mirror of
https://github.com/oven-sh/bun
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469 lines
16 KiB
Plaintext
469 lines
16 KiB
Plaintext
---
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title: "Node.js Compatibility"
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description: "Bun's compatibility status with Node.js APIs, modules, and globals"
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---
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Every day, Bun gets closer to 100% Node.js API compatibility. Today, popular frameworks like Next.js, Express, and millions of `npm` packages intended for Node just work with Bun. To ensure compatibility, we run thousands of tests from Node.js' test suite before every release of Bun.
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**If a package works in Node.js but doesn't work in Bun, we consider it a bug in Bun.** Please [open an issue](https://bun.com/issues) and we'll fix it.
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This page is updated regularly to reflect compatibility status of the latest version of Bun. The information below reflects Bun's compatibility with _Node.js v23_.
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## Built-in Node.js modules
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### [`node:assert`](https://nodejs.org/api/assert.html)
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🟢 Fully implemented.
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### [`node:buffer`](https://nodejs.org/api/buffer.html)
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🟢 Fully implemented.
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### [`node:console`](https://nodejs.org/api/console.html)
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🟢 Fully implemented.
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### [`node:dgram`](https://nodejs.org/api/dgram.html)
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🟢 Fully implemented. > 90% of Node.js's test suite passes.
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### [`node:diagnostics_channel`](https://nodejs.org/api/diagnostics_channel.html)
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🟢 Fully implemented.
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### [`node:dns`](https://nodejs.org/api/dns.html)
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🟢 Fully implemented. > 90% of Node.js's test suite passes.
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### [`node:events`](https://nodejs.org/api/events.html)
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🟢 Fully implemented. 100% of Node.js's test suite passes. `EventEmitterAsyncResource` uses `AsyncResource` underneath.
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### [`node:fs`](https://nodejs.org/api/fs.html)
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🟢 Fully implemented. 92% of Node.js's test suite passes.
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### [`node:http`](https://nodejs.org/api/http.html)
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🟢 Fully implemented. Outgoing client request body is currently buffered instead of streamed.
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### [`node:https`](https://nodejs.org/api/https.html)
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🟢 APIs are implemented, but `Agent` is not always used yet.
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### [`node:os`](https://nodejs.org/api/os.html)
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🟢 Fully implemented. 100% of Node.js's test suite passes.
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### [`node:path`](https://nodejs.org/api/path.html)
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🟢 Fully implemented. 100% of Node.js's test suite passes.
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### [`node:punycode`](https://nodejs.org/api/punycode.html)
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🟢 Fully implemented. 100% of Node.js's test suite passes, _deprecated by Node.js_.
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### [`node:querystring`](https://nodejs.org/api/querystring.html)
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🟢 Fully implemented. 100% of Node.js's test suite passes.
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### [`node:readline`](https://nodejs.org/api/readline.html)
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🟢 Fully implemented.
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### [`node:stream`](https://nodejs.org/api/stream.html)
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🟢 Fully implemented.
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### [`node:string_decoder`](https://nodejs.org/api/string_decoder.html)
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🟢 Fully implemented. 100% of Node.js's test suite passes.
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### [`node:timers`](https://nodejs.org/api/timers.html)
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🟢 Recommended to use global `setTimeout`, et. al. instead.
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### [`node:tty`](https://nodejs.org/api/tty.html)
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🟢 Fully implemented.
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### [`node:url`](https://nodejs.org/api/url.html)
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🟢 Fully implemented.
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### [`node:zlib`](https://nodejs.org/api/zlib.html)
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🟢 Fully implemented. 98% of Node.js's test suite passes.
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### [`node:async_hooks`](https://nodejs.org/api/async_hooks.html)
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🟡 `AsyncLocalStorage`, and `AsyncResource` are implemented. v8 promise hooks are not called, and its usage is [strongly discouraged](https://nodejs.org/docs/latest/api/async_hooks.html#async-hooks).
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### [`node:child_process`](https://nodejs.org/api/child_process.html)
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🟡 Missing `proc.gid` `proc.uid`. `Stream` class not exported. IPC cannot send socket handles. Node.js ↔ Bun IPC can be used with JSON serialization.
