diff --git a/package-lock.json b/package-lock.json
index 20d75064..fd306ef1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@js-temporal/polyfill",
-  "version": "0.3.0",
+  "version": "0.4.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@js-temporal/polyfill",
-      "version": "0.3.0",
+      "version": "0.4.1",
       "license": "ISC",
       "dependencies": {
         "jsbi": "^4.1.0",
@@ -25,6 +25,7 @@
         "@rollup/plugin-typescript": "^8.3.0",
         "@typescript-eslint/eslint-plugin": "^5.7.0",
         "@typescript-eslint/parser": "^5.7.0",
+        "babel-plugin-transform-jsbi-to-bigint": "^1.4.0",
         "eslint": "^8.4.1",
         "eslint-config-prettier": "^8.3.0",
         "eslint-plugin-prettier": "^4.0.0",
@@ -2270,6 +2271,15 @@
         "@babel/core": "^7.0.0-0"
       }
     },
+    "node_modules/babel-plugin-transform-jsbi-to-bigint": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-jsbi-to-bigint/-/babel-plugin-transform-jsbi-to-bigint-1.4.0.tgz",
+      "integrity": "sha512-59f6ClwQBY/SKMVwKV/xoAqH/gnyZ6C5gSSPsEUCLPvvZULCDSE5Y3T62wjNTbpBcFzh0ReYz2mIe3u44mW9UQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/backo2": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
@@ -7067,6 +7077,12 @@
         "@babel/helper-define-polyfill-provider": "^0.3.0"
       }
     },
+    "babel-plugin-transform-jsbi-to-bigint": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-jsbi-to-bigint/-/babel-plugin-transform-jsbi-to-bigint-1.4.0.tgz",
+      "integrity": "sha512-59f6ClwQBY/SKMVwKV/xoAqH/gnyZ6C5gSSPsEUCLPvvZULCDSE5Y3T62wjNTbpBcFzh0ReYz2mIe3u44mW9UQ==",
+      "dev": true
+    },
     "backo2": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
diff --git a/package.json b/package.json
index 2bcc9949..37786c76 100644
--- a/package.json
+++ b/package.json
@@ -16,9 +16,17 @@
         "default": "./dist/index.cjs"
       },
       "./dist/index.cjs"
-    ]
+    ],
+    "./bigint": "./dist/bigint/index.esm.js"
   },
   "types": "./index.d.ts",
+  "typesVersions": {
+    "*": {
+      "bigint": [
+        "./index.d.ts"
+      ]
+    }
+  },
   "scripts": {
     "test": "npm run build && node --no-warnings --experimental-modules --experimental-specifier-resolution=node --icu-data-dir node_modules/full-icu --loader ./test/resolve.source.mjs ./test/all.mjs",
     "test262": "TEST262=1 npm run build && ./test/test262.sh",
@@ -90,6 +98,7 @@
     "@rollup/plugin-typescript": "^8.3.0",
     "@typescript-eslint/eslint-plugin": "^5.7.0",
     "@typescript-eslint/parser": "^5.7.0",
+    "babel-plugin-transform-jsbi-to-bigint": "^1.4.0",
     "eslint": "^8.4.1",
     "eslint-config-prettier": "^8.3.0",
     "eslint-plugin-prettier": "^4.0.0",
diff --git a/rollup.config.js b/rollup.config.js
index 67f4e072..f84f8d8f 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,6 +1,6 @@
 import commonjs from '@rollup/plugin-commonjs';
 import { nodeResolve } from '@rollup/plugin-node-resolve';
-import babel from '@rollup/plugin-babel';
+import babel, { getBabelOutputPlugin } from '@rollup/plugin-babel';
 import replace from '@rollup/plugin-replace';
 import { terser } from 'rollup-plugin-terser';
 import { env } from 'process';
@@ -57,16 +57,21 @@ const external = [
   ...Object.keys(pkg.peerDependencies || {})
 ].map((dep) => new RegExp(dep + '*'));
 
-function outputEntry(file, format) {
+function outputEntry(file, format, plugins = []) {
   return {
     name: libName,
     file,
     format,
     exports: 'named',
-    sourcemap: true
+    sourcemap: true,
+    plugins
   };
 }
 
+const bigintBabelConfig = {
+  plugins: ['transform-jsbi-to-bigint']
+};
+
 const es5BundleBabelConfig = {
   babelHelpers: 'bundled',
   presets: [
@@ -130,16 +135,13 @@ if (isTest262Build) {
       // CJS bundle.
       // Note that because package.json specifies "type":"module", the name of
       // this file MUST end in ".cjs" in order to be treated as a CommonJS file.
-      outputEntry(pkg.main, 'cjs')
+      outputEntry(pkg.main, 'cjs'),
+      // BigInt bundle
+      outputEntry(pkg.exports['./bigint'], 'es', [getBabelOutputPlugin(bigintBabelConfig)])
     ],
     plugins: withPlugins({
       debugBuild: !isProduction,
       optimize: isProduction
-      // Here is where we could insert the JSBI -> native BigInt plugin if we
-      // could find a way to provide a separate bundle for modern browsers
-      // that can use native BigInt.
-      // Maybe use node's exports + a user-defined condition?
-      // https://nodejs.org/api/packages.html#resolving-user-conditions
     })
   };
   // A legacy build that