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Document upgrade path for --config CLI option #2041

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21 changes: 21 additions & 0 deletions src/docs/upgrade-guide.mdx
Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
import { CodeExampleStack } from "@/components/code-example";

export const title = "Upgrade guide";
export const description = "Upgrading your Tailwind CSS projects from v3 to v4.";

Expand Down Expand Up @@ -74,6 +76,25 @@ npx tailwindcss -i input.css -o output.css
npx @tailwindcss/cli -i input.css -o output.css
```

#### CLI options

In v3, you could use the `--config` option to point to your configuration file.
In v4 there is no configuration file anymore. If you still require a
configuration file, make sure to include it in your CSS file and use the `@config` directive:
Comment on lines +81 to +83
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What do you think about something like this? (probably still needs to be split across multiple lines tho)

Suggested change
In v3, you could use the `--config` option to point to your configuration file.
In v4 there is no configuration file anymore. If you still require a
configuration file, make sure to include it in your CSS file and use the `@config` directive:
In v3, you could use the `--config` option to point to your configuration file. Now that projects are configured via CSS this option is no longer available. For projects that require a configuration file for compatibility reasons, load the file by using the `@config` directive in your CSS:


<CodeExampleStack>

```css
/* [!code filename:input.css] */
@config "./tailwind.config.js";
```

```shell
npx @tailwindcss/cli -i input.css -o output.css
```
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Should you include the config file content as an example code block too?


</CodeExampleStack>

## Changes from v3

Here's a comprehensive list of all the breaking changes in Tailwind CSS v4.0.
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