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Add support for CSS modules #295

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merged 3 commits into from
Jul 6, 2016
Merged

Add support for CSS modules #295

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d6e5388
Add support for CSS modules
jakubrohleder May 23, 2016
34f197e
Minor fixes
jakubrohleder Jun 9, 2016
5b101be
Merge branch 'master' into feature/css-modules
jakubrohleder Jun 11, 2016
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10 changes: 10 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -391,7 +391,17 @@ if (process.env.NODE_ENV === 'production') {
// Then in your <head>
{css}
```
### CSS modules

[CSS modules](https://github.com/css-modules/css-modules) are support by default for all files with `.module.(css|less|scss|sass)` extension.

```javascript
// Uses CSS Modules
import './my-component.module.css'

// Doesn't use CSS Modules
import './main.css'
```

### Configuring Babel

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59 changes: 59 additions & 0 deletions lib/utils/webpack.config.js
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Expand Up @@ -122,6 +122,7 @@ module.exports = (program, directory, suppliedStage, webpackPort = 1500, routes
},
__PREFIX_LINKS__: program.prefixLinks,
}),
new ExtractTextPlugin('styles.css'),
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We don't extract styles here and in build-javascript on purpose as we already do that in the build-css stage. Doing it again would be wasted effort.

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@jakubrohleder jakubrohleder May 24, 2016 •
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Without this line the following snippet:

import styles from './style.css'

is producing an empty object. I don't fully understand the reason of it.

Maybe there is a better alternative for this?

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Oh hmmm... when building the HTML pages you mean? That does make sense.

Probably what you need to do is just copy the modules css loader config from develop to build-html as right now in build-html all css loaders are turned off. https://github.com/jakubrohleder/gatsby/blob/d6e5388ea0b5581e4422afd02110808716d13e02/lib/utils/webpack.config.js#L357-L373

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I did some testing: for build-html step css-modules loaders has to be turned on (or just not turned off), they use ExtractTextPlugin so it also has to be included in the build step configuration. On the other hand they are not needed in build-javascript step. I don't know why previously it seemed to me that this is necessary.

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Seems reasonable. And since this is a new experimental change that doesn't conflict with anything (unless someone named their css file *.modules.css) we can ship something we're not 100% on and refine it after the fact.

]
case 'build-javascript':
return [
Expand Down Expand Up @@ -269,20 +270,43 @@ module.exports = (program, directory, suppliedStage, webpackPort = 1500, routes
loader: 'file-loader',
})

const cssModulesConf = 'css?modules&importLoaders=1'
const cssModulesConfDev =
`${cssModulesConf}&sourceMap&localIdentName=[name]---[local]---[hash:base64:5]`
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localIdentName is just for the generated class names correct?

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Exactly, by default class names are rewritten to hashes, but for development it is more convenient to have extra [name]---[local] prefix, so you can easily identify module where class comes from.

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👍


switch (stage) {
case 'develop':

config.loader('css', {
test: /\.css$/,
exclude: /\.module\.css$/,
loaders: ['style', 'css', 'postcss'],
})
config.loader('less', {
test: /\.less/,
exclude: /\.module\.less$/,
loaders: ['style', 'css', 'less'],
})
config.loader('sass', {
test: /\.(sass|scss)/,
exclude: /\.module\.(sass|scss)$/,
loaders: ['style', 'css', 'sass'],
})

// CSS modules
config.loader('cssModules', {
test: /\.module\.css$/,
loaders: ['style', cssModulesConfDev, 'postcss'],
})
config.loader('lessModules', {
test: /\.module\.less/,
loaders: ['style', cssModulesConfDev, 'less'],
})
config.loader('sassModules', {
test: /\.module\.(sass|scss)/,
loaders: ['style', cssModulesConfDev, 'sass'],
})

config.merge({
postcss: [
require('postcss-import')(),
Expand All @@ -296,16 +320,33 @@ module.exports = (program, directory, suppliedStage, webpackPort = 1500, routes
case 'build-css':
config.loader('css', {
test: /\.css$/,
exclude: /\.module\.css$/,
loader: ExtractTextPlugin.extract(['css', 'postcss']),
})
config.loader('less', {
test: /\.less/,
exclude: /\.module\.less$/,
loader: ExtractTextPlugin.extract(['css', 'less']),
})
config.loader('sass', {
test: /\.(sass|scss)/,
exclude: /\.module\.(sass|scss)$/,
loader: ExtractTextPlugin.extract(['css', 'sass']),
})

// CSS modules
config.loader('cssModules', {
test: /\.module\.css$/,
loader: ExtractTextPlugin.extract('style', [cssModulesConf, 'postcss']),
})
config.loader('lessModules', {
test: /\.module\.less/,
loader: ExtractTextPlugin.extract('style', [cssModulesConf, 'less']),
})
config.loader('sassModules', {
test: /\.module\.(sass|scss)/,
loader: ExtractTextPlugin.extract('style', [cssModulesConf, 'sass']),
})
config.merge({
postcss: [
require('postcss-import')(),
Expand All @@ -322,19 +363,37 @@ module.exports = (program, directory, suppliedStage, webpackPort = 1500, routes
case 'build-html':
// We don't deal with CSS at all when building the HTML.
// The 'null' loader is used to prevent 'module not found' errors.
// On the other hand CSS modules loaders are necessary

config.loader('css', {
test: /\.css$/,
exclude: /\.module\.css$/,
loader: 'null',
})
config.loader('less', {
test: /\.less/,
exclude: /\.module\.less$/,
loader: 'null',
})
config.loader('sass', {
test: /\.(sass|scss)/,
exclude: /\.module\.(sass|scss)$/,
loader: 'null',
})

// CSS modules
config.loader('cssModules', {
test: /\.module\.css$/,
loader: ExtractTextPlugin.extract('style', [cssModulesConf, 'postcss']),
})
config.loader('lessModules', {
test: /\.module\.less/,
loader: ExtractTextPlugin.extract('style', [cssModulesConf, 'less']),
})
config.loader('sassModules', {
test: /\.module\.(sass|scss)/,
loader: ExtractTextPlugin.extract('style', [cssModulesConf, 'sass']),
})
return config

case 'build-javascript':
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