/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "incremental": true,
+    "tsBuildInfoFile": "./lib/.tsbuildinfo",
+    "rootDir": "src",
+    "outDir": "lib"
+  }
+}