From 8968a8c6e7298b86fda7943072658db2813277d8 Mon Sep 17 00:00:00 2001
From: Neal Beeken <neal.beeken@mongodb.com>
Date: Mon, 28 Sep 2020 16:46:59 -0400
Subject: [PATCH 1/3] fix: :hammer: Rework rollup config to output named
 exports

Rollup's output was bundling the library to have one single default export this change makes the output preserve the named outputs. In addition the rollup config now compiles from typescript instead of from the typescript output.
---
 package-lock.json    | 10 ++++++
 package.json         |  1 +
 rollup.config.js     | 83 +++++++++++++++++++++++++++++++-------------
 src/bson.ts          | 66 +++++++++++++++++++++++++++++++++++
 src/objectid.ts      |  2 +-
 tsconfig.rollup.json | 32 +++++++++++++++++
 6 files changed, 169 insertions(+), 25 deletions(-)
 create mode 100644 tsconfig.rollup.json

diff --git a/package-lock.json b/package-lock.json
index 80e61eff..ea967452 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1217,6 +1217,16 @@
         "resolve": "^1.17.0"
       }
     },
+    "@rollup/plugin-typescript": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-typescript/-/plugin-typescript-6.0.0.tgz",
+      "integrity": "sha512-Y5U2L4eaF3wUSgCZRMdvNmuzWkKMyN3OwvhAdbzAi5sUqedaBk/XbzO4T7RlViDJ78MOPhwAIv2FtId/jhMtbg==",
+      "dev": true,
+      "requires": {
+        "@rollup/pluginutils": "^3.1.0",
+        "resolve": "^1.17.0"
+      }
+    },
     "@rollup/pluginutils": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-3.1.0.tgz",
diff --git a/package.json b/package.json
index d95142f7..bcfc5c1d 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "@rollup/plugin-commonjs": "^15.0.0",
     "@rollup/plugin-json": "^4.1.0",
     "@rollup/plugin-node-resolve": "^9.0.0",
+    "@rollup/plugin-typescript": "^6.0.0",
     "@typescript-eslint/eslint-plugin": "^3.10.1",
     "@typescript-eslint/parser": "^3.10.1",
     "benchmark": "^2.1.4",
diff --git a/rollup.config.js b/rollup.config.js
index 34b26976..94e2422b 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,45 +1,72 @@
-import babel from '@rollup/plugin-babel';
+import { getBabelOutputPlugin } from '@rollup/plugin-babel';
 const commonjs = require('@rollup/plugin-commonjs');
 const { nodeResolve } = require('@rollup/plugin-node-resolve');
 const nodePolyfills = require('rollup-plugin-node-polyfills');
+import typescript from '@rollup/plugin-typescript';
 
 // Entry point of the library
-const input = './lib/bson.js';
+const input = './src/bson.ts';
 
 export default [
+  {
+    input,
+    /* Browser ESM bundle */
+    output: {
+      file: 'dist/bson.browser.esm.js',
+      format: 'esm',
+      exports: 'named',
+      sourcemap: true
+    },
+    plugins: [
+      typescript({ tsconfig: './tsconfig.rollup.json' }),
+      nodeResolve({ preferBuiltins: false }),
+      commonjs(),
+      nodePolyfills(),
+      getBabelOutputPlugin({
+        presets: [
+          [
+            '@babel/preset-env',
+            {
+              modules: false,
+              targets: { ie: 8, node: 6 }
+            }
+          ]
+        ]
+      })
+    ]
+  },
   {
     input,
     output: [
-      /* Browser ESM bundle */
-      {
-        file: 'dist/bson.browser.esm.js',
-        format: 'es'
-      },
       /* Browser UMD bundle */
       {
         file: 'dist/bson.browser.umd.js',
-        format: 'umd',
-        name: 'BSON'
+        format: 'esm',
+        name: 'BSON',
+        sourcemap: true
       },
-      /* Browser IIFE bundle */
-      {
+      /* Browser IIFE bundle */ {
         file: 'dist/bson.bundle.js',
-        format: 'iife',
-        name: 'BSON'
+        format: 'esm',
+        name: 'BSON',
