types.d.ts is not being automatically included in every TypeScript file

I've noticed that the types.d.ts file in the root of the project was automatically included in every TypeScript file in my project. I didn't have to write import type {...} from "./types.d.ts"; in every file manually, which is a very convenient feature.

But recently, that stopped being the case. VSCode shows errors when not writing the line above. What did I do? Could it be something with my tsconfig.json? More importantly, how do I get it back?

{
    "compilerOptions": {
        "target": "ESNext",
        "module": "ESNext",
        "moduleResolution": "Node",
        "strict": true,
        "esModuleInterop": true,
        "skipLibCheck": true,
        "forceConsistentCasingInFileNames": true,
        "paths": {
            "*": [
                "./node_modules/*"
            ]
        },
        "types": ["./types.d.ts"],
        "rewriteRelativeImportExtensions": true
    }
}

I manually included .ts extensions in import modules because at first I used tsc, which outputted the built files in the same place as the normal files, but that's beyond the scope of my question.
Also, I have not tried compiling without the ./types.d.ts import. The problem I have as of now is with VSCode.

Extra context: I can't provide types.d.ts because of privacy reasons, but I do have one import in it:

import { CacheType, ChatInputCommandInteraction } from "discord.js/typings";

Change your import to:

type CacheType = import("discord.js/typings").CacheType;

type ChatInputCommandInteraction = import("discord.js/typings").ChatInputCommandInteraction;

I believe that if you use an import statement, the declaration is no longer treated as an ambient module, and therefore isn't available everywhere.