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### [`node:cluster`](https://nodejs.org/api/cluster.html)
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🟡 Handles and file descriptors cannot be passed between workers, which means load-balancing HTTP requests across processes is only supported on Linux at this time (via `SO_REUSEPORT`). Otherwise, implemented but not battle-tested.
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### [`node:crypto`](https://nodejs.org/api/crypto.html)
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🟡 Missing `secureHeapUsed` `setEngine` `setFips`
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### [`node:domain`](https://nodejs.org/api/domain.html)
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🟡 Missing `Domain` `active`
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### [`node:http2`](https://nodejs.org/api/http2.html)
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🟡 Client & server are implemented (95.25% of gRPC's test suite passes). Missing `options.allowHTTP1`, `options.enableConnectProtocol`, ALTSVC extension, and `http2stream.pushStream`.
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### [`node:module`](https://nodejs.org/api/module.html)
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🟡 Missing `syncBuiltinESMExports`, `Module#load()`. Overriding `require.cache` is supported for ESM & CJS modules. `module._extensions`, `module._pathCache`, `module._cache` are no-ops. `module.register` is not implemented and we recommend using a [`Bun.plugin`](/runtime/plugins) in the meantime.
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### [`node:net`](https://nodejs.org/api/net.html)
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🟢 Fully implemented.
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### [`node:perf_hooks`](https://nodejs.org/api/perf_hooks.html)
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🟡 APIs are implemented, but Node.js test suite does not pass yet for this module.
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### [`node:process`](https://nodejs.org/api/process.html)
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🟡 See [`process`](#process) Global.
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### [`node:sys`](https://nodejs.org/api/util.html)
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🟡 See [`node:util`](#node-util).
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### [`node:tls`](https://nodejs.org/api/tls.html)
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🟡 Missing `tls.createSecurePair`.
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### [`node:util`](https://nodejs.org/api/util.html)
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🟡 Missing `getCallSite` `getCallSites` `getSystemErrorMap` `getSystemErrorMessage` `transferableAbortSignal` `transferableAbortController`
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### [`node:v8`](https://nodejs.org/api/v8.html)
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🟡 `writeHeapSnapshot` and `getHeapSnapshot` are implemented. `serialize` and `deserialize` use JavaScriptCore's wire format instead of V8's. Other methods are not implemented. For profiling, use [`bun:jsc`](/project/benchmarking#javascript-heap-stats) instead.
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### [`node:vm`](https://nodejs.org/api/vm.html)
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🟡 Core functionality and ES modules are implemented, including `vm.Script`, `vm.createContext`, `vm.runInContext`, `vm.runInNewContext`, `vm.runInThisContext`, `vm.compileFunction`, `vm.isContext`, `vm.Module`, `vm.SourceTextModule`, `vm.SyntheticModule`, and `importModuleDynamically` support. Options like `timeout` and `breakOnSigint` are fully supported. Missing `vm.measureMemory` and some `cachedData` functionality.
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### [`node:wasi`](https://nodejs.org/api/wasi.html)
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🟡 Partially implemented.
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### [`node:worker_threads`](https://nodejs.org/api/worker_threads.html)
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🟡 `Worker` doesn't support the following options: `stdin` `stdout` `stderr` `trackedUnmanagedFds` `resourceLimits`. Missing `markAsUntransferable` `moveMessagePortToContext`.
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### [`node:inspector`](https://nodejs.org/api/inspector.html)
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🟡 Partially implemented. `Profiler` API is supported (`Profiler.enable`, `Profiler.disable`, `Profiler.start`, `Profiler.stop`, `Profiler.setSamplingInterval`). Other inspector APIs are not yet implemented.
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### [`node:repl`](https://nodejs.org/api/repl.html)
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🔴 Not implemented.
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### [`node:sqlite`](https://nodejs.org/api/sqlite.html)
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🔴 Not implemented.
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### [`node:test`](https://nodejs.org/api/test.html)
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🟡 Partly implemented. Missing mocks, snapshots, timers. Use [`bun:test`](/test) instead.
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### [`node:trace_events`](https://nodejs.org/api/tracing.html)
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🔴 Not implemented.
