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Aug 19, 2021
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docs: improve migration guide #3683

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6 changes: 6 additions & 0 deletions migration-v4.md
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This document serves as a migration guide for `[email protected]`.

### Before updating

- `webpack-dev-server` v3 and `webpack-dev-server` v4 automatically apply `HotModuleReplacementPlugin` plugin when you set `hot: true`, so please check you don't have `HotModuleReplacementPlugin` in your `plugins` if you have `hot: true`/`hot: "only"`
- `webpack-dev-server` v3 and `webpack-dev-server` v4 automatically inject `webpack/hot/dev-server` in your `entry` option when you set `hot: true` (except when you use `injectHot` for webpack-dev-server v3), please check you don't have `webpack/hot/dev-server` in your `entry` option
- `webpack-dev-server` v3 and `webpack-dev-server` v4 automatically inject `webpack-dev-server/client/index.js` in your `entry` option (except when you use `injectClient` for webpack-dev-server v3), please check you don't have `webpack-dev-server/client/index.js` in your `entry` option

### ⚠ BREAKING CHANGES

- Minimum supported `Node.js` version is `12.13.0`.
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