JAML Language Support for VS Code

JAML (Jimbo's Ante Markup Language) and Jummy in the editor: highlighting, diagnostics, completion, snippets, and schema-backed validation. This extension is language tooling only — it does not run seed searches or bundle the WASM engine.

Requires: VS Code ≥ 1.97 and the YAML extension (schema validation for .jaml / .jummy).

Features

Syntax highlighting — TextMate grammar for JAML and Jummy
LSP diagnostics — Validation and errors in the editor
Completion — JAML root keys and clause types
Snippets — Common filter boilerplate

Installation

Marketplace: jaml-language-support

Manual VSIX:

code --install-extension jaml-language-support-1.2.0.vsix

Usage

Open or create .jaml or .jummy files. Use the schema for structure and the language server for feedback.

JAML syntax

id: my_filter
name: "My Balatro Search"
author: "Your Name"
deck: Red
stake: Gold

must:
  - joker: Blueprint
    stickers: [Eternal]
  - boss: The Psychic

should:
  - joker: Brainstorm
    score: 50

Full reference: jaml.schema.json.

Jummy (shorthand)

Eternal Blueprint in Ante 1
The Psychic boss

Running searches

Use Motely (CLI, site, or any tool that consumes motely-wasm / your own runner). This extension does not execute searches.

Settings

None required.

For maintainers

Schema: Canonical file is repo-root jaml.schema.json. esbuild.mjs copies it into this folder for Red Hat YAML (./jaml.schema.json). The npm package jaml-schema is only for external consumers of the schema on npm, not for this extension.
Build (matches VS Code bundling guidance): pnpm run compile — tsc --noEmit on the extension + LSP server, then esbuild (source maps, no minify). pnpm run watch rebuilds on change (esbuild only). After a clean that removed core/dist, run pnpm --filter @motely/jaml-language-core run build first (or pnpm -r build under tools/jaml-language).
VSIX: vsce package runs vscode:prepublish first (check-types + production esbuild: minified, no source maps). --no-dependencies is required with this pnpm workspace because vsce’s npm list check does not match pnpm’s layout; runtime deps are bundled into dist/*.js.
Marketplace VSIX: run package-vscode-extension.ps1 at repo root, then pnpm install and pnpm --filter ./vscode-extension run package.

Contributing

MotelyJAML on GitHub

License

MIT

Jimbo's Ante Markup Language

pifreak