rollup.config.mjs

import terser from "@rollup/plugin-terser";
import json from '@rollup/plugin-json';
import pkg from "./package.json" with {type: "json"};

const
  preamble=`// ${pkg.name} v${pkg.version} Copyright ${(new Date).getFullYear()} ${pkg.author.name} ${pkg.homepage}`,
  plugins=[
    json(),
    terser({
      output: {preamble}
    })
  ]
;

export default [
  {
    input: "./src/index.js",
    external: ['node-fetch'],
    output: [
      {
        name: "JSONstat",
        file: pkg.unpkg,
        format: "iife",
        banner: 'if(typeof fetch==="undefined"){fetch=null;};',
        globals: {
          "node-fetch": "fetch"
        }
      },
      {
        file: pkg.module,
        format: "esm"
      },
      {
        file: pkg.main,
        format: "cjs"
      }
    ],
    plugins
  },
  {
    input: "./src/import.js",
    output: {
      file: pkg.browser,
      format: "esm"
    },
    plugins
  }
]