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+# @rolldown/plugin-node-polyfills
+
+This is a node polyfills plugin for [Rolldown](https://rolldown.rs/), largely based on the original [rollup-plugin-polyfill-node](https://github.com/FredKSchott/rollup-plugin-polyfill-node) by @fks, which is in turn a fork of [rollup-plugin-node-polyfills](https://github.com/ionic-team/rollup-plugin-node-polyfills).
+
+The reason for a Rolldown-specific version is because Rolldown natively supports [esbuild-style `inject` option](https://esbuild.github.io/api/#inject), which removes the need for [@rollup/plugin-inject](https://github.com/rollup/plugins/tree/master/packages/inject#readme), which is used to inject polyfills for globals like `Buffer`. Rolldown's native `inject` is many times more efficient than a plugin because it completely avoids extra AST parse and traversals.
+
+## Quickstart
+
+```
+npm install --save-dev @rolldown/plugin-node-polyfills
+```
+
+```js
+import { rolldown } from 'rolldown'
+import nodePolyfills from '@rolldown/plugin-node-polyfills'
+
+rolldown({
+  entry: 'main.js',
+  plugins: [nodePolyfills()]
+})
+```
+
+## Node.js Builtin Support Table
+
+The following modules include ES6 specific version which allow you to do named imports in addition to the default import and should work fine if you only use this plugin.
+
+- process*
+- events
+- stream*
+- util*
+- path
+- buffer*
+- querystring
+- url*
+- string_decoder*
+- punycode
+- http*†
+- https*†
+- os*
+- assert*
+- constants
+- timers*
+- console*‡
+- vm*§
+- zlib*
+- tty
+- domain
+- dns∆
+- dgram∆
+- child_process∆
+- cluster∆
+- module∆
+- net∆
+- readline∆
+- repl∆
+- tls∆
+- fs˚
+- crypto˚
+- perf_hooks˚ - **New:* just an empty shim for now, but would love help building a true polyfill!*
+
+
+† the http and https modules are actually the same and don't differentiate based on protocol
+
+‡ default export only, because it's console, seriously just use the global
+
+§ vm does not have all corner cases and has less of them in a web worker
+
+∆ not shimmed, just returns mock
+
+˚ shimmed, but too complex to polyfill fully. Avoid if at all possible. Some bugs and partial support expected. 
+
+Not all included modules bundle equally, streams (and by extension anything that requires it like http) are a mess of circular references that are pretty much impossible to tree-shake out, similarly url methods are actually a shortcut to a url object so those methods don't tree shake out very well, punycode, path, querystring, events, util, and process tree shake very well especially if you do named imports.