+        sourcemap: true
       }
     ],
-
     plugins: [
+      typescript({ tsconfig: './tsconfig.rollup.json' }),
       nodeResolve({ preferBuiltins: false }),
       commonjs(),
-      nodePolyfills({ include: ['buffer'] }),
-      babel({
-        babelHelpers: 'bundled',
+      nodePolyfills(),
+      getBabelOutputPlugin({
+        allowAllFormats: true,
+        moduleId: 'BSON', // names the IIFE/UMD module
+        // babelHelpers: 'bundled',
         presets: [
           [
-            '@babel/env',
+            '@babel/preset-env',
             {
-              modules: false
+              modules: 'umd',
+              targets: { ie: 8, node: 6 }
             }
           ]
         ]
@@ -49,13 +76,21 @@ export default [
   /* ESM bundle with externals */
   {
     input,
-    output: {
-      file: 'dist/bson.esm.js',
-      format: 'es'
-    },
+    output: [
+      {
+        file: 'dist/bson.esm.js',
+        format: 'esm',
+        exports: 'named',
+        sourcemap: true
+      }
+    ],
     // Notice the external buffer, and preferBuiltins false,
     // this bundle doesn't pull in 'buffer' or Map from 'core-js'
     external: ['buffer'],
-    plugins: [nodeResolve({ preferBuiltins: true }), commonjs()]
+    plugins: [
+      typescript({ tsconfig: './tsconfig.rollup.json' }),
+      nodeResolve({ preferBuiltins: true }),
+      commonjs()
+    ]
   }
 ];
diff --git a/src/bson.ts b/src/bson.ts
index 12bb9105..a67b84e7 100644
--- a/src/bson.ts
+++ b/src/bson.ts
@@ -1,6 +1,7 @@
 import { Buffer } from 'buffer';
 import { Binary } from './binary';
 import { Code } from './code';
+import * as constants from './constants';
 import { DBRef } from './db_ref';
 import { Decimal128 } from './decimal128';
 import { Double } from './double';
@@ -277,3 +278,68 @@ export function deserializeStream(
   // Return object containing end index of parsing and list of documents
   return index;
 }
+
+const bsonDefaultModuleExport = {
+  // constants
+  // NOTE: this is done this way because rollup can't resolve an `Object.assign`ed export
+  BSON_INT32_MAX: constants.BSON_INT32_MAX,
+  BSON_INT32_MIN: constants.BSON_INT32_MIN,
+  BSON_INT64_MAX: constants.BSON_INT64_MAX,
+  BSON_INT64_MIN: constants.BSON_INT64_MIN,
+  JS_INT_MAX: constants.JS_INT_MAX,
+  JS_INT_MIN: constants.JS_INT_MIN,
+  BSON_DATA_NUMBER: constants.BSON_DATA_NUMBER,
+  BSON_DATA_STRING: constants.BSON_DATA_STRING,
+  BSON_DATA_OBJECT: constants.BSON_DATA_OBJECT,
+  BSON_DATA_ARRAY: constants.BSON_DATA_ARRAY,
+  BSON_DATA_BINARY: constants.BSON_DATA_BINARY,
+  BSON_DATA_UNDEFINED: constants.BSON_DATA_UNDEFINED,
+  BSON_DATA_OID: constants.BSON_DATA_OID,
+  BSON_DATA_BOOLEAN: constants.BSON_DATA_BOOLEAN,
+  BSON_DATA_DATE: constants.BSON_DATA_DATE,
+  BSON_DATA_NULL: constants.BSON_DATA_NULL,
+  BSON_DATA_REGEXP: constants.BSON_DATA_REGEXP,
+  BSON_DATA_DBPOINTER: constants.BSON_DATA_DBPOINTER,
+  BSON_DATA_CODE: constants.BSON_DATA_CODE,
+  BSON_DATA_SYMBOL: constants.BSON_DATA_SYMBOL,
+  BSON_DATA_CODE_W_SCOPE: constants.BSON_DATA_CODE_W_SCOPE,
+  BSON_DATA_INT: constants.BSON_DATA_INT,
+  BSON_DATA_TIMESTAMP: constants.BSON_DATA_TIMESTAMP,
+  BSON_DATA_LONG: constants.BSON_DATA_LONG,
+  BSON_DATA_DECIMAL128: constants.BSON_DATA_DECIMAL128,
+  BSON_DATA_MIN_KEY: constants.BSON_DATA_MIN_KEY,
+  BSON_DATA_MAX_KEY: constants.BSON_DATA_MAX_KEY,
+  BSON_BINARY_SUBTYPE_DEFAULT: constants.BSON_BINARY_SUBTYPE_DEFAULT,
+  BSON_BINARY_SUBTYPE_FUNCTION: constants.BSON_BINARY_SUBTYPE_FUNCTION,
+  BSON_BINARY_SUBTYPE_BYTE_ARRAY: constants.BSON_BINARY_SUBTYPE_BYTE_ARRAY,
+  BSON_BINARY_SUBTYPE_UUID: constants.BSON_BINARY_SUBTYPE_UUID,
