What is the process for transferring an environment.json file to the output directory and then utilizing it with Webpack 4?

Our application is expanding with multiple environments and vendors on the horizon. While the traditional approach of running

webpack --env.NODE_ENV=myenvironment
works for now, it will soon become inefficient.

The main objective here is to streamline the process by simply copying the environment.json file into the output folder. This way, I can handle transformations in Octopus Deploy without the need for multiple builds.

Essentially, I want to use a single environment.json file for variable substitutions in Octopus Deploy. Here's a peek at what that might look like:

{
    "production": false,
    "baseUrl": "http://myapp.com",
    "appId": "MyAppId"
}

In my AngularJS code, I'm setting up constants based on these values:

import * as environment from '../../environment.json';
console.log(environment.baseUrl); // http://myapp.com

angular.module('app')
  .constant('environment', environment);

Seems straightforward so far.

The issue arises when I make changes within the dist/environment.json file (located in the output folder) and those updates don't get reflected. For instance, if I update the value of baseUrl to http://myapp-dev.com, the console still shows http://myapp.com.

Here's a snippet of code from my webpack.config.js:

Rules

...
{
  test: /\.json$/,
  use: 'json-loader',
  exclude: [/environment\.json$/]
},
... 

Plugins

...
new CopyWebpackPlugin([{
  from: 'environment.json'
},
...

While this code successfully copies the environment.json file to the output folder, the other files there seem unaffected. It seems like they are still tied to webpack somehow.

Answer №1

CopyWebpackPlugin simply copies a file without any further actions taking place, and Webpack does not utilize it internally. The static JSON import is likely included in your main bundle js.

Instead of attempting to dynamically interchange certain parts of the build, consider defining an external module. This approach grants you the flexibility to provide any desired globals to the browser environment, and webpack will be able to locate them at runtime.

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