Globals

The global constructors, functions, objects, and values that every Azion Runtime function can use without an import.

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Azion Runtime gives every function a set of global names that the code uses without an import: JavaScript built-ins, Web APIs, the Azion APIs, and some Node.js globals. The lists on this page are the names the deployed runtime exposes, grouped by the type typeof returns for each. self and globalThis are the same object.

Under azion dev, caches, upgradeWebSocket, WebSocket, and CustomEvent are not defined, and globalThis.dispatchEvent is not a function. queueMicrotask is defined locally but not deployed. EdgeRuntime holds "edge-runtime", and Date.now() advances during a request.

Constructors and functions

These globals are functions, so typeof returns function for each of them:

  • Object
  • Function
  • Array
  • Number
  • parseFloat
  • parseInt
  • Boolean
  • String
  • Symbol
  • Date
  • Promise
  • RegExp
  • Error
  • AggregateError
  • EvalError
  • RangeError
  • ReferenceError
  • SyntaxError
  • TypeError
  • URIError
  • ArrayBuffer
  • Uint8Array
  • Int8Array
  • Uint16Array
  • Int16Array
  • Uint32Array
  • Int32Array
  • Float32Array
  • Float64Array
  • Uint8ClampedArray
  • BigUint64Array
  • BigInt64Array
  • DataView
  • Map
  • BigInt
  • Set
  • WeakMap
  • WeakSet
  • Proxy
  • decodeURI
  • decodeURIComponent
  • encodeURI
  • encodeURIComponent
  • escape
  • unescape
  • isFinite
  • isNaN
  • Event
  • EventTarget
  • CustomEvent
  • dispatchEvent
  • addEventListener
  • removeEventListener
  • AbortSignal
  • AbortController
  • Blob
  • Buffer: the Node.js Buffer class. For more information, refer to node
    .
  • Cache and CacheStorage: the classes of the Cache API.
  • Crypto
  • CryptoKey
  • CountQueuingStrategy
  • DOMException
  • FormData
  • Headers
  • ReadableStream
  • ReadableStreamBYOBReader
  • ReadableStreamDefaultReader
  • Request
  • Response
  • SubtleCrypto
  • TextDecoder
  • TextEncoder
  • TransformStream
  • URL
  • URLPattern
  • URLSearchParams
  • WritableStream
  • WritableStreamDefaultWriter
  • atob
  • btoa
  • clearTimeout
  • fetch
  • setTimeout
  • setInterval
  • setImmediate
  • clearImmediate
  • structuredClone
  • ExtendableEvent
  • FetchEvent
  • FirewallEvent
  • clearInterval
  • SharedArrayBuffer
  • CompressionStream
  • DecompressionStream
  • TextDecoderStream
  • TextEncoderStream
  • upgradeWebSocket and WebSocket: the functions of the WebSocket API.

globalThis is an EventTarget, so the global addEventListener, removeEventListener, and dispatchEvent act on it.

ExtendableEvent, FetchEvent, and FirewallEvent are defined, but a function cannot construct them: new FetchEvent('fetch') throws TypeError: Illegal constructor. The runtime creates the FetchEvent that a fetch listener receives from addEventListener.

Objects

These globals are objects, so typeof returns object for each of them:

Numeric values

These globals are numbers:

  • Infinity
  • NaN

Other values

GlobalTypeValue
undefinedundefinedundefined
EdgeRuntimeString"azion"

Time inside a request

In a deployed function, Date.now() returns the same value for the whole request. It does not advance across a loop, a timer, or a fetch() call, and its milliseconds read 0. To measure elapsed time inside a request, use performance.now(): it advances during the request and starts at 0.

Web APIs

The reference pages of the Web APIs that these globals expose.

Web standards

The standards that Azion Runtime implements, and what it refuses.

Node.js APIs

The Node.js modules that a function imports, beside the Buffer and process globals.

How Azion Runtime works

How the deployed runtime differs from azion dev on your machine.