+  BSON_BINARY_SUBTYPE_MD5: constants.BSON_BINARY_SUBTYPE_MD5,
+  BSON_BINARY_SUBTYPE_USER_DEFINED: constants.BSON_BINARY_SUBTYPE_USER_DEFINED,
+  // wrapped types
+  Code,
+  Map,
+  BSONSymbol,
+  DBRef,
+  Binary,
+  ObjectId,
+  ObjectID: ObjectId,
+  Long,
+  Timestamp,
+  Double,
+  Int32,
+  MinKey,
+  MaxKey,
+  BSONRegExp,
+  Decimal128,
+  // methods
+  serialize,
+  serializeWithBufferAndIndex,
+  deserialize,
+  calculateObjectSize,
+  deserializeStream,
+  setInternalBufferSize,
+  // EJSON namespace
+  EJSON
+};
+
+export default bsonDefaultModuleExport;
diff --git a/src/objectid.ts b/src/objectid.ts
index 3314d066..c6140757 100644
--- a/src/objectid.ts
+++ b/src/objectid.ts
@@ -60,7 +60,7 @@ export class ObjectId {
       this.__id = id.__id;
     }
 
-    if (typeof id === 'object' && 'id' in id) {
+    if (typeof id === 'object' && id && 'id' in id) {
       if ('toHexString' in id && typeof id.toHexString === 'function') {
         this[kId] = Buffer.from(id.toHexString(), 'hex');
       } else {
diff --git a/tsconfig.rollup.json b/tsconfig.rollup.json
new file mode 100644
index 00000000..ed4a6838
--- /dev/null
+++ b/tsconfig.rollup.json
@@ -0,0 +1,32 @@
+{
+  "compilerOptions": {
+    "allowJs": false,
+    "checkJs": false,
+    "strict": true,
+    "alwaysStrict": true,
+    "target": "ES2017",
+    "module": "esnext",
+    "moduleResolution": "node",
+    "lib": [
+      "ES2017",
+      "ES2020.BigInt",
+      "ES2017.TypedArrays"
+    ],
+    // We don't make use of tslib helpers
+    "importHelpers": true,
+    "noEmitHelpers": false,
+    "noEmitOnError": true,
+    // make use of import type where applicable
+    "importsNotUsedAsValues": "error",
+    // Generate separate source maps files with sourceContent included
+    "sourceMap": true,
+    "inlineSourceMap": false,
+    "inlineSources": false,
+    // API-extractor makes use of the declarations, npm script should be cleaning these up
+    "declaration": false,
+    "types": []
+  },
+  "include": [
+    "src/**/*"
+  ]
+}

From 53cb204f67da5dbadfdbe1380832ec5b6ace2548 Mon Sep 17 00:00:00 2001
From: Neal Beeken <neal.beeken@mongodb.com>
Date: Tue, 29 Sep 2020 10:21:22 -0400
Subject: [PATCH 2/3] refactor: :fire: Remove rollup specific TSConfig and
 inline it into the rollup config

---
 rollup.config.js     | 40 ++++++++++++++++++++++++++++++----------
 tsconfig.rollup.json | 32 --------------------------------
 2 files changed, 30 insertions(+), 42 deletions(-)
 delete mode 100644 tsconfig.rollup.json

diff --git a/rollup.config.js b/rollup.config.js
index 94e2422b..98c61b8e 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -7,6 +7,32 @@ import typescript from '@rollup/plugin-typescript';
 // Entry point of the library
 const input = './src/bson.ts';
 
+const tsConfig = {
+  allowJs: false,
+  checkJs: false,
+  strict: true,
+  alwaysStrict: true,
+  target: 'ES2017',
+  module: 'esnext',
+  moduleResolution: 'node',
+  lib: ['ES2017', 'ES2020.BigInt', 'ES2017.TypedArrays'],
+  // We don't make use of tslib helpers
+  importHelpers: true,
+  noEmitHelpers: false,
+  noEmitOnError: true,
+  // make use of import type where applicable
+  importsNotUsedAsValues: 'error',
+  // Generate separate source maps files with sourceContent included
+  sourceMap: true,
+  inlineSourceMap: false,
+  inlineSources: false,
+  // API-extractor makes use of the declarations, npm script should be cleaning these up
+  declaration: false,
+  types: [],
+  tsconfig: false,
+  include: ['src/**/*']
+};
+
 export default [
   {
     input,
@@ -18,7 +44,7 @@ export default [
       sourcemap: true
     },
     plugins: [
