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