How to detect if webpack-dev-server is running?

Question

How can I determine if webpack.config.js was loaded via webpack vs webpack-dev-server?

Answer 1

The webpack dev server will now set the WEBPACK_DEV_SERVER environment variable, allowing for a more robust way to check.

const isDevServer = process.env.WEBPACK_DEV_SERVER; 

Answer 2

Either:

const isDevServer = process.argv[1].indexOf('webpack-dev-server') !== -1;

or:

const isDevServer = process.argv.some(v => v.indexOf('webpack-dev-server') !== -1);

or:

const isDevServer = process.argv.some(v => v.includes('webpack-dev-server'));

I've been using the latter to a great effect. One configuration FTW!

Answer 3

I found one potential soluton:

var isDevServer = path.basename(require.main.filename) === 'webpack-dev-server.js';

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