-      typescript({ tsconfig: './tsconfig.rollup.json' }),
+      typescript(tsConfig),
       nodeResolve({ preferBuiltins: false }),
       commonjs(),
       nodePolyfills(),
@@ -53,7 +79,7 @@ export default [
       }
     ],
     plugins: [
-      typescript({ tsconfig: './tsconfig.rollup.json' }),
+      typescript(tsConfig),
       nodeResolve({ preferBuiltins: false }),
       commonjs(),
       nodePolyfills(),
@@ -84,13 +110,7 @@ export default [
         sourcemap: true
       }
     ],
-    // Notice the external buffer, and preferBuiltins false,
-    // this bundle doesn't pull in 'buffer' or Map from 'core-js'
-    external: ['buffer'],
-    plugins: [
-      typescript({ tsconfig: './tsconfig.rollup.json' }),
-      nodeResolve({ preferBuiltins: true }),
-      commonjs()
-    ]
+    external: ['buffer'], // don't bundle 'buffer'
+    plugins: [typescript(tsConfig), nodeResolve({ preferBuiltins: true }), commonjs()]
   }
 ];
diff --git a/tsconfig.rollup.json b/tsconfig.rollup.json
deleted file mode 100644
index ed4a6838..00000000
--- a/tsconfig.rollup.json
+++ /dev/null
@@ -1,32 +0,0 @@
-{
-  "compilerOptions": {
-    "allowJs": false,
-    "checkJs": false,
-    "strict": true,
-    "alwaysStrict": true,
-    "target": "ES2017",
-    "module": "esnext",
-    "moduleResolution": "node",
-    "lib": [
-      "ES2017",
-      "ES2020.BigInt",
-      "ES2017.TypedArrays"
-    ],
-    // We don't make use of tslib helpers
-    "importHelpers": true,
-    "noEmitHelpers": false,
-    "noEmitOnError": true,
-    // make use of import type where applicable
-    "importsNotUsedAsValues": "error",
-    // Generate separate source maps files with sourceContent included
-    "sourceMap": true,
-    "inlineSourceMap": false,
-    "inlineSources": false,
-    // API-extractor makes use of the declarations, npm script should be cleaning these up
-    "declaration": false,
-    "types": []
-  },
-  "include": [
-    "src/**/*"
-  ]
-}

From 141db8ae64ee2bc84315270d0eb0cd332502563f Mon Sep 17 00:00:00 2001
From: Neal Beeken <neal.beeken@mongodb.com>
Date: Tue, 29 Sep 2020 17:42:23 -0400
Subject: [PATCH 3/3] reduce rollup config, remove default export from bson.ts

---
 package-lock.json | 908 ++++++++++++++++++++++++++++++++++++++++++++++
 package.json      |   3 +
 rollup.config.js  | 109 +++---
 src/bson.ts       |  66 ----
 4 files changed, 953 insertions(+), 133 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index ea967452..33094db2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -320,6 +320,15 @@
       "integrity": "sha512-X9rD8qqm695vgmeaQ4fvz/o3+Wk4ZzQvSHkDBgpYKxpD4qTAUm88ZKtHkVqIOsYFFbIQ6wQYhC6q7pjqVK0E0Q==",
       "dev": true
     },
+    "@babel/plugin-external-helpers": {
+      "version": "7.10.4",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-external-helpers/-/plugin-external-helpers-7.10.4.tgz",
+      "integrity": "sha512-5mASqSthmRNYVXOphYzlqmR3Y8yp5SZMZhtKDh2DGV3R2PWGLEmP7qOahw66//6m4hjhlpV1bVM7xIJHt1F77Q==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.10.4"
+      }
+    },
     "@babel/plugin-proposal-async-generator-functions": {
       "version": "7.10.5",
       "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-async-generator-functions/-/plugin-proposal-async-generator-functions-7.10.5.tgz",
@@ -1429,6 +1438,23 @@
         "through": ">=2.2.7 <3"
       }
     },
+    "abstract-leveldown": {
+      "version": "0.12.4",
+      "resolved": "https://registry.npmjs.org/abstract-leveldown/-/abstract-leveldown-0.12.4.tgz",
+      "integrity": "sha1-KeGOYy5g5OIh1YECR4UqY9ey5BA=",
+      "dev": true,
+      "requires": {
+        "xtend": "~3.0.0"
+      },
