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Commit bf31f6a

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docs: troubleshooting tips on Cannot read properties
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‎src/content/migrate/5.mdx

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@@ -13,6 +13,7 @@ contributors:
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- getsnoopy
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- yevhen-logosha
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- akash-kumar-dev
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- EvanSanderson
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---
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This guide aims to help you migrating to webpack 5 when using webpack directly. If you are using a higher level tool to run webpack, please refer to the tool for migration instructions.
@@ -292,6 +293,10 @@ Repeat the following steps until you solved at least level 3 or 4:
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- 404 errors pointing to URLs containing `auto`
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- Not all ecosystem tooling is ready for the new default automatic `publicPath` via `output.publicPath: "auto"`
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- Use a static `output.publicPath: ""` instead.
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- Cannot read properties of undefined (reading 'call')
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- If you see this error during runtime, it may be related to the [ModuleConcatenationPlugin](https://webpack.js.org/plugins/module-concatenation-plugin/). Check if you are using the plugin, and if you've included it in the `plugins` sections of a config, and that config is also set to `production` mode, remove the plugin (ie `new webpack.optimize.ModuleConcatenationPlugin()`) from your plugins list. In webpack 5, the plugin is enabled by default in production mode, and it may get included twice.
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- In general, disabling each plugin and testing the build is a good way to triage where the issue might be coming from.
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- See: [this issue](https://github.com/webpack/webpack/discussions/15369#discussioncomment-13420496) for more details.
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- Level 6: **Deprecation Warnings**.
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