Web APIs

19 Web platform APIs implemented for GJS using native GNOME libraries (plus @gjsify/web-polyfills meta).

Package	GNOME Libs	Implements
abort-controller	—	AbortController, AbortSignal (.abort, .timeout, .any)
compression-streams	Gio	CompressionStream, DecompressionStream (gzip/deflate/deflate-raw)
dom-events	—	Event, CustomEvent, EventTarget
dom-exception	—	DOMException (WebIDL)
domparser	—	DOMParser.parseFromString with minimal DOM (excalibur-tiled-sized)
eventsource	Soup 3.0	EventSource (Server-Sent Events), TextLineStream
fetch	Soup 3.0, Gio, GLib	fetch(), Request (raw-body via set_request_body_from_bytes), Response, Headers
formdata	—	FormData, File, multipart encoding
gamepad	Manette 0.2	Gamepad, GamepadButton, GamepadEvent, GamepadHapticActuator (dual-rumble)
streams	—	ReadableStream, WritableStream, TransformStream, TextEncoder/DecoderStream
web-globals	—	Meta-register for every Web API global
webaudio	Gst 1.0, GstApp 1.0	AudioContext (GStreamer decodebin + playback chain), AudioBufferSourceNode, GainNode, AudioParam
webcrypto	GLib	SubtleCrypto (AES, RSA-OAEP/PSS, ECDSA, HMAC, PBKDF2, HKDF, ECDH), CryptoKey, getRandomValues, randomUUID
webrtc	Gst 1.0, GstWebRTC 1.0, GstSDP 1.0	Full W3C WebRTC (RTCPeerConnection, RTCDataChannel, RTCRtpSender/Receiver/Transceiver, MediaStream/Track, getUserMedia, RTCDTMFSender, RTCCertificate)
webrtc-native	Gst 1.0, GstWebRTC 1.0	Vala/GObject prebuild — main-thread signal bridges consumed by @gjsify/webrtc
websocket	Soup 3.0	WebSocket, MessageEvent, CloseEvent (NUL-byte-safe text frames, Autobahn-validated)
webstorage	Gio	localStorage, sessionStorage
xmlhttprequest	Soup 3.0, GLib	XMLHttpRequest (responseType: arraybuffer / blob / json / text / document), FakeBlob + temp-file plumbing for URL.createObjectURL

Adwaita for browser targets

Package	Notes
@gjsify/adwaita-web	Web Components (AdwWindow, AdwHeaderBar, AdwPreferencesGroup, AdwCard, AdwSwitchRow, AdwComboRow, AdwSpinRow, AdwToastOverlay, AdwOverlaySplitView) + SCSS partials
@gjsify/adwaita-fonts	Adwaita Sans TTF files + @font-face CSS
@gjsify/adwaita-icons	Adwaita symbolic icons as importable SVG strings

Meta

Package	Purpose
@gjsify/web-polyfills	Umbrella dep — pulls every Web polyfill for scaffolding templates

Usage

Web APIs are available as bare specifiers in GJS builds. The Rolldown plugin handles the aliasing automatically:

// This works in GJS — Soup.Session under the hood
const response = await fetch('https://api.example.com/data');
const data = await response.json();

// WebSocket via Soup.WebsocketConnection
const ws = new WebSocket('wss://echo.example.com');
ws.onmessage = (event) => console.log(event.data);

// WebRTC via GStreamer webrtcbin
const pc = new RTCPeerConnection();
const offer = await pc.createOffer();
await pc.setLocalDescription(offer);