feat: Convert ts files to js files for config folder

packages/backend/src/config/database.js

@@ -0,0 +1,22 @@
+import process from 'process';
+// The following two lines are required to get count values as number.
+// More info: https://github.com/knex/knex/issues/387#issuecomment-51554522
+import pg from 'pg';
+pg.types.setTypeParser(20, 'text', parseInt);
+import knex from 'knex';
+import knexConfig from '../../knexfile';
+import logger from '../helpers/logger';
+
+export const client = knex(knexConfig);
+
+const CONNECTION_REFUSED = 'ECONNREFUSED';
+
+client.raw('SELECT 1').catch((err) => {
+  if (err.code === CONNECTION_REFUSED) {
+    logger.error(
+      'Make sure you have installed PostgreSQL and it is running.',
+      err
+    );
+    process.exit();
+  }
+});