How to export multiple databases in Deno?-CodePudding

I have a code like this:

import { MongoClient } from "./deps.ts";

const client = new MongoClient();
await client.connect(Deno.env.get("MONGODB_URI") || "");

const first_db = client.database(Deno.env.get("DB1_NAME") || "");
const second_db = client.database(Deno.env.get("DB2_NAME") || "");

export default  first_db;
export  second_db;


export const firstCollection = first_db.collection("first");
export const secondCollection = second_db.collection("second");

This line of the code export second_db; doesn't work and if I add const before second_db it gives me another following error:

Cannot redeclare block-scoped variable 'second_db'.deno-ts(2451) 'const' declarations must be initialized.deno-ts(1155) Variable 'second_db' implicitly has an 'any' type.

I don't know how to export multiple databases?

Also I want to know what is the difference between a database it has default type and the other databases they don't have it?

CodePudding user response：

Here's the documentation for valid export syntax.

You can apply it to your situation like this. Let's say your module that includes the exports is called ./module.ts:

export const first_db = 'some value';
export const second_db = 'some value';
export default first_db;

const first_db = 'some value';
const second_db = 'some value';

export {
  default as first_db,
  first_db,
  second_db,
};

Then, you can import them in another module like this:

import {first_db, second_db} from './module.ts';

// OR

import first_db, {second_db} from './module.ts';

// OR

import {default as first_db, second_db} from './module.ts';