Cannot connect mongoose with express rest api - node.js

Question

I'm trying to create a rest api with express and connect to mongodb, I create a script to do the job and import it in the app.js file :
app.js
import express from 'express'
import morgan from 'morgan'
import dotenv from 'dotenv'
import mongoose from './config/mongoose.connection.js'
import logger from './config/logger.js'
import { port, env } from './config/vars.js'
const app = express();
app.use(express.urlencoded({
extended: true
}));
app.use(dotenv.config)
// start server
app.listen(port, () => {
logger.info(`server started on port ${port} (${env})`)
console.log('Server listening on port ' + port);
});
// open mongoose connection
mongoose.connectDB();
mongoose.connection.js
import { Promise as _Promise, connection, set, connect } from 'mongoose';
import { error } from './logger.js';
import { mongo, env } from './vars.js';
// set mongoose Promise to Bluebird
_Promise = Promise;
// Exit application on error
connection.on('error', (err) => {
error(`MongoDB connection error: ${err}`);
process.exit(-1);
});
// print mongoose logs in dev env
if (env === 'development') {
set('debug', true);
}
/**
* Connect to mongo db
*
* #returns {object} Mongoose connection
* #public
*/
export function connect() {
connect(mongo.uri, {
useCreateIndex: true,
keepAlive: 1,
useNewUrlParser: true,
useUnifiedTopology: true,
useFindAndModify: false,
})
.then(() => console.log('mongoDB connected...'));
return connection;
}
when run the app I got this error :
file:///home/sahnoun/Documents/Fwinr-BACKEND/src/config/mongoose.connection.js:25
export function connect() {
^
SyntaxError: Identifier 'connect' has already been declared

Answer 1

Always look at the error which is explicit enough in that case:
connect' has already been declared
You can see that you are importing the function connect as well as exporting a function named connect. Just rename your function.
export function connectToMongo() {
connect(mongo.uri, {
useCreateIndex: true,
keepAlive: 1,
useNewUrlParser: true,
useUnifiedTopology: true,
useFindAndModify: false,
})
.then(() => console.log('mongoDB connected...'));
return connection;
}
Bonus
If you want to keep your function name connect, then in the import, use something like:
import { Promise as _Promise, connection, set, connect as connectToMongo } from 'mongoose';
export function connect() {
connectToMongo(mongo.uri, {
...