I hae the following code in a TS file:

export const authConfig: NextAuthOptions = {
  providers: [
    DiscordProvider({
      clientId: process.env.CLIENT_ID,
      clientSecret: process.env.CLIENT_SECRET,
      authorization: "https://discord.com/api/oauth2/authorize?scope=identify"
    })
  ]
};

However I'm getting this error: Type 'undefined' is not assignable to type 'string' even though I created a typings.d.ts file with the following inside:

declare global {
  namespace NodeJS {
    interface ProcessEnv {
      CLIENT_ID: string;
      CLIENT_SECRET: string;
    }
  }
}