How to Replicate Environment-Dependent Variable Replacement in Webpack for Angular Applications?

Passing Environment-Dependent Variables in Webpack

When migrating an Angular application from gulp to webpack, you may encounter how to replicate the functionality of replacing variables in HTML files depending on the NODE_ENV. This article provides several approaches for achieving this in webpack.

DefinePlugin

The DefinePlugin allows you to replace specific strings "as is" with environment variables.

new webpack.DefinePlugin({
    'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV || 'development')
}),

EnvironmentPlugin

Similar to DefinePlugin, EnvironmentPlugin internally uses it to map environment values to code.

new webpack.EnvironmentPlugin(['NODE_ENV'])

Alias

Another option is to consume configuration through an aliased module. In the consumer code:

var config = require('config');

The configuration can be defined as follows:

resolve: {
    alias: {
        config: path.join(__dirname, 'config', process.env.NODE_ENV)
    }
}

Based on the NODE_ENV (e.g., "development"), the configuration file will be loaded. The exported configuration from this file can contain environment-dependent variables.

By utilizing these approaches, you can effectively manage environment-dependent variables in your HTML files during the webpack build process, similar to how you would with gulp and gulp-preprocess.

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