This package is used in order to integrate with postcss and all of its plugins.
First, npm install within the project:
npm install @stencil/postcss --save-dev
Next, within the project's stencil.config.js file, import the plugin and add
it to the plugins config. In the example below we're using the autoprefixer postcss plugin, so you'll also have to run:
npm install autoprefixer @types/autoprefixer --save-dev
import { Config } from '@stencil/core';
import { postcss } from '@stencil/postcss';
import * as autoprefixer from 'autoprefixer';
export const config: Config = {
plugins: [
postcss({
plugins: [autoprefixer()]
})
]
};During development, this plugin will use postcss to process any plugins you may have passed along.
Postcss has an ecosystem of plugins itself (a plugin for a plugin if you will). For our example, we're using the autoprefixer plugin, and configuring its options. Note, you can pass any valid autoprefixer option.
exports.config = {
plugins: [
postcss({
plugins: [
autoprefixer({
browsers: ['last 6 versions'],
cascade: false
})
]
})
]
};The injectGlobalPaths config is an array of paths that automatically get added as @import declarations to all components. This can be useful to inject variables, mixins and functions to override defaults of external collections. Relative paths within injectGlobalPaths should be relative to the stencil.config.js file.
exports.config = {
plugins: [
postcss({
injectGlobalPaths: [
'src/globals/variables.pcss',
'src/globals/mixins.pcss'
]
})
]
};Note that each of these files are always added to each component, so in most cases they shouldn't contain CSS because it'll get duplicated in each component. Instead, injectGlobalPaths should only be used for Sass variables, mixins and functions, but not contain any CSS.
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