+      "dependencies": {
+        "xtend": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/xtend/-/xtend-3.0.0.tgz",
+          "integrity": "sha1-XM50B7r2Qsunvs2laBEcST9ZZlo=",
+          "dev": true
+        }
+      }
+    },
     "accepts": {
       "version": "1.3.7",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
@@ -1570,6 +1596,26 @@
       "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
       "dev": true
     },
+    "asn1.js": {
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
+      "integrity": "sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==",
+      "dev": true,
+      "requires": {
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.11.9",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.9.tgz",
+          "integrity": "sha512-E6QoYqCKZfgatHTdHzs1RRKP7ip4vvm+EyRUeE2RF0NblwVvb0p6jSVeNTOFxPn26QXN2o6SMfNxKp6kU8zQaw==",
+          "dev": true
+        }
+      }
+    },
     "assertion-error": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
@@ -1657,12 +1703,53 @@
       "integrity": "sha512-1Yj8h9Q+QDF5FzhMs/c9+6UntbD5MkRfRwac8DoEm9ZfUBZ7tZ55YcGVAzEe4bXsdQHEk+s9S5wsOKVdZrw0tQ==",
       "dev": true
     },
+    "bl": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-0.8.2.tgz",
+      "integrity": "sha1-yba8oI0bwuoA/Ir7Txpf0eHGbk4=",
+      "dev": true,
+      "requires": {
+        "readable-stream": "~1.0.26"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
+          "dev": true
+        },
+        "readable-stream": {
+          "version": "1.0.34",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
+          "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
+          "dev": true,
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.1",
+            "isarray": "0.0.1",
+            "string_decoder": "~0.10.x"
+          }
+        },
+        "string_decoder": {
+          "version": "0.10.31",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+          "dev": true
+        }
+      }
+    },
     "blob": {
       "version": "0.0.5",
       "resolved": "https://registry.npmjs.org/blob/-/blob-0.0.5.tgz",
       "integrity": "sha512-gaqbzQPqOoamawKg0LGVd7SzLgXS+JH61oWprSLH+P+abTczqJbhTR8CmJ2u9/bUYNmHTGJx/UEmn6doAvvuig==",
       "dev": true
     },
+    "bn.js": {
+      "version": "5.1.3",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.1.3.tgz",
+      "integrity": "sha512-GkTiFpjFtUzU9CbMeJ5iazkCzGL3jrhzerzZIuqLABjbwRaFt33I9tUdSNryIptM+RxDet6OKm2WnLXzW51KsQ==",
+      "dev": true
+    },
     "body-parser": {
       "version": "1.19.0",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
@@ -1717,12 +1804,109 @@
         "fill-range": "^7.0.1"
       }
     },
+    "brorand": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/brorand/-/brorand-1.1.0.tgz",
+      "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8=",
+      "dev": true
+    },
     "browser-stdout": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
       "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
       "dev": true
     },
+    "browserify-aes": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
+      "integrity": "sha512-+7CHXqGuspUn/Sl5aO7Ea0xWGAtETPXNSAjHo48JfLdPWcMng33Xe4znFvQweqc/uzk5zSOI3H52CYnjCfb5hA==",
+      "dev": true,
+      "requires": {
+        "buffer-xor": "^1.0.3",
+        "cipher-base": "^1.0.0",
+        "create-hash": "^1.1.0",
+        "evp_bytestokey": "^1.0.3",
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "browserify-cipher": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/browserify-cipher/-/browserify-cipher-1.0.1.tgz",
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+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
