Re-enable Source maps in production, reverts #770

[guilleiguaran]

per #769 (comment)

[javan]

🖥🔭

[connorshea]

This should have a changelog entry (and possibly should be mentioned in the v4 upgrade doc as well).

Make sure to mention that it makes debugging in production easier, will be compressed by default, and shouldn’t increase the asset size by very much, as source maps aren’t loaded unless the dev tools are opened. :)

[wildjcrt]

@gauravtiwari hi, is there any way to change devtool for source map?

[gauravtiwari]

@wildjcrt Sure, please see: https://github.com/rails/webpacker/blob/master/docs/webpack.md#configuration

// development.js or production.js

const environment = require('./environment')
environment.config.merge({ devtool: 'none' })

module.exports = environment.toWebpackConfig()