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## Node.js globals
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The table below lists all globals implemented by Node.js and Bun's current compatibility status.
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### [`AbortController`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController)
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🟢 Fully implemented.
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### [`AbortSignal`](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal)
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🟢 Fully implemented.
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### [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob)
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🟢 Fully implemented.
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### [`Buffer`](https://nodejs.org/api/buffer.html#class-buffer)
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🟢 Fully implemented.
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### [`ByteLengthQueuingStrategy`](https://developer.mozilla.org/en-US/docs/Web/API/ByteLengthQueuingStrategy)
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🟢 Fully implemented.
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### [`__dirname`](https://nodejs.org/api/globals.html#__dirname)
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🟢 Fully implemented.
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### [`__filename`](https://nodejs.org/api/globals.html#__filename)
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🟢 Fully implemented.
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### [`atob()`](https://developer.mozilla.org/en-US/docs/Web/API/atob)
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🟢 Fully implemented.
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### [`Atomics`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Atomics)
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🟢 Fully implemented.
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### [`BroadcastChannel`](https://developer.mozilla.org/en-US/docs/Web/API/BroadcastChannel)
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🟢 Fully implemented.
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### [`btoa()`](https://developer.mozilla.org/en-US/docs/Web/API/btoa)
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🟢 Fully implemented.
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### [`clearImmediate()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/clearImmediate)
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🟢 Fully implemented.
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### [`clearInterval()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/clearInterval)
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🟢 Fully implemented.
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### [`clearTimeout()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/clearTimeout)
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🟢 Fully implemented.
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### [`CompressionStream`](https://developer.mozilla.org/en-US/docs/Web/API/CompressionStream)
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🟢 Fully implemented.
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### [`console`](https://developer.mozilla.org/en-US/docs/Web/API/console)
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🟢 Fully implemented.
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### [`CountQueuingStrategy`](https://developer.mozilla.org/en-US/docs/Web/API/CountQueuingStrategy)
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🟢 Fully implemented.
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### [`Crypto`](https://developer.mozilla.org/en-US/docs/Web/API/Crypto)
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🟢 Fully implemented.
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### [`SubtleCrypto (crypto)`](https://developer.mozilla.org/en-US/docs/Web/API/crypto)
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🟢 Fully implemented.
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### [`CryptoKey`](https://developer.mozilla.org/en-US/docs/Web/API/CryptoKey)
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🟢 Fully implemented.
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### [`CustomEvent`](https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent)
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🟢 Fully implemented.
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### [`DecompressionStream`](https://developer.mozilla.org/en-US/docs/Web/API/DecompressionStream)
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🟢 Fully implemented.
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### [`Event`](https://developer.mozilla.org/en-US/docs/Web/API/Event)
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🟢 Fully implemented.
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### [`EventTarget`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget)
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🟢 Fully implemented.
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### [`exports`](https://nodejs.org/api/globals.html#exports)
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🟢 Fully implemented.
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### [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/fetch)
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🟢 Fully implemented.
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### [`FormData`](https://developer.mozilla.org/en-US/docs/Web/API/FormData)
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🟢 Fully implemented.
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### [`global`](https://nodejs.org/api/globals.html#global)
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🟢 Implemented. This is an object containing all objects in the global namespace. It's rarely referenced directly, as its contents are available without an additional prefix, e.g. `__dirname` instead of `global.__dirname`.
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### [`globalThis`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis)
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🟢 Aliases to `global`.
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### [`Headers`](https://developer.mozilla.org/en-US/docs/Web/API/Headers)
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🟢 Fully implemented.
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### [`MessageChannel`](https://developer.mozilla.org/en-US/docs/Web/API/MessageChannel)
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🟢 Fully implemented.
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### [`MessageEvent`](https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent)
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🟢 Fully implemented.
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### [`MessagePort`](https://developer.mozilla.org/en-US/docs/Web/API/MessagePort)
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🟢 Fully implemented.
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### [`module`](https://nodejs.org/api/globals.html#module)
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🟢 Fully implemented.
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### [`PerformanceEntry`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEntry)
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🟢 Fully implemented.
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### [`PerformanceMark`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceMark)
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🟢 Fully implemented.