+      "integrity": "sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "^5.1.0"
+      }
+    },
+    "randomfill": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/randomfill/-/randomfill-1.0.4.tgz",
+      "integrity": "sha512-87lcbR8+MhcWcUiQ+9e+Rwx8MyR2P7qnt15ynUlbm3TU/fjbgz4GsvfSUDTemtCCtVCqb4ZcEFlyPNTh9bBTLw==",
+      "dev": true,
+      "requires": {
+        "randombytes": "^2.0.5",
+        "safe-buffer": "^5.1.0"
+      }
+    },
     "range-parser": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
@@ -5365,6 +6214,16 @@
         "glob": "^7.1.3"
       }
     },
+    "ripemd160": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/ripemd160/-/ripemd160-2.0.2.tgz",
+      "integrity": "sha512-ii4iagi25WusVoiC4B4lq7pbXfAp3D9v5CwfkY33vffw2+pkDjY1D8GaN7spsxvCSx8dkPqOZCEZyfxcmJG2IA==",
+      "dev": true,
+      "requires": {
+        "hash-base": "^3.0.0",
+        "inherits": "^2.0.1"
+      }
+    },
     "rollup": {
       "version": "2.26.11",
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.26.11.tgz",
@@ -5374,6 +6233,27 @@
         "fsevents": "~2.1.2"
       }
     },
+    "rollup-plugin-commonjs": {
+      "version": "10.1.0",
+      "resolved": "https://registry.npmjs.org/rollup-plugin-commonjs/-/rollup-plugin-commonjs-10.1.0.tgz",
+      "integrity": "sha512-jlXbjZSQg8EIeAAvepNwhJj++qJWNJw1Cl0YnOqKtP5Djx+fFGkp3WRh+W0ASCaFG5w1jhmzDxgu3SJuVxPF4Q==",
+      "dev": true,
+      "requires": {
+        "estree-walker": "^0.6.1",
+        "is-reference": "^1.1.2",
+        "magic-string": "^0.25.2",
+        "resolve": "^1.11.0",
+        "rollup-pluginutils": "^2.8.1"
+      },
+      "dependencies": {
+        "estree-walker": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-0.6.1.tgz",
+          "integrity": "sha512-SqmZANLWS0mnatqbSfRP5g8OXZC12Fgg1IwNtLsyHDzJizORW4khDfjPqJZsemPWBB2uqykUah5YpQ6epsqC/w==",
+          "dev": true
+        }
+      }
+    },
     "rollup-plugin-inject": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/rollup-plugin-inject/-/rollup-plugin-inject-3.0.2.tgz",
@@ -5393,6 +6273,18 @@
         }
       }
     },
+    "rollup-plugin-node-builtins": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/rollup-plugin-node-builtins/-/rollup-plugin-node-builtins-2.1.2.tgz",
+      "integrity": "sha1-JKH+1KQyV7a2Q3HYq8bOGrFFl+k=",
+      "dev": true,
+      "requires": {
+        "browserify-fs": "^1.0.0",
+        "buffer-es6": "^4.9.2",
+        "crypto-browserify": "^3.11.0",
+        "process-es6": "^0.11.2"
+      }
+    },
     "rollup-plugin-node-globals": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/rollup-plugin-node-globals/-/rollup-plugin-node-globals-1.4.0.tgz",
@@ -5486,6 +6378,16 @@
       "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw==",
       "dev": true
     },
+    "sha.js": {
+      "version": "2.4.11",
+      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
+      "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==",
+      "dev": true,
+      "requires": {
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
     "shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -5827,6 +6729,12 @@
       "integrity": "sha512-a1uQGz7IyVy9YwhqjZIZu1c8JO8dNIe20xBmSS6qu9kv++k3JGzCVmprbNN5Kn+BgzD5E7YYwg1CcjuJMRNsvg==",
       "dev": true
     },
+    "string-range": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/string-range/-/string-range-1.2.2.tgz",
+      "integrity": "sha1-qJPtNH5yKZvIO++78qaSqNI51d0=",
+      "dev": true
+    },
     "string-width": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
diff --git a/package.json b/package.json
