transcend-io · bencmbrook · Aug 11, 2025 · Aug 3, 2025 · Aug 4, 2025 · Aug 4, 2025
diff --git a/README.md b/README.md
@@ -9,14 +9,11 @@
   - [Examples](#examples)
   - [Usage](#usage)
     - [Importing Conflux](#importing-conflux)
-      - [Package Manager](#package-manager)
-      - [CDN](#cdn)
     - [Creating a ZIP](#creating-a-zip)
       - [Example using `ReadableStream#pipeThrough`](#example-using-readablestreampipethrough)
       - [Example using `writer.write`](#example-using-writerwrite)
       - [Incorporating other streams](#incorporating-other-streams)
     - [Reading ZIP files](#reading-zip-files)
-  - [Supporting Firefox](#supporting-firefox)
   - [License](#license)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
@@ -64,13 +61,7 @@
 
 ### Importing Conflux
 
-#### Package Manager
-
 ```sh
-# With Yarn
-yarn add @transcend-io/conflux
-
-# With NPM
 npm install --save @transcend-io/conflux
 ```
 
@@ -79,17 +70,6 @@ npm install --save @transcend-io/conflux
 import { Reader, Writer } from '@transcend-io/conflux';
 ```
 
-#### CDN
-
-```html
-<script src="https://cdn.jsdelivr.net/npm/@transcend-io/conflux@3"></script>
-```
-
-```js
-// Reader parses zip files, Writer builds zip files
-const { Reader, Writer } = window.conflux;
-```
-
 ### Creating a ZIP
 
 #### Example using `ReadableStream#pipeThrough`
@@ -98,7 +78,7 @@ const { Reader, Writer } = window.conflux;
 import { Writer } from '@transcend-io/conflux';
 import streamSaver from 'streamsaver';
 
-const s3 = 'https://s3-us-west-2.amazonaws.com/bencmbrook/';
+const s3 = 'https://s3-us-west-2.amazonaws.com/your-bucket/';
 const files = ['NYT.txt', 'water.png', 'Earth.jpg'].values();
 
 const myReadable = new ReadableStream({
@@ -165,7 +145,7 @@ const fileStream = streamSaver.createWriteStream('conflux.zip');
   });
 
   const imgStream = await fetch(
-    'https://s3-us-west-2.amazonaws.com/bencmbrook/Earth.jpg',
+    'https://s3-us-west-2.amazonaws.com/your-bucket/Earth.jpg',
   ).then((r) => r.body);
 
   writer.write({
@@ -195,32 +175,6 @@ fetch('https://cdn.jsdelivr.net/gh/Stuk/jszip/test/ref/deflate.zip').then(
 );
 ```
 
-## Supporting Firefox
-
-Firefox [does not support ReadableStream#pipeThrough](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream#browser_compatibility), since it does not have `WritableStream` or `TransformStream` support yet. Conflux ponyfills `TransformStream` out of the box in Firefox, but if you're using the `myReadable.pipeThrough` and plan to support Firefox, you'll want to ponyfill `ReadableStream` like so:
-
-```js
-import { ReadableStream as ReadableStreamPonyfill } from 'web-streams-polyfill/ponyfill';
-
-// Support Firefox with a ponyfill on ReadableStream to add .pipeThrough
-const ModernReadableStream = window.WritableStream
-  ? window.ReadableStream
-  : ReadableStreamPonyfill;
-
-const myReadable = new ModernReadableStream({
-  async pull(controller) {
-    return controller.enqueue({
-      name: `/firefox.txt`,
-      stream: () => new Response.body('Firefox works!'),
-    });
-  },
-});
-
-myReadable
-  .pipeThrough(new Writer()) // see "Supporting Firefox" below
-  .pipeTo(streamSaver.createWriteStream('conflux.zip'));
-```
-
 ## License
 
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Ftranscend-io%2Fconflux.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2Ftranscend-io%2Fconflux?ref=badge_large)
diff --git a/benchmark/index.html b/benchmark/index.html
@@ -7,7 +7,6 @@
   </head>
   <body>
     <p id="loading">Benchmarking...</p>
-    <!-- <script src="https://cdn.jsdelivr.net/npm/web-streams-polyfill@2.0.2/dist/polyfill.min.js"></script> -->
     <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.11/lodash.min.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/benchmark@2.1.4/benchmark.min.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/jszip@3.2.2/dist/jszip.min.js"></script>

diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@transcend-io/conflux",
-  "version": "4.1.2",
+  "version": "5.0.0",
   "description": "Build zip files out of readable streams in the browser",
   "main": "dist/conflux.umd.min.js",
   "jsdelivr": "dist/conflux.umd.min.js",
@@ -98,10 +98,7 @@
     "tape": "^5.7.2"
   },
   "dependencies": {
-    "@babel/runtime-corejs3": "^7.23.5",
-    "jsbi": "^4.3.0",
-    "pako": "^2.1.0",
-    "web-streams-polyfill": "^3.2.1"
+    "pako": "^2.1.0"
   },
   "packageManager": "yarn@4.5.3"
 }
diff --git a/rollup.config.js b/rollup.config.js
@@ -1,25 +1,8 @@
 import resolve from '@rollup/plugin-node-resolve';
 import commonjs from '@rollup/plugin-commonjs';
-import babel from '@rollup/plugin-babel';
 import { terser } from 'rollup-plugin-terser';
 import pkg from './package.json';
 
-const babelDefaults = {
-  // see: https://github.com/rollup/plugins/tree/master/packages/babel#babelhelpers and the note about @babel/runtime for CJS/ES
-  babelHelpers: 'runtime',
-  configFile: './babel.config.js',
-  plugins: [
-    [
-      '@babel/plugin-transform-runtime',
-      {
-        regenerator: true,
-        corejs: { version: 3, proposals: true },
-      },
-    ],
-  ],
-  exclude: ['node_modules/**'],
-};
-
 export default [
   // browser-friendly UMD build
   {
@@ -34,7 +17,6 @@ export default [
     plugins: [
       resolve(), // so Rollup can find package dependencies
       commonjs(), // so Rollup can convert package dependencies to an ES module
-      babel(babelDefaults),
       terser(),
     ],
   },
@@ -47,11 +29,10 @@ export default [
   // `file` and `format` for each target)
   {
     input: 'src/index.js',
-    external: [/pako/, /jsbi/, /web-streams-polyfill/, /@babel\/runtime/],
+    external: [/pako/],
     output: [
       // { file: pkg.main, format: 'cjs' }, // don't need a Node import yet
       { file: pkg.module, format: 'es' },
     ],
-    plugins: [babel(babelDefaults)],
   },
 ];
diff --git a/src/bigint.js b/src/bigint.js
@@ -1,18 +1,21 @@
 /* global globalThis BigInt */
 
-import JSBI from 'jsbi';
-
-// eslint-disable-next-line import/no-mutable-exports
-let jsbi;
-
 /**
- * If BigInt is natively supported, change JSBI to use native expressions
- * @see https://github.com/GoogleChromeLabs/jsbi/blob/master/jsbi.d.ts
- * @see https://github.com/GoogleChromeLabs/babel-plugin-transform-jsbi-to-bigint/blob/master/src/index.js
+ * Use JSBI syntax for BigInt operations, instead of calling BigInt directly.
+ *
+ * This is NOT a polyfill. This uses native BigInt. Using this syntax simply makes it possible to polyfill BigInt.
+ * If BigInt is not natively supported (ES2020+), library consumer MUST expose globalThis.JSBI before using Conflux.
+ *
+ * @see https://github.com/GoogleChromeLabs/jsbi - JSBI library for why BigInt
+ * @see https://github.com/GoogleChromeLabs/jsbi/blob/master/jsbi.d.ts - types
  */
-if (globalThis.BigInt) {
-  jsbi = {};
+if (!globalThis.BigInt) {
+  throw new Error('BigInt is not supported in this browser');
+}
+
+const jsbi = globalThis.JSBI || {};
 
+if (!jsbi.BigInt) {
   // constructor
   jsbi.BigInt = (a) => BigInt(a);
 
@@ -52,8 +55,6 @@ if (globalThis.BigInt) {
   // static methods
   jsbi.asIntN = (a, b) => BigInt.asIntN(a, b);
   jsbi.asUintN = (a, b) => BigInt.asUintN(a, b);
-} else {
-  jsbi = JSBI;
 }
 
 export default jsbi;
diff --git a/src/write.js b/src/write.js
@@ -1,13 +1,10 @@
-/* global globalThis */
 /**
  * Conflux
  * Build (and read) zip files with whatwg streams in the browser.
  *
  * @author Transcend Inc. <https://transcend.io>
  * @license MIT
  */
-// eslint-disable-next-line import/extensions
-import { TransformStream as PonyfillTransformStream } from 'web-streams-polyfill/ponyfill';
 import JSBI from './bigint.js';
 import Crc32 from './crc.js';
 
