feat(NODE-7019): remove react native vendor polyfills (#827)

Author: baileympearson

README.md

@@ -230,7 +230,17 @@ try {
 
 ## React Native
 
-BSON vendors the required polyfills for `TextEncoder`, `TextDecoder`, `atob`, `btoa` imported from React Native and therefore doesn't expect users to polyfill these. One additional polyfill, `crypto.getRandomValues` is recommended and can be installed with the following command:
+js-bson requires the `atob`, `btoa` and `TextEncoder` globals.  Older versions of React Native did not support these global objects, and so 
+[js-bson v5.4.0](https://github.com/mongodb/js-bson/releases/tag/v5.4.0) added support for bundled polyfills for these globals.  Newer versions
+of Hermes includes these globals, and so the polyfills for are no longer needed in the js-bson package.
+
+If you find yourself on a version of React Native that does not have these globals, either:
+
+1. polyfill them yourself
+2. upgrade to a later version of hermes
+3. use a version of js-bson `>=5.4.0` and `<7.0.0`
+
+One additional polyfill, `crypto.getRandomValues` is recommended and can be installed with the following command:
 
 ```sh
 npm install --save react-native-get-random-values

etc/rollup/rollup-plugin-require-vendor/require_vendor.mjs

@@ -1,6 +1,5 @@
 import { nodeResolve } from '@rollup/plugin-node-resolve';
 import typescript from '@rollup/plugin-typescript';
-import { RequireVendor } from './etc/rollup/rollup-plugin-require-vendor/require_vendor.mjs';
 
 /** @type {typescript.RollupTypescriptOptions} */
 const tsConfig = {
@@ -75,7 +74,7 @@ const config = [
   },
   {
     input,
-    plugins: [typescript(tsConfig), new RequireVendor(), nodeResolve({ resolveOnly: [] })],
+    plugins: [typescript(tsConfig), nodeResolve({ resolveOnly: [] })],
     output: {
       file: 'lib/bson.rn.cjs',
       format: 'commonjs',

rollup.config.mjs

@@ -53,17 +53,7 @@ const REQUIRED_FILES = [
   'src/utils/string_utils.ts',
   'src/utils/web_byte_utils.ts',
   'src/utils/latin.ts',
-  'src/parse_utf8.ts',
-  'vendor/base64/base64.js',
-  'vendor/base64/package.json',
-  'vendor/base64/LICENSE-MIT.txt',
-  'vendor/base64/README.md',
-  'vendor/text-encoding/lib/encoding-indexes.js',
-  'vendor/text-encoding/lib/encoding.js',
-  'vendor/text-encoding/index.js',
-  'vendor/text-encoding/package.json',
-  'vendor/text-encoding/LICENSE.md',
-  'vendor/text-encoding/README.md'
+  'src/parse_utf8.ts'
 ].map(f => `package/${f}`);
 
 describe(`Release ${packFile}`, function () {