index bcfc5c1d..5ff837bd 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "url": "https://github.com/mongodb/js-bson/issues"
   },
   "devDependencies": {
+    "@babel/plugin-external-helpers": "^7.10.4",
     "@babel/preset-env": "^7.11.0",
     "@istanbuljs/nyc-config-typescript": "^1.0.1",
     "@microsoft/api-extractor": "^7.9.10",
@@ -52,6 +53,8 @@
     "prettier": "^2.1.1",
     "rimraf": "^3.0.2",
     "rollup": "^2.26.5",
+    "rollup-plugin-commonjs": "^10.1.0",
+    "rollup-plugin-node-builtins": "^2.1.2",
     "rollup-plugin-node-globals": "^1.4.0",
     "rollup-plugin-node-polyfills": "^0.2.1",
     "standard-version": "^8.0.1",
diff --git a/rollup.config.js b/rollup.config.js
index 98c61b8e..01edfe57 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,11 +1,9 @@
-import { getBabelOutputPlugin } from '@rollup/plugin-babel';
-const commonjs = require('@rollup/plugin-commonjs');
+const pkg = require('./package.json');
+const commonjs = require('rollup-plugin-commonjs');
+const nodeBuiltins = require('rollup-plugin-node-builtins');
 const { nodeResolve } = require('@rollup/plugin-node-resolve');
-const nodePolyfills = require('rollup-plugin-node-polyfills');
-import typescript from '@rollup/plugin-typescript';
-
-// Entry point of the library
-const input = './src/bson.ts';
+const { babel } = require('@rollup/plugin-babel');
+const typescript = require('@rollup/plugin-typescript');
 
 const tsConfig = {
   allowJs: false,
@@ -13,7 +11,7 @@ const tsConfig = {
   strict: true,
   alwaysStrict: true,
   target: 'ES2017',
-  module: 'esnext',
+  module: 'commonjs',
   moduleResolution: 'node',
   lib: ['ES2017', 'ES2020.BigInt', 'ES2017.TypedArrays'],
   // We don't make use of tslib helpers
@@ -32,85 +30,62 @@ const tsConfig = {
   tsconfig: false,
   include: ['src/**/*']
 };
+const input = 'src/bson.ts';
+
+const plugins = [
+  typescript(tsConfig),
+  nodeResolve({ preferBuiltins: false }),
+  commonjs({ extensions: ['.js', '.ts'] }),
+  nodeBuiltins(),
+  babel({
+    babelHelpers: 'external',
+    plugins: ['@babel/plugin-external-helpers'],
+    presets: [['@babel/env', { modules: false }]]
+  })
+];
+
+const external = Object.keys(pkg.dependencies || {});
+
+const defaultName = 'BSON';
 
-export default [
+module.exports = [
   {
     input,
-    /* Browser ESM bundle */
     output: {
-      file: 'dist/bson.browser.esm.js',
-      format: 'esm',
+      file: 'dist/bson.esm.js',
+      format: 'es',
+      name: defaultName,
       exports: 'named',
       sourcemap: true
     },
-    plugins: [
-      typescript(tsConfig),
-      nodeResolve({ preferBuiltins: false }),
-      commonjs(),
-      nodePolyfills(),
-      getBabelOutputPlugin({
-        presets: [
-          [
-            '@babel/preset-env',
-            {
-              modules: false,
-              targets: { ie: 8, node: 6 }
-            }
-          ]
-        ]
-      })
-    ]
+    plugins,
+    external
   },
   {
     input,
     output: [
-      /* Browser UMD bundle */
       {
         file: 'dist/bson.browser.umd.js',
-        format: 'esm',
-        name: 'BSON',
+        format: 'umd',
+        name: defaultName,
+        exports: 'named',
         sourcemap: true
       },
-      /* Browser IIFE bundle */ {
-        file: 'dist/bson.bundle.js',
-        format: 'esm',
-        name: 'BSON',
+      {
+        file: 'dist/bson.browser.esm.js',
+        format: 'es',
+        name: defaultName,
+        exports: 'named',
         sourcemap: true
-      }
-    ],
-    plugins: [
-      typescript(tsConfig),
-      nodeResolve({ preferBuiltins: false }),
-      commonjs(),
-      nodePolyfills(),
