add mdx example

MDX example to validate regression of [#117]

[#117]: #117

.gitattributes

@@ -1,12 +1,6 @@
-/.yarn/releases/**   linguist-vendored
-/.yarn/plugins/**    linguist-vendored
-/.yarn/cache/**      linguist-vendored
-/.yarn/sdks/**       linguist-vendored
-/.yarn/pnpify/**     linguist-vendored
-
-/.pnp.js             binary linguist-generated
-/.pnp.cjs            binary linguist-generated
+/.yarn/**            linguist-vendored
+/.pnp.*              binary linguist-generated
 
 /.vscode/*.json      linguist-language=JSON5
 
-__generated__        linguist-generated
+**/__generated__/**  linguist-generated

examples/mdx/.gitignore

@@ -0,0 +1,2 @@
+public/
+.cache/

examples/mdx/gatsby-config.ts

@@ -0,0 +1,37 @@
+import type { GatsbyConfig } from 'gatsby';
+
+const config: GatsbyConfig = {
+  siteMetadata: {
+    title: 'gatsby-plugin-typegen example',
+    description: 'gatsby-plugin-typegen example with TypeScript',
+  },
+  plugins: [
+    'gatsby-plugin-react-helmet-async',
+    'gatsby-plugin-image',
+    {
+      resolve: 'gatsby-source-filesystem',
+      options: {
+        name: 'images',
+        path: 'src/images',
+      },
+    },
+    'gatsby-transformer-sharp',
+    'gatsby-plugin-sharp',
+    'gatsby-plugin-mdx',
+    {
+      resolve: 'gatsby-plugin-typegen',
+      options: {
+        outputPath: 'src/__generated__/gatsby-types.d.ts',
+        emitSchema: {
+          'src/__generated__/gatsby-introspection.json': true,
+          'src/__generated__/gatsby-schema.graphql': true,
+        },
+        emitPluginDocument: {
+          'src/__generated__/gatsby-plugin-documents.graphql': true,
+        },
+      },
+    },
+  ],
+};
+
+export default config;

examples/mdx/package.json

@@ -0,0 +1,36 @@
+{
+  "name": "example-mdx",
+  "private": true,
+  "description": "gatsby-plugin-typegen example with MDX",
+  "version": "0.1.0",
+  "author": {
+    "name": "Hyeseong Kim",
+    "email": "[email protected]"
+  },
+  "scripts": {
+    "build": "gatsby build",
+    "develop": "gatsby develop",
+    "serve": "gatsby serve",
+    "clean": "gatsby clean"
+  },
+  "dependencies": {
+    "@mdx-js/mdx": "v1",
+    "@mdx-js/react": "v1",
+    "gatsby": "^4.9.3",
+    "gatsby-plugin-image": "^2.9.1",
+    "gatsby-plugin-mdx": "^3.16.1",
+    "gatsby-plugin-react-helmet": "^5.9.0",
+    "gatsby-plugin-react-helmet-async": "^1.2.1",
+    "gatsby-plugin-sharp": "^4.9.1",
+    "gatsby-plugin-typegen": "portal:../../plugin",
+    "gatsby-source-filesystem": "^4.9.1",
+    "gatsby-transformer-sharp": "^4.9.0",
+    "react": "^17.0.1",
+    "react-dom": "^17.0.1",
+    "react-helmet-async": "^1.2.3"
+  },
+  "devDependencies": {
+    "@types/react": "^17.0.40",
+    "typescript": "^4.6.2"
+  }
+}