rollup.config.js for https://stackoverflow.com/questions/62117700/

rollup.config.js

import resolve from '@rollup/plugin-node-resolve';
import replace from '@rollup/plugin-replace';
import commonjs from '@rollup/plugin-commonjs';
import svelte from 'rollup-plugin-svelte';
import babel from '@rollup/plugin-babel';
import { terser } from 'rollup-plugin-terser';
import config from 'sapper/config/rollup.js';
import pkg from './package.json';

import json from '@rollup/plugin-json';
import globals from 'rollup-plugin-node-globals';
import builtins from 'rollup-plugin-node-builtins';

const mode = process.env.NODE_ENV;
const dev = mode === 'development';
const legacy = !!process.env.SAPPER_LEGACY_BUILD;

const onwarn = (warning, onwarn) => (warning.code === 'CIRCULAR_DEPENDENCY' && /[/\\]@sapper[/\\]/.test(warning.message)) || onwarn(warning);

export default {
  client: {
    input: config.client.input(),
    output: config.client.output(),
    external: ['readable-stream', 'readable-stream/transform'],
    plugins: [
      replace({
        'process.browser': true,
        'process.env.NODE_ENV': JSON.stringify(mode),
        'require(\'readable-stream/transform\')': 'require(\'stream\').Transform',
        'require("readable-stream/transform")': 'require("stream").Transform',
        'readable-stream': 'stream',
      }),
      svelte({
        dev,
        hydratable: true,
        emitCss: true
      }),
      resolve({
        browser: true,
        dedupe: ['svelte'],
        preferBuiltins: true,
      }),
      commonjs(),
      json(),
      globals(),
      builtins(),

      legacy && babel({
        extensions: ['.js', '.mjs', '.html', '.svelte'],
        babelHelpers: 'runtime',
        exclude: ['node_modules/@babel/**'],
        presets: [
          ['@babel/preset-env', {
            targets: '> 0.25%, not dead'
          }]
        ],
        plugins: [
          '@babel/plugin-syntax-dynamic-import',
          ['@babel/plugin-transform-runtime', {
            useESModules: true
          }]
        ]
      }),

      !dev && terser({
        module: true
      })
    ],

    preserveEntrySignatures: false,
    onwarn,
  },

  server: {
    input: config.server.input(),
    output: config.server.output(),
    plugins: [
      replace({
        'process.browser': false,
        'process.env.NODE_ENV': JSON.stringify(mode)
      }),
      svelte({
        generate: 'ssr',
        dev
      }),
      resolve({
        dedupe: ['svelte']
      }),
      commonjs()
    ],
    external: Object.keys(pkg.dependencies).concat(
      require('module').builtinModules || Object.keys(process.binding('natives'))
    ),

    preserveEntrySignatures: 'strict',
    onwarn,
  },

  serviceworker: {
    input: config.serviceworker.input(),
    output: config.serviceworker.output(),
    plugins: [
      resolve(),
      replace({
        'process.browser': true,
        'process.env.NODE_ENV': JSON.stringify(mode)
      }),
      commonjs(),
      !dev && terser()
    ],

    preserveEntrySignatures: false,
    onwarn,
  }
};

rollup.config.js.patch

diff --git a/rollup.config.js b/rollup.config.js
index a1d449e..55958aa 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -7,6 +7,10 @@ import { terser } from 'rollup-plugin-terser';
 import config from 'sapper/config/rollup.js';
 import pkg from './package.json';
 
+import json from '@rollup/plugin-json';
+import globals from 'rollup-plugin-node-globals';
+import builtins from 'rollup-plugin-node-builtins';
+
 const mode = process.env.NODE_ENV;
 const dev = mode === 'development';
 const legacy = !!process.env.SAPPER_LEGACY_BUILD;
@@ -17,10 +21,14 @@ export default {
 	client: {
 		input: config.client.input(),
 		output: config.client.output(),
+	  external: ['readable-stream', 'readable-stream/transform'],
 		plugins: [
 			replace({
 				'process.browser': true,
-				'process.env.NODE_ENV': JSON.stringify(mode)
+				'process.env.NODE_ENV': JSON.stringify(mode),
+				'require(\'readable-stream/transform\')': 'require(\'stream\').Transform',
+				'require("readable-stream/transform")': 'require("stream").Transform',
+				'readable-stream': 'stream',
 			}),
 			svelte({
 				dev,
@@ -29,9 +37,13 @@ export default {
 			}),
 			resolve({
 				browser: true,
-				dedupe: ['svelte']
+				dedupe: ['svelte'],
+				preferBuiltins: true,
 			}),
 			commonjs(),
+			json(),
+			globals(),
+			builtins(),
 
 			legacy && babel({
 				extensions: ['.js', '.mjs', '.html', '.svelte'],