-      getBabelOutputPlugin({
-        allowAllFormats: true,
-        moduleId: 'BSON', // names the IIFE/UMD module
-        // babelHelpers: 'bundled',
-        presets: [
-          [
-            '@babel/preset-env',
-            {
-              modules: 'umd',
-              targets: { ie: 8, node: 6 }
-            }
-          ]
-        ]
-      })
-    ]
-  },
-  /* ESM bundle with externals */
-  {
-    input,
-    output: [
+      },
       {
-        file: 'dist/bson.esm.js',
-        format: 'esm',
+        file: 'dist/bson.bundle.js',
+        format: 'iife',
+        name: defaultName,
         exports: 'named',
         sourcemap: true
       }
     ],
-    external: ['buffer'], // don't bundle 'buffer'
-    plugins: [typescript(tsConfig), nodeResolve({ preferBuiltins: true }), commonjs()]
+    plugins
   }
 ];
diff --git a/src/bson.ts b/src/bson.ts
index a67b84e7..12bb9105 100644
--- a/src/bson.ts
+++ b/src/bson.ts
@@ -1,7 +1,6 @@
 import { Buffer } from 'buffer';
 import { Binary } from './binary';
 import { Code } from './code';
-import * as constants from './constants';
 import { DBRef } from './db_ref';
 import { Decimal128 } from './decimal128';
 import { Double } from './double';
@@ -278,68 +277,3 @@ export function deserializeStream(
   // Return object containing end index of parsing and list of documents
   return index;
 }
-
-const bsonDefaultModuleExport = {
-  // constants
-  // NOTE: this is done this way because rollup can't resolve an `Object.assign`ed export
-  BSON_INT32_MAX: constants.BSON_INT32_MAX,
-  BSON_INT32_MIN: constants.BSON_INT32_MIN,
-  BSON_INT64_MAX: constants.BSON_INT64_MAX,
-  BSON_INT64_MIN: constants.BSON_INT64_MIN,
-  JS_INT_MAX: constants.JS_INT_MAX,
-  JS_INT_MIN: constants.JS_INT_MIN,
-  BSON_DATA_NUMBER: constants.BSON_DATA_NUMBER,
-  BSON_DATA_STRING: constants.BSON_DATA_STRING,
-  BSON_DATA_OBJECT: constants.BSON_DATA_OBJECT,
-  BSON_DATA_ARRAY: constants.BSON_DATA_ARRAY,
-  BSON_DATA_BINARY: constants.BSON_DATA_BINARY,
-  BSON_DATA_UNDEFINED: constants.BSON_DATA_UNDEFINED,
-  BSON_DATA_OID: constants.BSON_DATA_OID,
-  BSON_DATA_BOOLEAN: constants.BSON_DATA_BOOLEAN,
-  BSON_DATA_DATE: constants.BSON_DATA_DATE,
-  BSON_DATA_NULL: constants.BSON_DATA_NULL,
-  BSON_DATA_REGEXP: constants.BSON_DATA_REGEXP,
-  BSON_DATA_DBPOINTER: constants.BSON_DATA_DBPOINTER,
-  BSON_DATA_CODE: constants.BSON_DATA_CODE,
-  BSON_DATA_SYMBOL: constants.BSON_DATA_SYMBOL,
-  BSON_DATA_CODE_W_SCOPE: constants.BSON_DATA_CODE_W_SCOPE,
-  BSON_DATA_INT: constants.BSON_DATA_INT,
-  BSON_DATA_TIMESTAMP: constants.BSON_DATA_TIMESTAMP,
-  BSON_DATA_LONG: constants.BSON_DATA_LONG,
-  BSON_DATA_DECIMAL128: constants.BSON_DATA_DECIMAL128,
-  BSON_DATA_MIN_KEY: constants.BSON_DATA_MIN_KEY,
-  BSON_DATA_MAX_KEY: constants.BSON_DATA_MAX_KEY,
-  BSON_BINARY_SUBTYPE_DEFAULT: constants.BSON_BINARY_SUBTYPE_DEFAULT,
-  BSON_BINARY_SUBTYPE_FUNCTION: constants.BSON_BINARY_SUBTYPE_FUNCTION,
-  BSON_BINARY_SUBTYPE_BYTE_ARRAY: constants.BSON_BINARY_SUBTYPE_BYTE_ARRAY,
-  BSON_BINARY_SUBTYPE_UUID: constants.BSON_BINARY_SUBTYPE_UUID,
-  BSON_BINARY_SUBTYPE_MD5: constants.BSON_BINARY_SUBTYPE_MD5,
-  BSON_BINARY_SUBTYPE_USER_DEFINED: constants.BSON_BINARY_SUBTYPE_USER_DEFINED,
-  // wrapped types
-  Code,
-  Map,
-  BSONSymbol,
-  DBRef,
-  Binary,
-  ObjectId,
-  ObjectID: ObjectId,
-  Long,
-  Timestamp,
-  Double,
-  Int32,
-  MinKey,
-  MaxKey,
-  BSONRegExp,
-  Decimal128,
-  // methods
-  serialize,
-  serializeWithBufferAndIndex,
-  deserialize,
-  calculateObjectSize,
-  deserializeStream,
-  setInternalBufferSize,
-  // EJSON namespace
-  EJSON
-};
-
-export default bsonDefaultModuleExport;