rollup.config.js

import peerDepsExternal from "rollup-plugin-peer-deps-external";
import resolve from "@rollup/plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";
import typescript from "rollup-plugin-typescript2";
import postcss from "rollup-plugin-postcss";

const packageJson = require("./package.json");

export default {
  onwarn: function (warning, warn) {
    if (warning.code === 'CIRCULAR_DEPENDENCY') return;
    warn(warning);
  },
  input: "src/index.ts",
  output: [
    {
      file: packageJson.main,
      format: "cjs",
      sourcemap: true
    },
    {
      file: packageJson.module,
      format: "esm",
      sourcemap: true
    }
  ],
  plugins: [
    peerDepsExternal(),
    resolve(),
    commonjs(),
    postcss({
      config: {
          path: "./postcss.config.js",
      },
      extensions: [".css"],
      minimize: false,
      inject: {
        insertAt: "top",
      }
    }),
    typescript({ useTsconfigDeclarationDir: true }),
  ]
};