@@ -93,6 +90,7 @@ class ZipTransformer {
       zipObject.crc = new Crc32();
       const reader = entry.stream().getReader();
 
+      // eslint-disable-next-line no-constant-condition
       while (true) {
         const it = await reader.read();
         if (it.done) break;
@@ -167,12 +165,7 @@ class ZipTransformer {
   }
 }
 
-const ModernTransformStream =
-  globalThis.TransformStream ||
-  globalThis.WebStreamsPolyfill?.TransformStream ||
-  PonyfillTransformStream;
-
-class Writer extends ModernTransformStream {
+class Writer extends TransformStream {
   constructor() {
     super(new ZipTransformer());
   }

diff --git a/yarn.lock b/yarn.lock
@@ -1329,16 +1329,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/runtime-corejs3@npm:^7.23.5":
-  version: 7.23.5
-  resolution: "@babel/runtime-corejs3@npm:7.23.5"
-  dependencies:
-    core-js-pure: "npm:^3.30.2"
-    regenerator-runtime: "npm:^0.14.0"
-  checksum: 10c0/9bbad4ae7efea21e2c92ddee70b42ce9773a56e044cfc16267f9610b38ee531c87b465d84d39433fca93f7f567b47d5e40383e3d2cfe85dbeceea7fba8a52cc8
-  languageName: node
-  linkType: hard
-
 "@babel/runtime@npm:^7.8.4":
   version: 7.23.5
   resolution: "@babel/runtime@npm:7.23.5"
@@ -1871,7 +1861,6 @@ __metadata:
     "@babel/plugin-transform-classes": "npm:^7.23.5"
     "@babel/plugin-transform-runtime": "npm:^7.23.4"
     "@babel/preset-env": "npm:^7.23.5"
-    "@babel/runtime-corejs3": "npm:^7.23.5"
     "@rollup/plugin-babel": "npm:^6.0.4"
     "@rollup/plugin-commonjs": "npm:^25.0.7"
     "@rollup/plugin-json": "npm:^6.0.1"
@@ -1885,7 +1874,6 @@ __metadata:
     eslint-config-airbnb-base: "npm:^15.0.0"
     eslint-plugin-import: "npm:2.29.0"
     git-rev-sync: "npm:^3.0.2"
-    jsbi: "npm:^4.3.0"
     karma: "npm:^6.4.4"
     karma-browserstack-launcher: "npm:^1.6.0"
     karma-chrome-launcher: "npm:^3.2.0"
@@ -1900,7 +1888,6 @@ __metadata:
     rollup-plugin-node-polyfills: "npm:^0.2.1"
     rollup-plugin-terser: "npm:^7.0.2"
     tape: "npm:^5.7.2"
-    web-streams-polyfill: "npm:^3.2.1"
   languageName: unknown
   linkType: soft
 
@@ -3297,13 +3284,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"core-js-pure@npm:^3.30.2":
-  version: 3.33.3
-  resolution: "core-js-pure@npm:3.33.3"
-  checksum: 10c0/97cf39cc013f6a4f77700762de36b495228b3c087fc04b61e86bfbfb475595529966cabbcf37e738e3a468c486e815c85118d120cc6fc4960da08a14caf69826
-  languageName: node
-  linkType: hard
-
 "core-js@npm:^2.4.0, core-js@npm:^2.5.0":
   version: 2.6.12
   resolution: "core-js@npm:2.6.12"
@@ -5780,13 +5760,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"jsbi@npm:^4.3.0":
-  version: 4.3.0
-  resolution: "jsbi@npm:4.3.0"
-  checksum: 10c0/1817ac1b50ea3f4438bcd84cadc9aee7a8657829f65b55ea6f151f401dbbd3babedbfdd3e4f481bd7b5472abb7823efa640fd7e5eee7c30cea6431f7a8b74696
-  languageName: node
-  linkType: hard
-
 "jsesc@npm:^2.5.1":
   version: 2.5.2
   resolution: "jsesc@npm:2.5.2"
@@ -8714,13 +8687,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"web-streams-polyfill@npm:^3.2.1":
-  version: 3.2.1
-  resolution: "web-streams-polyfill@npm:3.2.1"
-  checksum: 10c0/70ed6b5708e14afa2ab699221ea197d7c68ec0c8274bbe0181aecc5ba636ca27cbd383d2049f0eb9d529e738f5c088825502b317f3df24d18a278e4cc9a10e8b
-  languageName: node
-  linkType: hard
-
 "webidl-conversions@npm:^3.0.0":
   version: 3.0.1
   resolution: "webidl-conversions@npm:3.0.1"