unresolved alias in mdx files (3.7.0 works, 3.8.x fails)

[chrisweb]

I created a reproduction for a Next.js project with support for MDX files: https://github.com/chrisweb/eslint-import-resolver-typescript_mdx_reproduction

After migrating to eslint-import-resolver-typescript 3.8.x a new "import/no-unresolved" linting error started to appear

It could be related to #363 (if there is a PR to fix 363 I will check if it also solves the problem mentioned here)

I was hoping the #360 PR (from the #359 ticket) would fix the problem but it did not

[JounQin]

cc @carlocorradini

[carlocorradini]

@chrisweb
We throw the error because the .mdx file is not present in your tsconfig.json and has not been mapped.
A possible solution (future fix) is provided in #363 (comment), but I have not received any feedback.

Temporary fix:

--- a/tsconfig.json
+++ b/tsconfig.json
@@ -32,6 +32,7 @@
       "next-env.d.ts",
       "**/*.ts",
       "**/*.tsx",
+      "**/*.mdx",
       ".next/types/**/*.ts"
   ],
   "exclude": [

[carlocorradini]

@JounQin We can close this. Duplicate of #363

[JounQin]

Duplicate of #363