FrontierJS — VS Code Extension

Language support for FrontierJS projects.

Litestone (.lite, .litestone)

Full language server for Litestone schema files:

• Syntax highlighting — models, enums, functions, attributes, types, {field} references
• Diagnostics — parse errors and validation warnings as you type
• Completions — field types, @attributes, @@model-attributes, @funcName(fieldArg) calls, model/enum names
• Hover — attribute docs, type docs, model/enum/function signatures on hover
• Go-to-definition — jump from a model reference to its declaration, from @funcName to the function block
• Formatting — aligned field columns, normalised spacing (Format Document or format on save)

Quick start

// schema.lite

enum Plan { starter  pro  enterprise }

function slug(text: String): String {
  @@expr("lower(replace({text}, ' ', '-'))")
}

model Account {
  id        Int  @id
  name      String
  slug      String     @slug(name)
  plan      Plan     @default(starter)
  createdAt DateTime @default(now())
}

Errors appear as red squiggles. Hover over any type or attribute for documentation. Ctrl+Space for completions. Shift+Alt+F to format.

MESA

Syntax highlighting, snippets, language configuration, hover documentation, completions ($, {, :, |, <) and the outline panel are active for .mesa files.

Diagnostics need the Mesa compiler, which is your workspace's own rather than a copy shipped here — the extension resolves @frontierjs/mesa from node_modules, from a packages/mesa above the file you are editing, or from mesa.compilerPath. Without it the other four features still work and the extension says so once.

Extension settings

Development

npm install
npm run watch   # watch mode

# Press F5 in VS Code to launch the Extension Development Host

To debug the language server: use the Extension + Server compound launch config.

npm test               # builds, then 88 assertions across three suites:
                       #   46  Litestone — the built server over real LSP/stdio
                       #   36  Mesa — the providers against a stubbed editor
                       #    6  Snippets — every `$` in every body
npm run package        # → vscode-frontierjs-<version>.vsix
npm run verify:package # packs, unpacks, and tests the .vsix itself