Runtime reference

Timers

Global timer functions, behaving like their browser counterparts.

F setTimeout

setTimeout(callback: (...args: any[]) => void, delay: number, ...args: any[]): number

Runs callback once after delay ms. Returns a timer ID.

F clearTimeout

clearTimeout(id: number): void

Cancels a pending timeout. Safe to call with an invalid ID.

F setInterval

setInterval(callback: (...args: any[]) => void, period: number, ...args: any[]): number

Runs callback repeatedly every period ms. Returns a timer ID.

F clearInterval

clearInterval(id: number): void

Cancels a repeating interval.

F queueMicrotask

queueMicrotask(callback: () => void): void

Queues callback as a microtask, before the next timer/IO callback.

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O console

All output is forwarded to the daemon event stream and, if a PTY is attached, written directly to it. Arguments are space-joined. No %s / %d printf-style substitution.

F console.log

log(...args: any[]): void

Logs at INFO level.

F console.info

info(...args: any[]): void

Logs at INFO level.

F console.warn

warn(...args: any[]): void

Logs at WARN level.

F console.error

error(...args: any[]): void

Logs at ERROR level.

F console.debug

debug(...args: any[]): void

Logs at DEBUG level.

F console.assert

assert(condition: boolean, ...args: any[]): void

Logs at ERROR level if condition is falsy. No-op otherwise.

F console.clear

clear(): void

Sends ANSI clear-screen.

F console.count

count(label?: string): void

Increments and prints a named counter.

F console.countReset

countReset(label?: string): void

Resets the named counter.

F console.dir

dir(obj: any): void

Pretty-prints an object.

F console.group

group(...args: any[]): void

Logs and increases the indent level.

F console.groupEnd

groupEnd(): void

Decreases the indent level.

F console.table

table(data: any[] | Record<string, any>): void

Formats an array or object as an ASCII table.

F console.time

time(label?: string): void

Starts a named timer.

F console.timeLog

timeLog(label?: string): void

Logs elapsed time without stopping the timer.

F console.timeEnd

timeEnd(label?: string): void

Logs elapsed time and stops the timer.

F console.trace

trace(...args: any[]): void

Logs "Trace: ..." with optional args.

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V8 built-ins

All standard ECMAScript built-ins are available: Array, Object, Map, Set, WeakMap, WeakSet, Promise, Proxy, Reflect, Symbol, BigInt, RegExp, Date, Error, JSON, Math, ArrayBuffer, TypedArrays, DataView, WeakRef, FinalizationRegistry, structuredClone, globalThis.

No ICU

This V8 build is compiled without ICU. The Intl.* namespace is unsafe to use. In particular, String.prototype.localeCompare throws RangeError: Internal error. Icu error. Use plain < / > comparisons for sorting and format numbers/dates manually.

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What is NOT available

Node.js / Deno APIs

Missing API	Notes
process	No process.env, process.argv, process.exit(), etc. Use yeet.args for arguments.
require()	Use import / ES modules only.
__dirname / __filename	Not defined.
Buffer	Use Uint8Array / ArrayBuffer.
fs	No file system access.
path / os	Not available.
child_process / exec	No subprocess spawning.
net / http / https	No socket or HTTP APIs.
setImmediate	Use queueMicrotask() or setTimeout(fn, 0).
performance	No performance.now().

Browser APIs

Missing API	Notes
fetch	No HTTP client. Data comes through yeet.graph.
WebSocket	Not available.
crypto / SubtleCrypto	Not available.
TextEncoder / TextDecoder	Not present. For string → bytes, use toUTF8 / toUTF16 / toUTF32 from yeet:tui:text.
URL / URLSearchParams	Not present.
AbortController / AbortSignal	Not present.
Event / EventTarget	No DOM event system.
Worker / SharedArrayBuffer / Atomics	No threading.
localStorage / sessionStorage	Not available.
document / DOM	No DOM.
requestAnimationFrame	Use setInterval.
XMLHttpRequest / FormData / Blob	Not present.
ReadableStream / WritableStream	No WHATWG streams.