How do I export an object in TypeScript?

Question

For example, I'm trying to export a TS object to get this JavaScript output:

const path = require('path'),       rootPath = path.normalize(__dirname + '/..'),       env = process.env.NODE_ENV || 'development';  let config = {   development: {     amqpUrl: "amqp://localhost:15672",     root: rootPath        },   test: {     amqpUrl: "amqp://localhost:5672",     root: rootPath      },   production: {     amqpUrl: "amqp://localhost:5672",     root: rootPath    } }; module.exports = config[env]; 

This is my TS, but it's not clear with exporting,

import path = require("path")          const rootPath = path.normalize(__dirname + '/..')     const env = process.env.NODE_ENV || 'development'          let config = {       development: {         amqpUrl: "amqp://localhost:15672",         root: rootPath                },       test: {         amqpUrl: "amqp://localhost:5672",         root: rootPath              },       production: {         amqpUrl: "amqp://localhost:5672",         root: rootPath            }     };     /* this is the line i'm having problem how can i export config object*/     // export config[env]; 

I've tried export default config[env] but its generated output isn't expected. What am I doing wrong?

Answer 1

In ES6 you are allowed to export names using the export function, or for default you can export anything. The require format goes like this:

let config = require('config') 

And it takes the default export of config file. In your case, you should do:

export default config[env] 

If you want to use the export, you would do something like:

let Environment = config[env]; export {Environment} 

The difference would be:

import EnvirmentNameWhatever from "./config" 

to

import {Environment} from "./config" 

• Note - when default exporting, you can use whatever name you like, while when just exporting, you have to use the exported name.

Answer 2

Using the export keyword on the declarations to export should do the job, like this:

import path = require("path")  const rootPath = path.normalize(__dirname + '/..') export const env = process.env.NODE_ENV || 'development'  export let config = {     development: {     amqpUrl: "amqp://localhost:15672",     root: rootPath      },     test: {     amqpUrl: "amqp://localhost:5672",     root: rootPath      },     production: {     amqpUrl: "amqp://localhost:5672",     root: rootPath      } };