text: import svelte from "rollup-plugin-svelte";
  import resolve from "@rollup/plugin-node-resolve";
  import commonjs from "@rollup/plugin-commonjs";
  import livereload from "rollup-plugin-livereload";
  import { terser } from "rollup-plugin-terser";
  
  import alias from "@rollup/plugin-alias";
  import json from "@rollup/plugin-json";
  import postcss from "rollup-plugin-postcss";
  import autoPreprocess from "svelte-preprocess";
  import buble from "rollup-plugin-buble";
  import sizes from "rollup-plugin-sizes";
  
  const production = !process.env.ROLLUP_WATCH;
  
  export default {
    input: "/src/main.js",
    output: {
      sourcemap: true,
      format: "iife",
      name: "app",
      file: "public/build/bundle.js"
    },
    plugins: [
      svelte({
        // enable run-time checks when not in production
        dev: !production,
        // we'll extract any component CSS out into
        // a separate file - better for performance
        css: (css) => {
          css.write("public/build/bundle.css");
        },
        preprocess: autoPreprocess({
          scss: {
            includePaths: ["node_modules", "src"]
          }
        })
      }),
  
      // If you have external dependencies installed from
      // npm, you'll most likely need these plugins. In
      // some cases you'll need additional configuration -
      // consult the documentation for details:
      // https://github.com/rollup/plugins/tree/master/packages/commonjs
      resolve({
        browser: true,
        dedupe: ["svelte"]
      }),
      commonjs(),
  
      // In dev mode, call `npm run start` once
      // the bundle has been generated
      !production && serve(),
  
      // Watch the `public` directory and refresh the
      // browser on changes when not in production
      !production && livereload("public"),
  
      // If we're building for production (npm run build
      // instead of npm run dev), minify
      production && terser(),
  
      alias({
        resolve: [".js", ".json", ".scss", ".svelte"],
        entries: [{ find: /^\/src/, replacement: __dirname + "/src" }]
      }),
      json(),
      postcss(),
  
      buble({
        objectAssign: "Object.assign",
        transforms: {
          asyncAwait: false,
          forOf: false
        }
      }),
      sizes()
    ],
  
    watch: {
      clearScreen: false
    },
  
    //see https://github.com/d3/d3-selection/issues/168
    onwarn: function (warning, warn) {
      if (warning.code === "CIRCULAR_DEPENDENCY") return;
      if (warning.code === "EVAL") return;
      warn(warning);
    }
  };
  
  function serve() {
    let started = false;
  
    return {
      writeBundle() {
        if (!started) {
          started = true;
  
          require("child_process").spawn("npm", ["run", "start", "--", "--dev"], {
            stdio: ["ignore", "inherit", "inherit"],
            shell: true
          });
        }
      }
    };
  }
  