1. Install sass dependencies
npm install sass-loader --save-dev
npm install node-sass --sava-dev
npm install vue-style-loader --sava-dev
vue-loader is a webpack loader. Used to convert vue components into deployable js, html, css modules. So if we want to use scss in the vue project, we must tell vue-loader how to parse my scss file.
In webpack, all preprocessors must match the corresponding loaders. Does vue-loader allow other webpack-loaders to process part of the component, and then it automatically determines the loaders to be used based on the lang attribute. So, just install the loader that handles sass/scss. You can use scss in vue.
No need to configure loader for scss/sass, because vue-loader will automatically use the corresponding loader according to the file format suffix name
2. Why no need to configure
As we mentioned earlier, vue-loader allows automatic determination of loaders to be used based on the lang attribute. How does it do it? Is it so amazing? Let’s take a look at the source code of the core part
exports.cssLoaders = function (options) {
options = options || {
}
var cssLoader = {
loader: 'css-loader',
options: {
minimize: process.env.NODE_ENV === 'production',
sourceMap: options.sourceMap
}
}
// generate loader string to be used with extract text plugin
function generateLoaders (loader, loaderOptions) {
var loaders = [cssLoader]
if (loader) {
loaders.push({
loader: loader + '-loader',
options: Object.assign({
}, loaderOptions, {
sourceMap: options.sourceMap
})
})
}
// Extract CSS when that option is specified
// (which is the case during production build)
if (options.extract) {
return ExtractTextPlugin.extract({
use: loaders,
fallback: 'vue-style-loader'
})
} else {
return ['vue-style-loader'].concat(loaders)
}
}
// https://vue-loader.vuejs.org/en/configurations/extract-css.html
return {
css: generateLoaders(),
postcss: generateLoaders(),
less: generateLoaders('less'),
sass: generateLoaders('sass', {
indentedSyntax: true }),
scss: generateLoaders('sass'),
stylus: generateLoaders('stylus'),
styl: generateLoaders('stylus')
}
}
It is the above code that gives vue-loader this ability. It will use different loaders according to different files.