Simon Klee
32d67005d0
bufferDrawText and drawBox titles allocated a new Uint8Array through TextEncoder.encode on every call. Text now encodes into a reused scratch buffer with encodeInto. A UTF-16 code unit encodes to at most three bytes, so text that fits a third of the scratch never overflows it, and longer text allocates as before. Text still converts as TextEncoder.encode converted it: undefined draws nothing and other values use ToString. Both box titles convert before either encodes, so a title whose toString draws cannot overwrite the other title's bytes. On Node, a 10-character drawText drops from 9,859 to 6,012 user-space instructions and a box with two titles from 28,849 to 22,154. On Bun, where encode was already cheap, short text drops about 5%.
OpenTUI is a library to build terminal user interfaces.
- It is written in Zig.
- You write TypeScript directly or through React and Solid.
- You arrange boxes and text with flexbox.
- You add selects, inputs, and scroll boxes with keyboard and mouse controls.
- You can play sounds, show images, and render 3D graphics.
OpenCode uses OpenTUI in production for millions of users.
Website | Documentation | Packages
Packages
@opentui/core- Native terminal UI library with TypeScript bindings.@opentui/react- React renderer for building terminal user interfaces with OpenTUI Core.@opentui/solid- Solid renderer for building terminal user interfaces with OpenTUI Core.@opentui/keymap- Key binding and command routing library for terminal and browser applications.@opentui/qrcode- QR code encoder and renderable with React and Solid surfaces.@opentui/three- Three.js WebGPU renderer for OpenTUI.@opentui/ssh- SSH server integration for OpenTUI applications.
Private packages
@opentui/native- Private workspace with the Zig implementation, native tests, and benchmarks.@opentui/examples- Private workspace with example applications and a standalone examples executable.@opentui/web- Private workspace with the documentation website and the AI agent skill.
AI agent skill
Install the OpenTUI documentation as a skill for your AI coding assistant with npx skills:
npx skills add anomalyco/opentui --skill opentui
Add -g to install the skill globally.
Development
Development requires Bun 1.4.1 or later and Zig 0.16.0.
See AGENTS.md for engineering, tooling, and verification conventions.
bun install
Run package scripts from their package directory. Run bun run build from the repository root after you change
native code or cross-package build outputs. Ordinary TypeScript changes do not require a root build.
Run repository tests and static checks from the repository root:
bun run test
bun run fmt:check
bun run lint
To link the source packages into a Bun-managed project, install that project's dependencies, then run
./scripts/link-opentui-dev.sh /path/to/project from the repository root. Add --react or --solid when needed.
Contributing
OpenTUI is open for contributions.
License
OpenTUI is licensed under the MIT License.