How to pass .env file variables to webpack config?

Question

I am new to webpack and worked out almost all build sections, but now the problem is that I want to pass the environment variables from a .env file to webpack config, so tha

Answer 1

It doesn't match your case exactly (although partially), but I've found this formula to be working best for me.

I use a combination of 2 libs: dotenv to read the .env file for the webpack.config.js (configuration) needs, and webpack-dotenv-plugin for the validation (based on .env.example file) and to pass all the vars from .env file to the application code:

Part of my webpack.config.js:

// this is to load env vars for this config
require('dotenv').config({ // it puts the content to the "process.env" var. System vars are taking precedence
    path: '.env.webpack',
});
// and this to pass env vars to the JS application
const DotenvPlugin = require('webpack-dotenv-plugin');

plugins section:

plugins: [
    // ...
    new DotenvPlugin({ // makes vars available to the application js code
        path: '.env.webpack',
        sample: '.env.webpack.example',
        allowEmptyValues: true,
    }),
    // ...
]