Bun implements the following globals. {% table %} - Global - Source - Notes --- - [`AbortController`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController) - Web -   --- - [`AbortSignal`](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal) - Web -   --- - [`alert`](https://developer.mozilla.org/en-US/docs/Web/API/Window/alert) - Web - Intended for command-line tools --- - [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob) - Web -   --- - [`Buffer`](https://nodejs.org/api/buffer.html#class-buffer) - Node.js - See [Node.js > `Buffer`](https://bun.sh/docs/runtime/nodejs-apis#node-buffer) --- - `Bun` - Bun - Subject to change as additional APIs are added --- - [`ByteLengthQueuingStrategy`](https://developer.mozilla.org/en-US/docs/Web/API/ByteLengthQueuingStrategy) - Web -   --- - [`confirm`](https://developer.mozilla.org/en-US/docs/Web/API/Window/confirm) - Web - Intended for command-line tools --- - [`__dirname`](https://nodejs.org/api/globals.html#__dirname) - Node.js -   --- - [`__filename`](https://nodejs.org/api/globals.html#__filename) - Node.js -   --- - [`atob()`](https://developer.mozilla.org/en-US/docs/Web/API/atob) - Web -   --- - [`btoa()`](https://developer.mozilla.org/en-US/docs/Web/API/btoa) - Web -   --- - `BuildMessage` - Bun -   --- - [`clearImmediate()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/clearImmediate) - Web -   --- - [`clearInterval()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/clearInterval) - Web -   --- - [`clearTimeout()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/clearTimeout) - Web -   --- - [`console`](https://developer.mozilla.org/en-US/docs/Web/API/console) - Web -   --- - [`CountQueuingStrategy`](https://developer.mozilla.org/en-US/docs/Web/API/CountQueuingStrategy) - Web -   --- - [`Crypto`](https://developer.mozilla.org/en-US/docs/Web/API/Crypto) - Web -   --- - [`crypto`](https://developer.mozilla.org/en-US/docs/Web/API/crypto) - Web -   --- - [`CryptoKey`](https://developer.mozilla.org/en-US/docs/Web/API/CryptoKey) - Web -   --- - [`CustomEvent`](https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent) - Web -   --- - [`Event`](https://developer.mozilla.org/en-US/docs/Web/API/Event) - Web - Also [`ErrorEvent`](https://developer.mozilla.org/en-US/docs/Web/API/ErrorEvent) [`CloseEvent`](https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent) [`MessageEvent`](https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent). --- - [`EventTarget`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget) - Web -   --- - [`exports`](https://nodejs.org/api/globals.html#exports) - Node.js -   --- - [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/fetch) - Web -   --- - [`FormData`](https://developer.mozilla.org/en-US/docs/Web/API/FormData) - Web -   --- - [`global`](https://nodejs.org/api/globals.html#global) - Node.js - See [Node.js > `global`](https://bun.sh/docs/runtime/nodejs-apis#global). --- - [`globalThis`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis) - Cross-platform - Aliases to `global` --- - [`Headers`](https://developer.mozilla.org/en-US/docs/Web/API/Headers) - Web -   --- - [`HTMLRewriter`](https://bun.sh/docs/api/html-rewriter) - Cloudflare -   --- - [`JSON`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON) - Web -   --- - [`MessageEvent`](https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent) - Web -   --- - [`module`](https://nodejs.org/api/globals.html#module) - Node.js -   --- - [`performance`](https://developer.mozilla.org/en-US/docs/Web/API/performance) - Web -   --- - [`process`](https://nodejs.org/api/process.html) - Node.js - See [Node.js > `process`](https://bun.sh/docs/runtime/nodejs-apis#node-process) --- - [`prompt`](https://developer.mozilla.org/en-US/docs/Web/API/Window/prompt) - Web - Intended for command-line tools --- - [`queueMicrotask()`](https://developer.mozilla.org/en-US/docs/Web/API/queueMicrotask) - Web -   --- - [`ReadableByteStreamController`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableByteStreamController) - Web -   --- - [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) - Web -   --- - [`ReadableStreamDefaultController`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultController) - Web -   --- - [`ReadableStreamDefaultReader`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultReader) - Web -   --- - [`reportError`](https://developer.mozilla.org/en-US/docs/Web/API/reportError) - Web -   --- - [`require()`](https://nodejs.org/api/globals.html#require) - Node.js -   --- - `ResolveMessage` - Bun -   --- - [`Response`](https://developer.mozilla.org/en-US/docs/Web/API/Response) - Web -   --- - [`Request`](https://developer.mozilla.org/en-US/docs/Web/API/Request) - Web -   --- - [`setImmediate()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/setImmediate) - Web -   --- - [`setInterval()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/setInterval) - Web -   --- - [`setTimeout()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/setTimeout) - Web -   --- - [`ShadowRealm`](https://github.com/tc39/proposal-shadowrealm) - Web - Stage 3 proposal --- - [`SubtleCrypto`](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto) - Web -   --- - [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException) - Web -   --- - [`TextDecoder`](https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder) - Web -   --- - [`TextEncoder`](https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder) - Web -   --- - [`TransformStream`](https://developer.mozilla.org/en-US/docs/Web/API/TransformStream) - Web -   --- - [`TransformStreamDefaultController`](https://developer.mozilla.org/en-US/docs/Web/API/TransformStreamDefaultController) - Web -   --- - [`URL`](https://developer.mozilla.org/en-US/docs/Web/API/URL) - Web -   --- - [`URLSearchParams`](https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams) - Web -   --- - [`WebAssembly`](https://nodejs.org/api/globals.html#webassembly) - Web -   --- - [`WritableStream`](https://developer.mozilla.org/en-US/docs/Web/API/WritableStream) - Web -   --- - [`WritableStreamDefaultController`](https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultController) - Web -   --- - [`WritableStreamDefaultWriter`](https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultWriter) - Web -   {% /table %}