ES6 Conditional Import and Export: Leveraging the Power of Conditional

Question

ES6 Conditional Import and Export: Leveraging the Power of Conditional

Looking to implement a nested if else statement for importing and exporting in ES6? In this scenario, we have 2 files - production.js and development.js which contain keys for development and production code respectively. Additionally, there is another file called keys.js that imports and exports these keys based on the requirements. All 3 files are located within the same directory.

Keep in mind that package.json specifies type as "module".

production.js

const keys = {
    GOOGLE_CLIENT_ID: process.env.GOOGLE_CLIENT_ID,
    GOOGLE_CLIENT_SECRET: process.env.GOOGLE_CLIENT_SECRET,
    mongoURI: process.env.MONGO_URI,
    cookieKey: process.env.COOKIE_KEY
}

export default keys;

development.js

const keys = {
    GOOGLE_CLIENT_ID: 'something.something',
    GOOGLE_CLIENT_SECRET: 'itisasecret',
    mongoURI: 'database',
    cookieKey: 'blabla',
}

export default keys;

keys.js

if (process.env.NODE_ENV === 'production') {
    
    /*This section throws error*/
    
    import keys from './production.js'
    export default keys
}
else{

    /*This section also throws error*/

    import keys from './development.js'
    export default keys
}

javascript npm ecmascript-6 import

Answer 1

Answer №1

Importing a module dynamically does not require writing nested if/else statements, but rather utilizing the dynamic import syntax. This is necessary because the standard import statement can only accept a single or double quoted string as the path to the module. By using import(), which resembles a function but operates differently, you can leverage a string template literal within the parentheses to bring in the required file.

The drawback of using import() is that it returns a Promise object that needs to be managed, although this process is not overly complicated.

Below is the solution:

index.js

import keys from './keys.js';
console.log(keys);

production.js

const keys = { stuff: 'production' }
export default keys;

development.js

const keys = { stuff: 'development' }
export default keys;

keys.js

process.env.NODE_ENV = 'production';
let keys;
(async ()=>{
  try {
    keys = import( `./${process.env.NODE_ENV}.js`);
  } catch(err) {
    console.log(err);
  }
})();
export default await keys;

It's important to note the async code used here to handle the Promise object. Additionally, the try/catch block should consistently encompass an await statement for proper Promise rejection handling.

By following this method, there is no need for conditional if/else logic.

For a live demonstration of this approach, you can access the provided working example link.

Answer 2

Importing a module dynamically does not require writing nested if/else statements, but rather utilizing the dynamic import syntax. This is necessary because the standard import statement can only accept a single or double quoted string as the path to the module. By using import(), which resembles a function but operates differently, you can leverage a string template literal within the parentheses to bring in the required file.

The drawback of using import() is that it returns a Promise object that needs to be managed, although this process is not overly complicated.

Below is the solution:

index.js

import keys from './keys.js';
console.log(keys);

production.js

const keys = { stuff: 'production' }
export default keys;

development.js

const keys = { stuff: 'development' }
export default keys;

keys.js

process.env.NODE_ENV = 'production';
let keys;
(async ()=>{
  try {
    keys = import( `./${process.env.NODE_ENV}.js`);
  } catch(err) {
    console.log(err);
  }
})();
export default await keys;

It's important to note the async code used here to handle the Promise object. Additionally, the try/catch block should consistently encompass an await statement for proper Promise rejection handling.

By following this method, there is no need for conditional if/else logic.

For a live demonstration of this approach, you can access the provided working example link.

Answer 3

Answer №2

It's important to note that the process is not as straightforward as you may think. What you're outlining resembles a concept known as dynamic import.

You should start by importing key sets from both files.
Create an object that links keys with corresponding NODE_ENV values.
After selecting the keys, export them.

import productionKeys from './production.js'
import developmentKeys from './development.js'

const keys = {
  'production': productionKeys,
  'development': developmentKeys
};

const selectedKeys = keys[process.env.NODE_ENV];

export default selectedKeys;

Answer 4

It's important to note that the process is not as straightforward as you may think. What you're outlining resembles a concept known as dynamic import.

You should start by importing key sets from both files.
Create an object that links keys with corresponding NODE_ENV values.
After selecting the keys, export them.

import productionKeys from './production.js'
import developmentKeys from './development.js'

const keys = {
  'production': productionKeys,
  'development': developmentKeys
};

const selectedKeys = keys[process.env.NODE_ENV];

export default selectedKeys;

ES6 Conditional Import and Export: Leveraging the Power of Conditional

Answer №1

Answer №2

Similar questions

React.js: The specified element type is not valid:

"Troubleshooting IE-specific problem: Loading dropdown options dynamically with AJAX on change

The JavaScript slideshow fails to display an image during one rotation

Generating a default template for an Angular ag-Grid cell with a custom field name - how to do it?

struggling to send JSON data to PHP using AJAX

Saving file with HTML download button results in only HTML document being saved

"Proper Installation of Angular Project Dependencies: A Step-by-Step

What is the method to retrieve the base host in AngularJS?

Retrieve the heading from a pop-up box

Multiple components are returned with switch case

Error: EsLint detected that the classname is not a valid Tailwind CSS class

Obtaining a value from an input field in Vue.js

The placement of the FirebaseAuth.onAuthStateChanged call in an Angular application is a common concern for developers

What is the best way to apply three unique classes to multiple div elements using jQuery?

Router DOM in conjunction with Next.js

Exploring VueJS Router History Mode with NGinx web server

The UseEffect function ceases to function properly upon refreshing the website

Closing a dropdown on outside click in NEXT.JS can be done by adding an event

Error encountered while attempting to load configuration "plugin:vue/no-layout-rules" for extension

Send the ID of the checkbox to a PHP file using AJAX