import { onDocumentCreated } from "firebase-functions/v2/firestore";
import { defineString } from "firebase-functions/params";

const databaseName = defineString("FIRESTORE_DATABASE_NAME");

export const myFunction = onDocumentCreated(
  {
    database: databaseName,
    document: `myCollection/{documentId}`,
  },
  async (event: any) => {
    console.log('event', event);
  }
);

export interface DocumentOptions<Document extends string = string> extends EventHandlerOptions {
    /** The document path */
    document: Document | Expression<Document>;
    /** The Firestore database */
    database?: string | Expression<string>;
    /** The Firestore namespace */
    namespace?: string | Expression<string>;
}

export interface DocumentOptions<Document extends string = string> extends EventHandlerOptions {
    /** The document path */
    document: Document;
    /** The Firestore database */
    database?: string;
    /** The Firestore namespace */
    namespace?: string;
}

 error TS2769: No overload matches this call.
  Overload 1 of 2, '(document: string, handler: (event: FirestoreEvent<QueryDocumentSnapshot | undefined, Record<string, string>>) => any): CloudFunction<...>', gave the following error.
    Argument of type '{ database: StringParam; document: string; }' is not assignable to parameter of type 'string'.
  Overload 2 of 2, '(opts: DocumentOptions<"myCollection/{documentId}">, handler: (event: FirestoreEvent<QueryDocumentSnapshot | undefined, { documentId: string; }>) => any): CloudFunction<...>', gave the following error.
    Type 'StringParam' is not assignable to type 'string'.

export const myFunction = onDocumentCreated(
  {
    database: databaseName as any,
    document: `myCollection/{documentId}`,
  },
  async (event: any) => {
    console.log('event', event);
  }
);