BREAKING: Break TS build that uses functions.config()

Author: taeold

spec/v1/config.spec.ts

@@ -26,11 +26,14 @@ import { config } from "../../src/v1/config";
 
 describe("config()", () => {
   it("throws an error with migration guidance", () => {
-    expect(config).to.throw(
+    expect(() => {
+      // @ts-expect-error - config is deprecated and typed as never to cause a build error
+      config();
+    }).to.throw(
       Error,
       "functions.config() has been removed in firebase-functions v7. " +
         "Migrate to environment parameters using the params module. " +
         "Migration guide: https://firebase.google.com/docs/functions/config-env#migrate-config"
     );
   });
-});
+});

src/v1/config.ts

@@ -27,10 +27,10 @@ export { firebaseConfig } from "../common/config";
  * Migrate to environment parameters using the `params` module immediately.
  * Migration guide: https://firebase.google.com/docs/functions/config-env#migrate-config
  */
-export function config(): Record<string, any> {
+export const config: never = (() => {
   throw new Error(
     "functions.config() has been removed in firebase-functions v7. " +
       "Migrate to environment parameters using the params module. " +
       "Migration guide: https://firebase.google.com/docs/functions/config-env#migrate-config"
   );
-}
+}) as unknown as never;