@gjsify/string_decoder

gjsify

The full JavaScript ecosystem, native on GNOME.

Documentation

Use Node.js APIs, Web APIs, and DOM interfaces in GNOME desktop applications. gjsify provides native implementations backed by GNOME libraries (GLib, Gio, Soup, Cairo, GTK) — so you can use the npm packages and patterns you already know to build native Linux apps.

Features

• 43 Node.js modules — fs, net, http, http2 (h2c + ALPN + native dispatcher), crypto, streams, child_process, sqlite, ws, sab-native (cross-process SharedBuffer), terminal-native, and more
• 19 Web API packages — fetch, XMLHttpRequest, WebSocket, WebCrypto, WebRTC, WebAudio, Streams (BYOB), EventSource, AbortController, DOMParser, Gamepad
• 8 DOM / bridge packages — Canvas2D (Cairo), Canvas2D-core (headless), WebGL (OpenGL ES), DOM elements, event bridge, iframes (WebKit), video (gtk4paintablesink), bridge-types
• 3 Adwaita packages for browser targets — Web Components, Adwaita Sans fonts, symbolic icons
• 8 integration test suites — webtorrent, socket.io, streamx, Autobahn (RFC 6455 fuzzing), mcp-typescript-sdk, mcp-inspector-cli, axios, worker-stress
• Flatpak toolchain — gjsify flatpak init scaffolds manifest + MetaInfo + .desktop + flathub.json from one config block; gjsify flatpak check runs Flathub linters locally
• Node-free CLI bootstrap — curl … install.mjs | gjs -m - installs @gjsify/cli without npm/Node; gjsify self-update / gjsify uninstall -g round out the lifecycle
• ESM-only, TypeScript-first, Rolldown-based build system
• Native GNOME library bindings: Gio for I/O, Soup 3.0 for HTTP, GLib for crypto/process, Cairo for 2D, GTK 4 for UI, GStreamer for media + WebRTC, libgda for SQLite, Manette for gamepads, WebKit for iframes, nghttp2 for native HTTP/2
• Every unit test runs on both Node.js and GJS

Quick Start

Install the CLI

Node-free bootstrap (recommended, requires only gjs ≥ 1.86 and curl):

curl -fsSL https://github.com/gjsify/gjsify/releases/latest/download/install.mjs \
  -o /tmp/g.mjs && gjs -m /tmp/g.mjs && rm /tmp/g.mjs

This lays down @gjsify/cli under ~/.local/share/gjsify/global/ and a launcher at ~/.local/bin/gjsify — no npm / node required on the machine. Run gjsify self-update to refresh in place, or gjsify uninstall -g @gjsify/cli to remove.

Optional Node-managed install (escape hatch — only needed if you already manage CLIs through Node and want to install @gjsify/cli from npm):

gjsify install -g @gjsify/cli   # once the CLI is bootstrapped
# or, from a Node-only machine:
npm install -g @gjsify/cli

Create a new project

gjsify create my-app
cd my-app
gjsify install --immutable
gjsify build
gjsify run start

gjsify create scaffolds a GTK 4 application with TypeScript, ready to build and run. gjsify install resolves and installs npm dependencies via the committed Node-free dist/cli.gjs.mjs bundle — no npm / yarn invocation required. Pass --immutable for reproducible CI installs (gjsify-lock.json must match package.json).

Prerequisites

The runtime requirement is GJS ≥ 1.86 (SpiderMonkey 140 / ES2024, ships with Fedora 43+ and Ubuntu 25.10+). Plus GNOME development libraries for the features you plan to use:

Fedora:

sudo dnf install gjs glib2-devel gobject-introspection-devel gtk4-devel \
  libsoup3-devel webkitgtk6.0-devel libadwaita-devel gdk-pixbuf2-devel \
  libepoxy-devel libgda libgda-sqlite meson vala gcc pkgconf

Ubuntu:

sudo apt install gjs libglib2.0-dev libgirepository1.0-dev libgtk-4-dev \
  libsoup-3.0-dev libwebkitgtk-6.0-dev libadwaita-1-dev libgdk-pixbuf-2.0-dev \
  libepoxy-dev libgda-6.0-dev meson valac gcc pkg-config

Node.js 24+ is optional — needed only if you run the legacy test:node cross-validation suites (every unit test is mirrored on Node + GJS) or if you prefer to manage @gjsify/cli via npm install -g.

