rollup-plugin-merge-and-inject-css

A rollup plugin to collect and combine all the imported css file and inject them to the head at the top of style blocks list.

Install

npm install --save-dev rollup-plugin-merge-and-inject-css

yarn add rollup-plugin-merge-and-inject-css --dev

Plugin options

Name	Type	Required	Description
id	String	false	The id of your rollup build, it's needed to update build properly in watch mode. Default value is the random uid for a current watch run.

Usage

The common scenario for using this plugin is the merging of css files produced by different component. For example, it's useful for rollup-plugin-vue.

The default inject tool of this plugin will produce something like that:

  <style>
    .red-component {
      color: red;
    }
  </style> 
  <style>
    .blue-component {
      color: blue;
    }
  </style> 
  <style>
    .green-component {
      color: green;
    }
  </style> 

This plugin will produce this (if all that components are the part of a generating bundle):

  <style>
    /*for=example-components*/
    .red-component {
      color: red;
    }
    .blue-component {
      color: blue;
    }
    .green-component {
      color: green;
    }
  </style> 

Example

The example of the rollup config with this plugin

import autoprefixer from 'autoprefixer';
import Vue from 'rollup-plugin-vue';
import babel from 'rollup-plugin-babel';
import commonjs from 'rollup-plugin-commonjs';
import external from 'rollup-plugin-peer-deps-external';
import postcss from 'rollup-plugin-postcss';
import resolve from 'rollup-plugin-node-resolve';
import url from 'rollup-plugin-url';
import sass from 'rollup-plugin-sass';
import css from 'rollup-plugin-merge-and-inject-css'
 
import pkg from './package.json';
 
export default {
  input: 'src/index.js',
  output: [
    {
      file: pkg.main,
      format: 'cjs',
      sourcemap: true
    },
    {
      file: pkg.module,
      format: 'es',
      sourcemap: true
    }
  ],
  plugins: [
    external(),
    css({
      id: 'example-components'
    }),
    Vue({
      css: false,
      style: {
        postcssPlugins: [autoprefixer]
      }
    }),
    url(),
    babel({
      exclude: 'node_modules/**',
    }),
    resolve(),
    commonjs(),
  ]
}