I ❤️ Code Spell Checker plugin for VS Code. It has led to fewer stupid mistakes in my code.
I've been working a lot with MDX and I realized that the spell checker wasn't working. I wasn't sure if I disabled it globally. I re-enabled it, but that didn't seem to fix the trick.
Eventually I found that the issue was that mdx was not in the list of languages that the plugin (cSpell) was targeting.
Here's how to fix it:
Option #1: The UI Way
You can find this in your user or workspace settings as C Spell: Enabled Language Ids.
Scroll to the bottom of the list and add mdx (or the language that isn't working for you).
Option #2: The JSON Way
Or in your JSON user or workspace settings, adjust the value of cSpell.enabledLanguageIds to include the language causing the issue.
Note that if you do this, you'll want to include all the other languages you want targeted. Using this setting overrides all the defaults.