Language support for .typeflow mapping files — the VS Code counterpart of
apps/jetbrains-plugin, with the same three features and the same
architecture (no bundled compiler: everything semantic shells out to the
typeflow CLI).
Features
Syntax highlighting — declarative TextMate grammar
(syntaxes/typeflow.tmLanguage.json) mirroring the token classification of
the docs playground and the JetBrains lexer: keywords, property names,
function calls, primitive types, literals, $root/$parent/$.
Inline diagnostics — runs typeflow check --json on open and save and
maps the reported character-offset spans to squiggles (TF-codes appear as
the diagnostic code). Open/save only by design: the CLI reads the file from
disk, so per-keystroke checks would diagnose stale content.
Completion — declaration keywords and literals as bare words; after a
., the member chain typed so far (user.contact., user.labels[0].) is
walked through the input declaration's resolved type (from the same CLI
call) to offer actual field names with their types.
Requirements
The typeflow CLI must be resolvable from the workspace (a local
node_modules/.bin, a global install, or any PATH shim). Point the
typeflow.path setting at a specific binary if needed.
Build
Requires Bun.
bun install # dev types only (@types/vscode, typescript)
bun run build # bundle src/extension.ts -> dist/extension.js (CJS)
bun run package # build + `vsce package` -> typeflow-<version>.vsix
To develop: open this folder in VS Code and press F5 (Run Extension).
