Tree-shaking is not happening

[krazyjakee]

The webpack plugin "ModuleConcatenationPlugin" doesn't seem to run in production mode.

Any import { x } from 'x' adds the entire module x to the production bundle.

What could be causing this?

Here is a minimal example of this issue in action: https://github.com/krazyjakee/Razzle-Sandbox/blob/tree-shaking/src/App.js#L2

You can see the entire date-fns package is imported to the bundle when running npm run build.

[krazyjakee]

Updated with an example repo

[krazyjakee]

@jaredpalmer confirmed this is planned for V4 and is not a bug, just not implemented.

https://spectrum.chat/notifications?thread=68062cb8-a254-43c2-9330-69e537a9753d

[stale]

Hola! So here's the deal, between open source and my day job and life and what not, I have a lot to manage, so I use a GitHub bot to automate a few things here and there. This particular GitHub bot is going to mark this as stale because it has not had recent activity for a while. It will be closed if no further activity occurs in a few days. Do not take this personally--seriously--this is a completely automated action. If this is a mistake, just make a comment, DM me, send a carrier pidgeon, or a smoke signal.

[krazyjakee]

This is fixed in v4

[mrmartineau]

@krazyjakee don't you mean v3?

[krazyjakee]

@mrmartineau sorry getting ahead of myself