rollup.config.js

import peerDepsExternal from "rollup-plugin-peer-deps-external"
import typescript from "rollup-plugin-typescript2"
import postcss from "rollup-plugin-postcss"
import packageJson from "./package.json"
import { terser } from "rollup-plugin-terser"
import progress from "rollup-plugin-progress"
import { visualizer } from "rollup-plugin-visualizer"
import svgr from "@svgr/rollup"
import autoprefixer from "autoprefixer"
import copy from "rollup-plugin-copy"
import url from "@rollup/plugin-url"
import sass from "rollup-plugin-sass"

//https://www.codefeetime.com/post/rollup-config-for-react-component-library-with-typescript-scss/
//https://github.com/egoist/rollup-plugin-postcss/issues/385

// eslint-disable-next-line import/no-anonymous-default-export
export default [
    {
        input: ["src/index.ts", "src/gallery/index.ts", "src/inputs/index.ts", "src/cards/index.ts", "src/buttons/index.ts", "src/dialogs/index.ts", "src/popovers/index.ts"],
        output: [
            {
                dir: "dist",
                format: "cjs",
                exports: "auto",
                sourcemap: false
            }
        ],
        preserveModules: true,
        plugins: [
            progress(),
            copy({
                targets: [{ src: "src/assets/img/*", dest: "dist/assets/img" }]
            }),
            url(),
            svgr(),
            peerDepsExternal(),
            typescript({ useTsconfigDeclarationDir: true }),
            // -- Works ---
            postcss({
                extract: true,
                minimize: true,
                modules: true,
                plugins: [autoprefixer()]
            }),
            // sass({
            //   options:{
            //     data: `@import "src/style/variables.scss";`,
            //     processor: css => postcss({plugins:[autoprefixer], modules:true, inject:true}).process(css).then(result => result.css)
            //   }
            // }),
            terser(),
            visualizer({})
        ],
        external: [...Object.keys(packageJson.peerDependencies || {}), ...Object.keys(packageJson.dependencies || {})]
    }
]