Setup project

.editorconfig

+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+trim_trailing_whitespace = true
+insert_final_newline = true

babel.config.js

+module.exports = {
+  presets: [
+    '@babel/preset-typescript',
+    'babel-preset-gatsby-package',
+  ],
+};

package.json

+{
+  "name": "gatsby-plugin-typegen",
+  "version": "1.0.0",
+  "main": "index.js",
+  "repository": "https://github.com/cometkim/gatsby-plugin-typegen.git",
+  "author": "Hyeseong Kim <cometkim.kr@gmail.com>",
+  "license": "MIT",
+  "peerDependencies": {
+    "gatsby": ">=2.0.0"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.5.5",
+    "@babel/core": "^7.5.5",
+    "@babel/preset-typescript": "^7.3.3",
+    "babel-preset-gatsby-package": "^0.2.3",
+    "typescript": "^3.5.3"
+  }
+}

tsconfig.json

+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "strict": true,
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true
+  }
+}