The database connections array for Nest.js - https://blog.entrostat.com/setting-up-a-database-module-in-nest-js/

database-connections.ts

import { TypeOrmModule } from '@nestjs/typeorm';
import { Config } from '../shared/config/config';
import * as appRootPath from 'app-root-path';
import * as path from 'path';

export const databaseConnections = [
    TypeOrmModule.forRoot({
        type: 'postgres',
        host: Config.get.databases.main.host,
        port: Config.get.databases.main.port,
        username: Config.get.databases.main.username,
        password: Config.get.databases.main.password,
        database: Config.get.databases.main.database,
        name: Config.get.databases.main.name,
        entities: [
            // Add the paths to modules that use the main database here
            `${path.join(appRootPath.path, 'src', 'modules', 'shared')}/**/*.entity{.ts,.js}`
        ],
        synchronize: true
    })
];