100 lines
2.3 KiB
Markdown
100 lines
2.3 KiB
Markdown
# CSS Modules: Scope Locals & Extend
|
|
|
|
[](https://travis-ci.org/css-modules/postcss-modules-scope)
|
|
|
|
Transforms:
|
|
|
|
```css
|
|
:local(.continueButton) {
|
|
color: green;
|
|
}
|
|
```
|
|
|
|
into:
|
|
|
|
```css
|
|
:export {
|
|
continueButton: __buttons_continueButton_djd347adcxz9;
|
|
}
|
|
.__buttons_continueButton_djd347adcxz9 {
|
|
color: green;
|
|
}
|
|
```
|
|
|
|
so it doesn't pollute CSS global scope and can be simply used in JS like so:
|
|
|
|
```js
|
|
import styles from './buttons.css'
|
|
elem.innerHTML = `<button class="${styles.continueButton}">Continue</button>`
|
|
```
|
|
|
|
## Composition
|
|
|
|
Since we're exporting class names, there's no reason to export only one. This can give us some really useful reuse of styles:
|
|
|
|
```css
|
|
.globalButtonStyle {
|
|
background: white;
|
|
border: 1px solid;
|
|
border-radius: 0.25rem;
|
|
}
|
|
.globalButtonStyle:hover {
|
|
box-shadow: 0 0 4px -2px;
|
|
}
|
|
:local(.continueButton) {
|
|
compose-with: globalButtonStyle;
|
|
color: green;
|
|
}
|
|
```
|
|
|
|
becomes:
|
|
|
|
```
|
|
.globalButtonStyle {
|
|
background: white;
|
|
border: 1px solid;
|
|
border-radius: 0.25rem;
|
|
}
|
|
.globalButtonStyle:hover {
|
|
box-shadow: 0 0 4px -2px;
|
|
}
|
|
:local(.continueButton) {
|
|
compose-with: globalButtonStyle;
|
|
color: green;
|
|
}
|
|
```
|
|
|
|
**Note:** you can also use `composes` as a shorthand for `compose-with`
|
|
|
|
## Local-by-default & reuse across files
|
|
|
|
You're looking for [CSS Modules](https://github.com/css-modules/css-modules). It uses this plugin as well as a few others, and it's amazing.
|
|
|
|
## Building
|
|
|
|
```
|
|
npm install
|
|
npm test
|
|
```
|
|
|
|
[](https://travis-ci.org/css-modules/postcss-modules-scope)
|
|
|
|
* Lines: [](https://coveralls.io/r/css-modules/postcss-modules-scope?branch=master)
|
|
* Statements: [](http://codecov.io/github/css-modules/postcss-modules-scope?branch=master)
|
|
|
|
## Development
|
|
|
|
- `npm autotest` will watch `src` and `test` for changes and run the tests, and transpile the ES6 to ES5 on success
|
|
|
|
## License
|
|
|
|
ISC
|
|
|
|
## With thanks
|
|
|
|
- Mark Dalgleish
|
|
- Tobias Koppers
|
|
- Guy Bedford
|
|
|
|
---
|
|
Glen Maddern, 2015.
|