more info on environment support

[jchip]

I am trying to find out more info about these two features:

• Supports environment variables under #extend(), #merge(), #defaults() methods
• Supports process.env.* variables in addition to environment ones

I see that in the readme there's

// Also you may use `'conf/webpack.[NODE_ENV].config.js'`

Is there more info somewhere else?

[mdreizin]

@jchip Fot instance, if you have the following npm script:

"scripts": {
    "start": "NODE_ENV=development webpack-dev-server --config webpack.config.js --progress --port 3000 --https --hot --inline --compress",
    "build": "NODE_ENV=production webpack --config webpack.config.js --hide-modules"
  },

and the following webpack config:

webpack.config.js

const WebpackConfig = require('webpack-config');

module.exports = new WebpackConfig().extend('./webpack.[NODE_ENV].config.js');

If you run npm run start then webpack.development.config.js will be included into webpack.config.js.

If you run npm run build then webpack.production.config.js will be included into webpack.config.js.

Also you may use environment map of webpack-config to do the same:

const WebpackConfig = require('webpack-config');
const environment = require('webpack-config'). environment;

environment.setAll({
  'env': process.env. NODE_ENV
});

module.exports = new WebpackConfig().extend('./webpack.[env].config.js');

In both cases [NODE_ENV] and [env] will be automatically interpolated.

Also if you have any strings which contain [NODE_ENV] or [env] then they also should be interpolated:

const WebpackConfig = require('webpack-config');
const environment = require('webpack-config'). environment;

environment.setAll({
  env: 'bar'
});

const webpackConfig = new WebpackConfig();

webpackConfig.merge({
  foo: 'env'
});

console.log(webpackConfig.toObject()); // => { foo: 'bar' }

Variable aka environment interpolations is designed for extend method, but you may use it for defaults and merge.

For more info please see:

https://github.com/Fitbit/webpack-config/blob/master/test/ConfigStringResolver.spec.js https://github.com/Fitbit/webpack-config/blob/master/test/ConfigEnvironment.spec.js

[jchip]

Thank you for such a thorough answer!

[mdreizin]

@jchip May I close this issue?

[mdreizin]

@jchip Do you have any additional questions?