Using the CLI directly

# Build a TypeScript file for GJS (default target)
gjsify build src/index.ts --outfile dist/app.js

# Run it (sets LD_LIBRARY_PATH + GI_TYPELIB_PATH for native @gjsify/* prebuilds)
gjsify run dist/app.js

# Try a published GJS app without installing it
gjsify dlx <pkg>

Ship your own GJS app with a one-line installer

gjsify generate-installer scaffolds an install.mjs for your package, parameterised to your npm name and bin name:

cd my-gjs-app
gjsify generate-installer
git add install.mjs && git commit -m "chore: add gjsify-based installer"

Users of your app then install with:

curl -fsSL https://github.com/<you>/<repo>/raw/main/install.mjs \
  -o /tmp/i.mjs && gjs -m /tmp/i.mjs && rm /tmp/i.mjs

No npm / Node required on the user's machine.

Ship as a Flatpak

gjsify flatpak init scaffolds the full Flathub asset set — manifest + MetaInfo XML + .desktop + flathub.json — from one package.json config block. --kind app (default) for GTK/Adwaita desktop apps; --kind cli for headless tools.

gjsify flatpak init               # generate everything
gjsify flatpak check              # run appstreamcli + flatpak-builder-lint locally
gjsify flatpak build              # wrap flatpak-builder

See the Flatpak app guide and Flatpak CLI guide for end-to-end submission.

Usage

Write standard Node.js code — the bundler resolves node:* imports to @gjsify/* implementations when targeting GJS:

import { readFileSync, writeFileSync } from 'node:fs';
import { join } from 'node:path';
import { createHash } from 'node:crypto';

const content = readFileSync('/etc/hostname', 'utf8');
const hash = createHash('sha256').update(content).digest('hex');

writeFileSync(join('/tmp', 'hostname-hash.txt'), hash);
console.log(`Hostname hash: ${hash}`);

Web APIs work too:

const response = await fetch('https://api.github.com/zen');
const text = await response.text();
console.log(text);

Versioning & compatibility

All @gjsify/* packages ship as one coherent release train: every release publishes the whole set at a single version, tested against each other at exactly that version. Compatibility between @gjsify/* packages is guaranteed only within the same release version — mixing versions (e.g. @gjsify/fetch@0.14.x with @gjsify/http@0.13.x) is unsupported. Upgrade them together:

gjsify upgrade --latest --filter @gjsify   # bump every @gjsify/* dep to the latest train
gjsify upgrade --align                     # monorepos: re-align deps drifted across workspaces
gjsify upgrade --check                     # CI gate: fail on drifted ranges

Full rationale: ADR 0008 — Release-train versioning policy.

Package Status

Node.js Modules

Status	Packages
Full (36)	assert, async_hooks, buffer, child_process, console, constants, crypto, dgram, diagnostics_channel, dns, events, fs, globals, http, http2, https, module, net, os, path, perf_hooks, process, querystring, readline, stream, string_decoder, sys, timers, tls, tty, url, util, zlib + native: terminal-native, sab-native
Partial (5)	sqlite (libgda-backed subset), ws (no perMessageDeflate/ping-pong events), worker_threads (subprocess-based + cross-process SAB via sab-native), vm (eval-based, no realm isolation), v8 (stub)
Stub (3)	cluster, domain, inspector

Plus @gjsify/node-polyfills meta package for scaffolding.

Web APIs

abort-controller, compression-streams, dom-events, dom-exception, domparser, eventsource, fetch, formdata, gamepad, web-globals, web-streams, webaudio, webcrypto, webrtc (+ webrtc-native Vala prebuild), websocket, webstorage, xmlhttprequest. Plus @gjsify/web-polyfills meta.

Adwaita for browser targets: adwaita-web, adwaita-fonts, adwaita-icons.

DOM / Bridges

Package	Backed by	Provides
canvas2d-core	Cairo, PangoCairo	Headless CanvasRenderingContext2D, CanvasGradient, CanvasPattern, Path2D, ImageData
canvas2d	canvas2d-core, Gtk 4	Re-exports canvas2d-core + FontFace + Canvas2DBridge → Gtk.DrawingArea
dom-elements	GdkPixbuf, canvas2d-core	Node, Element, HTMLCanvasElement (auto-registers '2d'), HTMLImageElement, Document
event-bridge	GTK 4, Gdk 4	GTK → DOM event mapping (Mouse, Pointer, Keyboard, Wheel, Focus)
iframe	WebKit 6.0	HTMLIFrameElement, IFrameBridge → WebKit.WebView
video	Gst 1.0, Gtk 4	HTMLVideoElement, VideoBridge → Gtk.Picture (gtk4paintablesink)
webgl	gwebgl (Vala)	WebGL 1.0/2.0, WebGLBridge → Gtk.GLArea
bridge-types	—	Shared BridgeEnvironment / BridgeWindow interfaces

