Robin Malfait b497e1eaf3
Add Upgrading from Tailwind CSS v… when running upgrade tool (#19026)
This PR adds a bit more information when running the upgrade tool to
know what version of Tailwind CSS you're upgrading from. This will help
users and maintainers when things go wrong.

Will have another PR up soon that errors when the Tailwind CSS version
in package.json and node_modules don't match.

### Test plan

Ran this one one of our older projects and saw the version logged
correctly.

<img width="1055" height="363" alt="image"
src="https://github.com/user-attachments/assets/5cbf4c52-ea0f-42c8-bd55-5bae2ed511de"
/>
2025-09-29 15:59:54 +02:00

127 lines
3.9 KiB
Markdown

<p align="center">
<a href="https://tailwindcss.com" target="_blank">
<picture>
<source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-dark.svg">
<source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-light.svg">
<img alt="Tailwind CSS" src="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-light.svg" width="350" height="70" style="max-width: 100%;">
</picture>
</a>
</p>
<p align="center">
A utility-first CSS framework for rapidly building custom user interfaces.
</p>
<p align="center">
<a href="https://github.com/tailwindlabs/tailwindcss/actions"><img src="https://img.shields.io/github/actions/workflow/status/tailwindlabs/tailwindcss/ci.yml?branch=next" alt="Build Status"></a>
<a href="https://www.npmjs.com/package/tailwindcss"><img src="https://img.shields.io/npm/dt/tailwindcss.svg" alt="Total Downloads"></a>
<a href="https://github.com/tailwindcss/tailwindcss/releases"><img src="https://img.shields.io/npm/v/tailwindcss.svg" alt="Latest Release"></a>
<a href="https://github.com/tailwindcss/tailwindcss/blob/master/LICENSE"><img src="https://img.shields.io/npm/l/tailwindcss.svg" alt="License"></a>
</p>
---
## Documentation
For full documentation, visit [tailwindcss.com](https://tailwindcss.com).
## Community
For help, discussion about best practices, or feature ideas:
[Discuss Tailwind CSS on GitHub](https://github.com/tailwindcss/tailwindcss/discussions)
## Contributing
If you're interested in contributing to Tailwind CSS, please read our [contributing docs](https://github.com/tailwindcss/tailwindcss/blob/next/.github/CONTRIBUTING.md) **before submitting a pull request**.
---
## `@tailwindcss/postcss` plugin API
### Changing where the plugin searches for source files
You can use the `base` option (defaults to the current working directory) to change the directory in which the plugin searches for source files:
```js
import tailwindcss from "@tailwindcss/postcss"
export default {
plugins: [
tailwindcss({
base: path.resolve(__dirname, "./path)
})
]
}
```
### Enabling or disabling Lightning CSS
By default, this plugin detects whether or not the CSS is being built for production by checking the `NODE_ENV` environment variable. When building for production Lightning CSS will be enabled otherwise it is disabled.
If you want to always enable or disable Lightning CSS the `optimize` option may be used:
```js
import tailwindcss from '@tailwindcss/postcss'
export default {
plugins: [
tailwindcss({
// Enable or disable Lightning CSS
optimize: false,
}),
],
}
```
It's also possible to keep Lightning CSS enabled but disable minification:
```js
import tailwindcss from '@tailwindcss/postcss'
export default {
plugins: [
tailwindcss({
optimize: { minify: false },
}),
],
}
```
### Enabling or disabling `url(…)` rewriting
Our PostCSS plugin can rewrite `url(…)`s for you since it also handles `@import` (no `postcss-import` is needed). This feature is enabled by default.
In some situations the bundler or framework you're using may provide this feature itself. In this case you can set `transformAssetUrls` to `false` to disable this feature:
```js
import tailwindcss from '@tailwindcss/postcss'
export default {
plugins: [
tailwindcss({
// Disable `url(…)` rewriting
transformAssetUrls: false,
// Enable `url(…)` rewriting (the default)
transformAssetUrls: true,
}),
],
}
```
You may also pass options to `optimize` to enable Lighting CSS but prevent minification:
```js
import tailwindcss from '@tailwindcss/postcss'
export default {
plugins: [
tailwindcss({
// Enables Lightning CSS but disables minification
optimize: { minify: false },
}),
],
}
```