Be more vocal about not doing type checking (#23397)
Be more vocal about not doing type checking (#23397)

I hope this isn't too heavy-handed, but I think that philosophically, this plugin doesn't provide "support" for typescript at all, it just disables it. Typescript _is_ type checking! I admit I don't really understand the purpose of this plugin, but I'm aware of a great number of people who were tricked by this into thinking gatsby was doing type checking on build after installing this plugin.
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