GNOME Library Mappings

Node.js / Web / DOM	GNOME
fs	Gio.File, Gio.FileIOStream
net	Gio.SocketClient, Gio.SocketService
http/https	Soup.Server, Soup.Session
crypto	GLib.Checksum, GLib.Hmac
child_process	Gio.Subprocess
dns	Gio.Resolver
tls	Gio.TlsClientConnection
url	GLib.Uri
process	GLib (env, pid, cwd)
sqlite	Gda (SQLite provider)
fetch / XMLHttpRequest / WebSocket / EventSource	Soup 3.0
WebRTC	GStreamer (webrtcbin) + @gjsify/webrtc-native Vala bridges
WebAudio	GStreamer (decodebin, appsrc, volume, autoaudiosink)
Video	Gtk.Picture + gtk4paintablesink (GStreamer)
Canvas 2D	Cairo + PangoCairo
WebGL	Gtk.GLArea + libepoxy via gwebgl Vala
Iframe	WebKit.WebView
Gamepad	libmanette

Project Structure

packages/
  node/       # 42 Node.js API packages (@gjsify/<name>) + node-polyfills meta
  web/        # 19 Web API packages (fetch, XHR, WebSocket, WebRTC, WebAudio, …) + web-polyfills meta
  dom/        # 8 DOM / bridge packages (canvas2d-core, canvas2d, webgl, dom-elements, event-bridge, iframe, video, bridge-types)
  gjs/        # GJS utilities, types, test framework (@gjsify/unit)
  infra/      # Build tools, Rolldown / Vite plugins, CLI, create-app
examples/
  dom/        # DOM-pillar examples (WebGL tutorials, WebRTC, WebTorrent, three.js, canvas2d, video, iframe, gamepad)
  node/       # Node-pillar examples (Express, Hono, Koa, socket.io, SSE chat, WS chat, Deepkit, CLI tools)
showcases/
  dom/        # Polished DOM showcases consumed by `gjsify showcase`
  node/       # Polished Node showcases
tests/
  e2e/        # End-to-end build/test runner
  integration/ # Curated upstream test suites (webtorrent, socket.io, streamx, Autobahn)
refs/         # 59 read-only reference submodules (Node.js, Deno, Bun, WebKit, GStreamer, …)

Development

# Install dependencies (workspace-wide, reproducible from gjsify-lock.json)
gjsify install --immutable

# Full build (every workspace package, in topological order)
gjsify foreach -A -t build

# Type check (all packages, parallel)
gjsify check

# Run all unit tests (every package's src/test.mts on GJS + Node, aggregated)
gjsify foreach -A test

# Run opt-in integration suites (webtorrent, socket.io, streamx, Autobahn)
gjsify workspace @gjsify/integration-webtorrent test
gjsify workspace @gjsify/integration-socket.io test
gjsify workspace @gjsify/integration-streamx test
gjsify workspace @gjsify/integration-autobahn test

# Per-package testing
cd packages/node/fs
gjsify test                # Build + run src/test.mts on GJS and Node, aggregate
gjsify test --runtime gjs  # Only the GJS run
gjsify test --runtime node # Only the Node run (test-correctness validation)

gjsify test replaces the per-package build:test:{gjs,node} + test:{gjs,node} script boilerplate: it locates src/test.mts, builds it in-process for each requested runtime, runs each output, and aggregates exit codes. Add --rebuild to force a rebuild or --no-build to run an already-built bundle.

Testing Philosophy

Every test runs on both Node.js and GJS. Node.js validates test correctness; GJS validates the implementation. Tests use @gjsify/unit (describe/it/expect). Node.js is therefore required for development of the polyfills themselves, but not for downstream consumers — they only need GJS.

Target Environment

• GJS 1.86+ (SpiderMonkey 140 / ES2024) — runtime
• Node.js 24.x — optional, only for the cross-validation test:node track
• Rolldown target: firefox140
• ESM-only, TypeScript 6.x

License

See individual package licenses. Most packages are MIT.