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Adds v3 to v4 migration guide #1941

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Adds v3 to v4 migration guide #1941

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27 changes: 27 additions & 0 deletions src/content/guides/migrating-3-to-4.md
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---
title: Migrating Versions
sort: 15
contributors:
- sokra
- jhnns
- grgur
- domfarolino
- johnnyreilly
- jouni-kantola
- frederikprijck
- chrisVillanueva
- bebraw
- howdy39
- selbekk
- ndelangen
---

The following sections describe the major changes from webpack 3 to 4.

T> If you are running into issues, please see [the changelog](https://github.com/webpack/webpack/releases) for details.

W> Are you looking to migrating from v1 to v2? Here is the blog post detailing how to do it.

## `NoEmitOnErrorsPlugin`

This plugin has been replaced with `optimization.noEmitErrors`. This is on by default in `production` `mode`. Not sure what `mode` is? Check out [here](https://webpack.js.org/concepts/mode/).