add types files to eslint ignore list

Author: lobsterkatie

packages/gatsby/.eslintrc.js

@@ -6,8 +6,7 @@ module.exports = {
   parserOptions: {
     jsx: true,
   },
-  // ignoring the package-specific prepack script here b/c it is not
-  // covered by a `tsconfig` which makes eslint throw an error
-  ignorePatterns: ['scripts/prepack.ts'],
+  // ignore these because they're not covered by a `tsconfig`, which makes eslint throw an error
+  ignorePatterns: ['scripts/prepack.ts', 'gatsby-browser.d.ts', 'gatsby-node.d.ts'],
   extends: ['../../.eslintrc.js'],
 };