Deno.errors.WouldBlock | Runtime APIs

Manual

Runtime APIs

Go to LatestShow Unstable API

Broadcast Channel

BroadcastChannel

BroadcastChannelEventMap

Cache API

Compression Streams API

CompressionStream

DecompressionStream

Console and Debugging

DOM APIs

StructuredSerializeOptions

PostMessageOptions

Transferable

structuredClone

DOM Events

AddEventListenerOptions

EventListenerOrEventListenerObject

Encoding API

TextEncoderEncodeIntoResult

Errors

Deno.errors.AddrInUse

Deno.errors.AddrNotAvailable

Deno.errors.AlreadyExists

Deno.errors.BadResource

Deno.errors.BrokenPipe

Deno.errors.Busy

Deno.errors.ConnectionAborted

Deno.errors.ConnectionRefused

Deno.errors.ConnectionReset

Deno.errors.FilesystemLoop

Deno.errors.Http

Deno.errors.Interrupted

Deno.errors.InvalidData

Deno.errors.IsADirectory

Deno.errors.NetworkUnreachable

Deno.errors.NotADirectory

Deno.errors.NotConnected

Deno.errors.NotFound

Deno.errors.NotSupported

Deno.errors.PermissionDenied

Deno.errors.TimedOut

Deno.errors.UnexpectedEof

Deno.errors.WouldBlock

Deno.errors.WriteZero

ES Modules

Fetch API

File System

Deno.WriteFileOptions

Deno.makeTempFileSync

Deno.readTextFileSync

Deno.writeTextFileSync

HTTP Server

Deno.HttpConn

Deno.HttpServer

Deno.RequestEvent

Deno.ServeHandlerInfo

I/O

Network

Deno.ConnectTlsOptions

Deno.Listener

Deno.ListenOptions

Deno.ListenTlsOptions

Deno.MXRecord

Deno.NAPTRRecord

Deno.NetAddr

Deno.NetworkInterfaceInfo

Deno.ResolveDnsOptions

Deno.TcpListenOptions

Deno.TlsConn

Deno.TlsHandshakeInfo

Deno.networkInterfaces

Observability

PromiseRejectionEvent

PromiseRejectionEventInit

Performance

PerformanceMarkOptions

PerformanceMeasure

PerformanceMeasureOptions

PerformanceEntryList

performance

Permissions

Deno.Permissions

Deno.PermissionStatus

Deno.EnvPermissionDescriptor

Deno.FfiPermissionDescriptor

Deno.HrtimePermissionDescriptor

Deno.NetPermissionDescriptor

Deno.PermissionOptionsObject

Deno.PermissionStatusEventMap

Deno.ReadPermissionDescriptor

Deno.RunPermissionDescriptor

Deno.SysPermissionDescriptor

Deno.WritePermissionDescriptor

Deno.PermissionDescriptor

Deno.PermissionName

Deno.PermissionOptions

Runtime Environment

Deno.SystemMemoryInfo

Deno.addSignalListener

Deno.removeSignalListener

Deno.systemMemoryInfo

Deno.uid

Scheduling

VoidFunction

queueMicrotask

Streams API

ByteLengthQueuingStrategy

CountQueuingStrategy

PipeOptions

QueuingStrategy

QueuingStrategySizeCallback

ReadableByteStreamController

ReadableByteStreamControllerCallback

ReadableStream

ReadableStreamBYOBReadDoneResult

ReadableStreamBYOBReader

ReadableStreamBYOBReadValueResult

ReadableStreamBYOBRequest

ReadableStreamDefaultController

ReadableStreamDefaultControllerCallback

ReadableStreamDefaultReadDoneResult

ReadableStreamDefaultReader

ReadableStreamDefaultReadValueResult

ReadableStreamErrorCallback

Transformer

TransformStream

TransformStreamDefaultController

TransformStreamDefaultControllerCallback

TransformStreamDefaultControllerTransformCallback

WritableStreamDefaultController

WritableStreamDefaultControllerCloseCallback

WritableStreamDefaultControllerStartCallback

WritableStreamDefaultControllerWriteCallback

WritableStreamDefaultWriter

WritableStreamErrorCallback

ReadableStreamBYOBReadResult

ReadableStreamDefaultReadResult

Sub Process

Testing

Deno.TestStepDefinition

Timers

Typed Arrays

Web APIs

URL

URLPatternComponentResult

Web Crypto API

RsaHashedImportParams

RsaHashedKeyAlgorithm

RsaHashedKeyGenParams

HashAlgorithmIdentifier

Web File API

Web Sockets

Deno.UpgradeWebSocketOptions

Deno.WebSocketUpgrade

WebSocket

WebSocketEventMap

BinaryType

Deno.upgradeWebSocket

Web Storage API

Storage

localStorage

sessionStorage

Web Workers

AbstractWorkerEventMap

Worker

WorkerEventMap

WorkerOptions

WebAssembly

WebAssembly.CompileError

WebAssembly.Global

WebAssembly.Instance

WebAssembly.LinkError

WebAssembly.Memory

WebAssembly.Module

WebAssembly.RuntimeError

WebAssembly.Table

WebAssembly.GlobalDescriptor

WebAssembly.MemoryDescriptor

WebAssembly.ModuleExportDescriptor

WebAssembly.ModuleImportDescriptor

WebAssembly.TableDescriptor

WebAssembly.WebAssemblyInstantiatedSource

WebAssembly.Exports

WebAssembly.ExportValue

WebAssembly.ImportExportKind

WebAssembly.Imports

WebAssembly.ImportValue

WebAssembly.ModuleImports

WebAssembly.TableKind

WebAssembly.ValueType

WebAssembly.compile

WebAssembly.compileStreaming

WebAssembly.instantiate

WebAssembly.instantiateStreaming

WebAssembly.validate

Deno

class Deno.errors.WouldBlock

extends Error

Raised when the underlying operating system would need to block to complete but an asynchronous (non-blocking) API is used.