Kio language support
Kio is an ultra-portable, embeddable programming language that compiles to host languages — write a package once and run it in any of them. This extension adds Kio support to VS Code and compatible editors.
Language-server features also work in browser-based remote workspaces, such as GitHub Codespaces.
Features
- Syntax highlighting out of the box — a fast TextMate baseline, refined by a tree-sitter overlay for parser-accurate tokens.
- Inline diagnostics — precise type, parse, and elaboration errors with source context, right in your editor, from the
kio language server.
- Quick fixes and refactoring — built-in code actions from the Kio language server.
Requirements
Diagnostics, quick fixes, refactoring and formatting require the kio binary.
On macOS / Linux:
curl -fsSL https://jdevuyst.github.io/kio/install.sh | sh
On Windows (PowerShell):
irm https://jdevuyst.github.io/kio/install.ps1 | iex
The extension finds it via the kio.server.path setting, then KIO_BIN, then your PATH. Without it, the extension runs in highlighting-only mode.
Settings
Open the Command Palette and choose Preferences: Open User Settings (JSON) to edit settings.json. For project-specific settings, choose Preferences: Open Workspace Settings (JSON) instead.
The extension provides these settings:
kio.server.path — path to the kio binary.kio.trace.server — LSP trace verbosity (off / messages / verbose).
To format Kio files automatically when saving, merge the following into settings.json. Keep your other settings; if "[kio]" already exists, add the two entries to that section.
{
"[kio]": {
"editor.defaultFormatter": "kio-lang.kio",
"editor.formatOnSave": true
}
}
License
Dual-licensed under MIT or Apache-2.0.