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### [`PerformanceMeasure`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceMeasure)
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🟢 Fully implemented.
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### [`PerformanceObserver`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver)
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🟢 Fully implemented.
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### [`PerformanceObserverEntryList`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserverEntryList)
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🟢 Fully implemented.
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### [`PerformanceResourceTiming`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceResourceTiming)
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🟢 Fully implemented.
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### [`performance`](https://developer.mozilla.org/en-US/docs/Web/API/performance)
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🟢 Fully implemented.
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### [`process`](https://nodejs.org/api/process.html)
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🟡 Mostly implemented. `process.binding` (internal Node.js bindings some packages rely on) is partially implemented. `process.title` is currently a no-op on macOS & Linux. `getActiveResourcesInfo` `setActiveResourcesInfo`, `getActiveResources` and `setSourceMapsEnabled` are stubs. Newer APIs like `process.loadEnvFile` and `process.getBuiltinModule` are not implemented yet.
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### [`queueMicrotask()`](https://developer.mozilla.org/en-US/docs/Web/API/queueMicrotask)
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🟢 Fully implemented.
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### [`ReadableByteStreamController`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableByteStreamController)
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🟢 Fully implemented.
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### [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream)
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🟢 Fully implemented.
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### [`ReadableStreamBYOBReader`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamBYOBReader)
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🟢 Fully implemented.
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### [`ReadableStreamBYOBRequest`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamBYOBRequest)
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🟢 Fully implemented.
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### [`ReadableStreamDefaultController`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultController)
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🟢 Fully implemented.
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### [`ReadableStreamDefaultReader`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultReader)
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🟢 Fully implemented.
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### [`require()`](https://nodejs.org/api/globals.html#require)
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🟢 Fully implemented, including [`require.main`](https://nodejs.org/api/modules.html#requiremain), [`require.cache`](https://nodejs.org/api/modules.html#requirecache), [`require.resolve`](https://nodejs.org/api/modules.html#requireresolverequest-options).
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### [`Response`](https://developer.mozilla.org/en-US/docs/Web/API/Response)
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🟢 Fully implemented.
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### [`Request`](https://developer.mozilla.org/en-US/docs/Web/API/Request)
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🟢 Fully implemented.
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### [`setImmediate()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/setImmediate)
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🟢 Fully implemented.
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### [`setInterval()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/setInterval)
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🟢 Fully implemented.
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### [`setTimeout()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/setTimeout)
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🟢 Fully implemented.
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### [`structuredClone()`](https://developer.mozilla.org/en-US/docs/Web/API/structuredClone)
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🟢 Fully implemented.
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### [`SubtleCrypto`](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto)
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🟢 Fully implemented.
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### [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException)
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🟢 Fully implemented.
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### [`TextDecoder`](https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder)
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🟢 Fully implemented.
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### [`TextDecoderStream`](https://developer.mozilla.org/en-US/docs/Web/API/TextDecoderStream)
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🟢 Fully implemented.
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### [`TextEncoder`](https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder)
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🟢 Fully implemented.
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### [`TextEncoderStream`](https://developer.mozilla.org/en-US/docs/Web/API/TextEncoderStream)
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🟢 Fully implemented.
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### [`TransformStream`](https://developer.mozilla.org/en-US/docs/Web/API/TransformStream)
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🟢 Fully implemented.
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### [`TransformStreamDefaultController`](https://developer.mozilla.org/en-US/docs/Web/API/TransformStreamDefaultController)
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🟢 Fully implemented.
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### [`URL`](https://developer.mozilla.org/en-US/docs/Web/API/URL)
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🟢 Fully implemented.
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### [`URLSearchParams`](https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams)
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🟢 Fully implemented.
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### [`WebAssembly`](https://nodejs.org/api/globals.html#webassembly)
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🟢 Fully implemented.
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### [`WritableStream`](https://developer.mozilla.org/en-US/docs/Web/API/WritableStream)
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🟢 Fully implemented.
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### [`WritableStreamDefaultController`](https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultController)
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🟢 Fully implemented.
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### [`WritableStreamDefaultWriter`](https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultWriter)
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🟢 Fully implemented.
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